1157 results about "Volumetric flask" patented technology

The invention discloses facility for automatically collecting waste liquid in volumetric flasks. The technical scheme of the facility includes that the facility for automatically collecting waste liquid comprises a fixing device, a power transmission device, a single-shaft robot, a transportation device and a rotary fixture. A container containing waste liquid is arranged on the fixing device, the fixing device on a conveyor is driven by a motor to be conveyed to an operation table, a cover of the container is unscrewed and placed in a cover collecting disc by a manipulator, the fixing device is transported to the rotary fixture above a waste liquid collecting barrel by a sucker, is fixed in a fixed sleeve, is turned and shaken by a rotating cylinder so that the waste liquid can be poured out, and finally is transported to the conveyor to be moved out of the operation table. The facility for automatically collecting waste liquid is simple in structure, convenient to operate, labor-saving, material-resource-saving, time-saving, safe, quick, high-efficient and automatic. Frequent working procedures are avoided.

The invention discloses a method that can simultaneously analyze various elements, aims at solving the defects that currently the analysis of various elements cannot be finished at one time, and consequently the analysis time is long and the reagent usage is large, and discloses a method that can simultaneously measure the elements of silicon, aluminum, calcium and barium and comprises the following steps: a test sample is preprocessed through the acid dissolution method, microwave-digested, naturally cooled, and then placed into a volumetric flask with scales, diluted and shaken until well distributed, a solution with a standard working curve is prepared, an atomic emission spectrograph of inductance coupled plasmas is started and led to reach the measurement requirement, a plasma torch is lighted, the relative standard deviation of the plasma torch is led to be less than 5 percent, wavelength of each element is chosen, the working curves are plotted, and the content of each element is computed. The method combines the microwave digesting sample dissolution technique with the atomic emission spectrograph of inductance coupled plasmas, can simultaneously analyze nine elements including silicon, etc., is accurate and quick, has greatly reduced reagent usage, and reduces the environmental pollution that is caused by chemical reagents.

The invention discloses a method used for measuring the calcium element in a silicon, aluminum, calcium and barium alloy, which comprises the following steps: a test sample is placed in a beaker, and deionized water is added until the test sample is wet; 9.5 to 10.5 millimeter of nitric acid is added; 1 to 2 millimeter of hydrofluoric acid is titrated; the mixture solution is heated until completely dissolved; perchloric acid is added; the mixture solution is heated until the sample volume is reduced to 1 to 2 millimeter; the mixture solution is naturally cooled; the perchloric acid is further added, and the mixture solution is heated until the sample volume is reduced to 1 to 2 millimeter; the hydrochloric acid and the deionized water are further added; the mixture solution is heated until all salts are dissolved, and the mixture solution is naturally cooled until the temperature is lower than 40 DEG C; the test sample is placed into a volumetric flask with scales and diluted with the deionized water; a mother solution is placed into a trigonal cup, the deionized water, trolamine (1 added by 1), lemery, bitter salt and an calcon-carboxylic acid are added, and the mother solution is adjusted to be red with potassium hydroxide; the potassium hydroxide is further added; EDTA is titrated until an end point that the mother solution becomes blue; and an analyzing result is computed. The method does not need precipitation separation and filtration, and has the acute end point without intermediate color and improved measuring accuracy.

The invention discloses a method for determining content of potassium, sodium, calcium and magnesium in cigarette paper simultaneously, which includes the following steps: cutting 100+ / -0.1 mg of a cigarette paper sample, using 100mL of 0.02mol / L hydrochloric acid as an extracting agent, ultrasonic-extracting for 18-22min to obtain extract liquor, selecting 5.0mL of the extract liquor to a 25mL volumetric flask, bringing to the volume with 0.02mol / L hydrochloric acid to obtain diluent, and filtering the diluent through a 0.45 mu m filtering film to obtain sample liquid to be detected; selecting sodium chloride, potassium chloride, hexahydrate magnesium chloride and anhydrous calcium chloride, using pure water as solvent, preparing mixed standard solution through gradual diluting, and adding 0.02mol / L hydrochloric acid to prepare series standard working solution; detecting and analyzing the series working solution and the sample liquid to be detected respectively through an ion chromatographic instrument; and drawing a standard curve and calculating results. The method is fast and simple to operate, high in sensitivity, low in detection limit, good in recovery rate, and suitable for batch analyzing of important inorganic elements in the cigarette paper.

The invention relates to detection technology for element contents, and provides a method for simultaneously determining contents of arsenic, cadmium, lead, vanadium, zinc, manganese and phosphor in soil or deposits. The method mainly comprises the following steps: (1) 0.1g of a grinded drying soil sample is accurately weighed and placed in a TFM microwave digestion pot, a certain proportion of aqua regia and hydrofluoric acid are added, and a solution is allowed to stand; (2) an appropriate microwave digestion program is set, and microwave digestion is carried out for the solution in the step (1); (3) after the microwave digestion program ends, an acid-driving device is used for heating and evaporating the digestion solution in the step (2) to a dry state, and total transfer, volumetric flask preparation, and filtering are carried out; (4) ICP-OES is used for determining contents of arsenic, cadmium, lead, vanadium, zinc, manganese and phosphor in the clear liquor in the step (3); (5) ICP-MS is used for determining contents of elements in the clear liquor in the step (3) which do not reach detection limits in the step (4) once more. The method has the advantages of simple steps, simplified operation, saved soil samples, reduced personal error, minimized environment interference, and improved working environments.

The invention provides a method for detecting the silicon content in a vanadium-aluminum alloy. The method comprises the steps of: establishing a silicon standard solution concentration-absorbance working curve; decomposing a sample to be detected with hydrochloric acid and nitric acid; adding sodium sulfite into the obtained solution to be detected so as to reduce the solution to blue, conducting cooling, and setting the constant volume of the solution in a standard volumetric flask; getting two solutions of certain amount from the standard volumetric flask for detecting, with one solution used as a color developing solution and the other solution used as a reference solution; adjusting the color developing solution to chromogenic acidity, adding excess ammonium molybdate, and disposing the solution for 5-30min so as to generate silicomolybdenum yellow heteropoly acid, then adding a mixed acid of oxalic acid and sulfuric acid, and adding ammonium ferrous sulfate immediately to reduce the silicomolybdenum yellow heteropoly acid generated during reaction to silicomolybdenum blue heteropoly acid, and carrying out dilution to a scale; adjusting the reference solution to chromogenic acidity, adding a mixed acid of oxalic acid and sulfuric acid, ammonium molybdate and ammonium ferrous sulfate, and carrying out dilution to the scale; measuring absorbance at a position of 680nm at a spectrophotometer, looking up the working curve according to the obtained absorbance value of the color developing solution, and calculating the silicon content in the vanadium-aluminum alloy.

The invention relates to an analysis method for transformer oil. A measuring method for the furfural content of transformer oil comprises: a step of preparation of furfural standard oil, a step of preparation of a standard sample and a sample, and a step of sample analysis. The step of the preparation of the furfural standard oil comprises 1) preparation of a general solution: weighing 0.01g-0.03g standard material 2-furfural, placing in a brown volumetric flask, fully dissolving and diluting to the mark with new oil containing no furfural to obtain a furfural general solution with a certain concentration which is stored away from light for two days for use; 2) preparation of the standard solution: diluting one equal part of general solution with a certain amount of new oil containing no furfural to prepare a standard solution of a desired concentration, wherein the desired concentration includes 0.5 mg / kg, 1.0 mg / kg, 5.0 mg / kg and 10.0 mg / kg, and the standard solution is stored away from light and in brown reagent bottle. The method provided by the invention has the characteristics of low toxicity, and convenient operating, and can meet the production requirements.

The invention discloses a fast and accurate detection method for silicon dioxide content in limestone, kalk and dolomite. The detection method comprises the following steps: crushing samples, and drying for 1.5-2.5 h under thea temperature of 105-110 DEG C; mixing 0.1000 g samples and 3.0-4.0 g mixed fluxing agent of sodium carbonate and boric acid evenly, liquating for 18-20 min under athe temperature of 890-910 DEG C, dissolving frits by a 45-55 ml hydrochloric acid and 25-35 ml water, and placing the test solution in a 250-ml volumetric flask; taking and adding 5.00 ml test solution in a 100-ml volumetric flask, adding 18-22 ml ammonium molybdate and still standing for 18-22 min, and adding 45-55 ml mixed acid of oxalic acid and sulfuric acid, 4.80-5.20 ml ascorbic acid-ammonium ferrous sulfate mixed solution; measuring the absorbency of a color development solution at the wavelength of 680 nm through a spectrophotometer, and using blank as a reference; preparing a silicon dioxide standard sample with the concentration of 40 ug / ml, moving and taking 0.00 ml, 2.00 ml, 4.00ml, 6.00 ml, 8.00 ml and 10.00 ml silicon dioxide standard samples, and placing the standard samples in 100-ml volumetric flasks respectively, adding 5.00 ml blank test solution in the volumetric flasks respectively, after color-developing, measuring the absorbency at the same conditions, and then drawing a working curve. The silicon dioxide content in the samples is calculated according to the following formula (shown in the specification). The detection method is fast and efficient, excellent in accuracy, reproducibility and stability, and particularly suitable for detection of samples with silicon dioxide content equal to or higher than 4 %.

The method for massively preparing hollow carbon nano cage includes the following steps: firstly, preparing solid carbon nano cage: uniformly mixing metal carbonyls liquid and low-carbons organic liquid according to a certain mixing ratio to obtain reaction solution and placing it into a volumetric flask; heating main reactor, introducing inert gas, then making the reaction solution be passed through an electronic peristaltic pump and injected into the volumetric flask by means of injector positioned in the end portion of main reactor so as to obtain solid carbon nano cage wrapped with metal particles from tail portion product collector of main reactor; then preparing hollow carbon nano cage: making the obtained solid carbon nano cage undergo the process of air oxidation treatment, then placing it in pure hydrochloric acid or pure hydrochloric acid and distilled water mixed solution and making ultrasonic oscillation, flushing the mixture obtained after ultrasonic oscillation with deionized water, filtering until the solution is neutrality or approaching to neutrality, standing still to make the solid matter be deposited and removing upper portion liquid, drying so as to obtain the invented hollow carbon nano cage.

The present invention discloses a method for preparing a standard gas and used apparatus. The technical plan is as follows: a volumetric flask is connected to a gasholder through a pipe equipped with a valve, a gas sampling bag is connected to the gasholder through a pipe equipped with a valve. During preparing a standard gas, at ambient pressure, liquid is added into the volumetric flask capable of measuring and getting liquid accurately, and a certain amount of liquid is accurately added into the gasholder filled with a solvent gas and connected to the gas sampling bag, wherein escaping the solvent gas during the liquid adding-into course in collected to the bag sampling bag, with the volume of the solvent gas collected being equal to that of liquid flowing into the gasholder. Said gas distribution apparatus in accordance with the present invention is operated conveniently, is easy to master, is assembled simply and cheaply, has high gas distribution precision and accuracy (RSD<=0.64%) superior to that of sample analysis by a gas chromatography. Therefore, it is convenient for extending said apparatus in common labs, which is capable of satisfying quality inspection analysis requirements of labs who perform gas and atmosphere analysis and have gas chromatography instruments.

The invention relates to a measurement method of the phosphorous content in an iron ore, in particular to a method for measuring the phosphorous content by adopting a bismuth phosphomolybdate blue-sulfuric acid photometry. The method comprises the following steps of: weighing 0.25g of sample and putting into a platinum crucible containing about 2g of mixed fusing agent, putting in a muffle furnace with the temperature of 100 DEG C, fusing for 10min and taking out; cleaning the exterior of the platinum crucible, then putting the platinum crucible into a beaker containing about 80ml of hot water, adding 320ml of concentrated HNO on an electric furnace, heating at low temperature and dissolving, leaching the crucible out, taking the beaker out, cooling, then transferring into a 250ml volumetric flask, diluting to a scale and shaking up for later use; sucking 25ml of mother solution of a fusing sample in the platinum crucible, putting into a 50ml volumetric flask, adding 2.5ml of bismuth nitrate solution, 5ml of ammonium molybdate solution, 3ml of 8mol / L sulfuric acid solution and 5ml of ascorbic acid solution (prepared when needed), shaking up, carrying out color comparison at 750nm wavelength, measuring an absorbance value, and carrying out result conversion by using a guide sample with similar ingredients. The invention effectively solves the problem of instable absorbance value in a method for measuring the phosphorous content by adopting a traditional molybdenum blue spectrophotometry and ensures that the absorbance remains unchanged within two hours.

The invention discloses a pretreatment method for determining multiple heavy metal elements in soil simultaneously. The pretreatment method comprises steps as follows: step (1): sample weighing: the soil is air-dried, ground and screened with a nylon sieve, a soil sample is weighed and put into a microwave digestion tube through a polytetrafluoroethylene long-neck funnel, and the funnel is slightly flapped before the funnel is removed so that all the soil sample attached to the wall of the funnel enter the digestion tube; step (2): digestion: nitric acid, hydrochloric acid and hydrofluoric acid are added to the digestion tube, a cover is screwed down, and the digestion tube is put into a microwave digestion instrument for digestion; step (3): acid driving: after microwave digestion is finished, hydrogen peroxide is added to the digestion tube; then the microwave digestion tube is put into a temperature-controlling acid driver in a fume cupboard for direct acid driving until the volume is smaller than 1 mL, then a solution is directly transferred to a volumetric flask, the volume is constant, and a to-be-tested solution is obtained. With the adoption of the pretreatment method, the digestion speed of the sample can be increased, the pre-treatment step of the sample is simplified, and the accuracy of the detection analysis result is guaranteed.

The invention provides a continuous flow method for measuring total alkaloid in tobacco or tobacco products. In the method, potassium thiocyanate and sodium dichloro isocyanurate are adopted to carry out reactions to generate cyanogen chloride on line. The cyanogen chloride can carry out reactions with total alkaloid (calculated in the form of nicotine) in tobacco or tobacco products to break off the pyridine rings of nicotine, and then further carries out reactions with p-aminobenzene sulfonic acid. The reaction products are measured by a chromometer at 460 nm. The method uses a buffer system to control the pH value of the reaction system in a range of 6.0 to 7.5, and the buffer system is composed of a buffer solution A and a buffer solution B. The buffer solution A is prepared by the following steps: weighing disodium hydrogen phosphate and trisodium phosphate, placing the weighed substances in a beaker, dissolving the substances with water, transferring the solution to a volumetric flask (1L), and adding water into the volumetric flask until the water reaches the scale. The buffer solution B is prepared by the following steps: weighing p-aminobenzene sulfonic acid, disodium hydrogen phosphate, sodium dihydrogen phosphate, and sodium citrate, placing the weighed substances into a beaker, dissolving the substances with water, transferring the solution to a volumetric flask (1L), and then adding water into the volumetric flask until the water reaches the scale.

The invention discloses a pretreatment method for determining of heavy metal in soil. The pretreatment method includes the following steps that S1, 0.2-0.5 g of a sample is accurately weighed inside a digestion tank, and 8 ml of aqua regia is added for digestion; S2, according to the digestion process, temperature reaches 100 DEG C through 4 minutes of climbing at 1200 W to be kept for 3 minutes; temperature reaches 150 DEG C through 5 minutes of climbing at 1200 W to be kept for 5 minutes; temperature reaches 180 DEG C through 5 minutes of climbing at 1200 W to be kept for 25 minutes; S3, the digested sample obtained through S2 is transferred into a teflon crucible of 50 ml, 5 ml of nitric acid, 5 ml of hydrofluoric acid and 3ml of perchloric acid are added, a cover covers the teflon crucible, then the teflon crucible is placed on an electric hot plate to be heated for about 1 h at medium temperature, and finally the cover is opened; the temperature of the electric hot plate is controlled to be 150 DEG C-200 DEG C, heating is performed continuously to remove silicon, and when thick perchloric acid smoke or about 1 ml of solution remains through heating, the crucible is taken down to be slightly cooled; S4, after S3 is completed, 1 ml of hydrochloric acid is added, soluble residues are dissolved through warming, the total quantity of solution is transferred into a volumetric flask of 50 ml, the volume is metered to a marked line with water after cooling, and even shaking is performed. The pretreatment method has the advantages that the soil sample can be digested completely, and digestion speed can be increased.

The invention relates to a hydroxyl free radical testing method, in particular to a spectrophotometry for testing the hydroxyl free radical by using naphthyl diphenyl methane dye-victoria pure blue BO(C.I42595) as a chromogenic reagent. 8.0ml of 1.0 multiplied by10<-2>mol.L<-1> potassium iodide solution, 0.1ml of 1.0 multiplied by 10<-3> mol.L<-1> FeSO4, a tested object which can produce the hydroxyl free radical, 8.0ml of phosphoric acid-dihydric phosphate buffer solution with PH value of 2.0, and , 10.0 ml of 2.0*10<-4>mol.L<-1> of victoria pure blue BO aqueous solution with 0.5g.L<-1> of emulsifier OP are added sequentially into a volumetric flask with capacity of 50ml, then carries out the constant volume by distilled water, are evenly shaken, and stands for 15 minute, and then a 1cm colorimetric ware is taken as reference, the absorbency of the solution is tested at the distance of 571nm, and finally, a regression equation is obtained according to a standard curve: A is equal to 0.06C(mol.L<-1>) plus 0.002(r is equal to 0.9994, 0.0mg.L<-1> to 0.0082mol.L<-1>, wherein, A stands for absorbency; C stands for molar concentration of the hydroxyl free radical, i.e. molar concentration of hydrogen peroxide), and the concentration of hydroxyl free radical can be calculated. The method of the invention has the advantages of simple instruments, simple and convenient operation, high sensitivity and accurate analyzing result.

The invention relates to a fast analytical method of molybdenum in molybdenum concentrate, which comprises the following steps: weighed sample is added with nitric acid and potassium chlorate, heated and dissolved, and then is added with hydrochloric acid, heated, dissolved and evaporated after cooling down a little; after cooling down to room temperature, purging by adding water and heating are carried out so that the salt is completely dissolved; afterward, sodium hydroxide solution is added, heated and boiled, and then cooled down to room temperature before being immigrated into a volumetric flask, volume determining and filtering, after measuring a certain volume of filtrate and regulating pH value, a buffer solution with pH value of 5-7 is added, heated to slight boiling, and excessive plumbic titer with a fixed amount is added with constant stirring, heated, boiled and cooled down to room temperature; after that, the solution is immigrated into a volumetric flask, volume determined, let stand, filtered, and then lead content of the solution is measured by atomic absorption method. The analytical method has the advantages that the procedure is simple, the operation process is easy to control and easy to master, moreover, the measuring time is reduced to half of the gravimetric method, which is more suitable for analyzing and measuring flow sample, the result obtained has favorable accuracy and precision, and is accurate and reliable.

The invention relates to a method for detecting content of fructooligosaccharide in infant formula milk rice flour. The method comprises the following steps: accurately weighting a sample; placing the sample into a volumetric flask; adding hot water for dissolving; mixing uniformly; ultrasonically shaking; cooling to room temperature; accurately adding a potassium ferrocyanide solution and a zinc acetate solution, shaking and uniformly mixing, adding water for achieving a constant volume, and uniformly shaking; standing; filtering by using filter paper; accurately transferring supernate to the volumetric flask until constant volume is achieved by using acetonitrile; shaking and uniformly mixing; filtering through a 0.45 micron organic filter film; performing HPLC (High Performance Liquid Chromatography) measuring and quantifying according to an external standard method, namely, firstly, preparing a standard working solution and respectively injecting the standard working solution into the HPLC, measuring a corresponding peak area and drawing a standard curve, then injecting the prepared sample solution into the HPLC, measuring the corresponding peak area and quantifying the sample on the basis of the standard curve, thereby obtaining the concentration of the sample solution; and calculating the percentage of the content of fructooligosaccharide according to a formula. The method has the advantages of convenience, high speed, accuracy and the like.

The invention discloses a method for continuous determination of calcium oxide and magnesium oxide content of limestone and dolomite. The method comprises adding a limestone or dolomite sample into a Teflon plastic beaker, preparing a blank contrast without the limestone or dolomite sample, respectively adding hydrochloric acid and nitric acid-hydrofluoric acid into the beakers to dissolve the sample, adding perchloric acid into the beakers to produce smoke, adding hydrochloric acid into the breakers, carrying out salt heating dissolution, transferring the reagents into a big volumetric flask, carrying out dilution until the liquid level reaches to the scale and metered volume is obtained, dividing each solution in the sample and blank contrast into two parts with the same amount, orderly adding appropriate amounts of triethanolamine, water, hydroxylamine hydrochloride, a potassium hydroxide solution and calcein into one part in the sample and blank contrast, carrying out titration by an EDTA standard solution until the fluorescent green color disappears, recording the volume, calculating calcium oxide content, orderly adding appropriate amounts of triethanolamine, water, hydroxylamine hydrochloride, an ammonia-ammonium chloride buffer solution and an eriochrome black T indicator into the other part in the sample and blank contrast, carrying out titration by an EDTA standard solution until the prunosus color is changed into a blue color, recording the volume and calculating magnesium oxide content.

The invention relates to a method for using an atomic absorption spectrometry to detect the chromium ion content in the soil. The method has the specific steps that: firstly, the invention establishes a chromium standard concentration-absorbance curve, then, the soil sample is added with the distilled water for moisturization, after that, the concentrated sulfuric acid and the concentrated phosphoric acid are used for digestion, the heating is carried out till the soil sample emits the white smoke, then the concentrated nitric acid is added till a large amount of white smoke comes out and the soil sample turns white, and the digestion liquid turns yellow green; the digestion liquid is transferred to a standard volumetric flask, the pH value is regulated to 7, 1 percent of H2SO4 - 1 percent of Na2SO4 solution is added for dilution to a standard scale, the mixture is shaken evenly and placed still till the solution is clarified, the upper layer of clear solution is taken for the measurement of the absorbance under a wavelength of 213.9nm, and the chromium ion content in the soil sample can be obtained by comparison with the established standard curve in the step a. The measurement error of the chromium ion content in the soil sample which is measured by the method of the invention is within 3 percent.

The invention relates to a method for accurately determining calcium-based desulfurization agent main component. The method comprises the steps that: 1, a proper amount of a desulfurization agent sample is weighed, and is placed into a container bottle; a proper amount of a sucrose solution is added; the bottle is plugged and oscillated until completely decomposed; the material is filtered, such that a filtrate (1) and a precipitate (1) are obtained; 2, the precipitate (1) and the filtering paper are placed in a heating vessel; a proper amount of an acetic acid solution is added; the mixture is heated until the sample is completely dissolved; filtering is carried out, such that a filtrate (2) and a precipitate (2) are obtained; 3, the precipitate (2) and the filtering paper are added into the heating vessel; a proper amount of a mixed acid solution is added; the mixture is heated until the solution shows an earth yellow color; salt is dissolved, and heating is continued until the mixture is slightly boiling; the mixture is diluted and filtered, such that a filtrate (3) is obtained; 4, the filtrates are respectively transferred into volumetric flasks, and volumes are metered; two parts of proper amounts of the samples are fetched; and 5, combined with chemical analysis and thermal gravimetric analysis, true and valid calcium oxide content in the desulfurization agent can be determined, and the contents of calcium hydroxide and calcium carbonate which severely affecting desulfurization performance can be determined.

The invention discloses a method for detecting multiple fat-soluble vitamins in a feed. The method comprises the steps of (1) preparing multi-vitamin standard solution which comprises at least two of vitamin A acetate, vitamin D3 and vitamin E acetate according to the detection requirements, and detecting the standard solution by adopting an HPLC-MS / MS to obtain a standard curve equation; (2) weighing a sample to a brown volumetric flask, adding an extract solution for ultrasonic extraction for 10-30 minutes, cooling to constant volume, centrifuging, filtering and processing by adopting a 0.22micron of organic phase filter membrane and carrying out analytical test on a chromatographic parameter and a mass spectrum detection parameter same as those in the step (1); and (3) calculating the content of multiple vitamins in the sample according to the detection results in the steps (1) and (2). According to the method for detecting multiple fat-soluble vitamins in the compound feed at the same time, detection and analysis of multiple different vitamins are completed in one detection and analysis process.

The invention relates to a method for measuring chlorine ion in a copper-containing zinc electrolyte sample, which comprises the steps as follows: taking 20-50 mL of a zinc electrolyte sample, adding 5mL of 50% sulfuric acid, adding 0.5-1.0 g of zinc powder with purity of 99.999% or 0.2-0.5 g of aluminum powder with purity of 99.999%, stirring until reaction is finished, and diluting to 100 mL with a volumetric flask; carrying out dry filtering, adding 20-50 mL of filtrate to a 300 mL beaker, adding 5-6 mL of nitric acid, adding known amount of excessive silver nitrate (0.05 mol / L) until chlorine ion is precipitated completely, heating for boiling to precipitate and flocculate silver chloride, filtering, washing precipitate, adjusting the volume to 80-100 mL, adding 1 mL of saturated ferric sulfate solution acidified with nitric acid, titrating with 0.01 mol / L potassium thiocyanate solution until the stable red color appears in the solution, namely the end point of titration. According to the invention, the measuring method can be used for rapidly and accurately measuring chlorine ion content in the zinc electrolysis electrolyte without use of an instrument; and high-purity zinc powder or aluminum powder are adopted to remove interference metal ions, and the use amount of the reagents and the operation steps are strictly controlled, therefore, the method can be used for accurately measuring in situ and medium and small-sized laboratories.

The invention discloses a high performance liquid chromatography method for determination of benzalkonium chloride content in antiseptic wipes. The method comprises following steps: (1) weighting a sample of the antiseptic wipes; (2) taking acetonitrile-70 mmol / l ammonium acetate and glacial acetic acid as mobile phase; (3) adding the antiseptic wipe sample and 25 ml mobile phase into a separation column, extracting the sample with mobile phase for 15 min, performing vortex oscillation for 2 min and diluting the mobile phase, wherein a column temperature of the separation column is 40 DEG C, and a determining wavelength is 262 nm; and (4), after dilution, cooling and then transferring the sample into a 100 ml volumetric flask, diluting with mobile phase to 100 ml, and then analyzing. The benzalkonium chloride content is determined by an external standard method, and the benzalkonium chloride content of the antiseptic wipe sample is compared with that of a benzalkonium chloride standard solution.

The invention relates to a method for determining contents of copper, lead, zinc and cadmium in ionic type rare earth mineral slag. The method for determining the contents of copper, lead, zinc and cadmium in the ionic type rare earth mineral slag through microwave digestion-ICP-OES comprises the following steps: carrying out microwave digestion on an ionic type rare earth mineral slag sample through 8mL of lefort and 2mL of hydrofluoric acid; adding 2mL of HClO4 into a digestion tank and putting HClO4 in an acid repelling apparatus; repelling acid at 160 DEG C to ensure that HClO4 is nearly dried; cooling HClO4 and adding 5mL of HCl(1+1) to be transferred and fixing the volume into a 50mL of volumetric flask. A sample blank and the solution are formed aerosol through an inductively coupled plasma atomic emission spectrometer atomizer, and the aerosol is loaded into a high-temperature high-frequency plasma by argon gas, so that ionization is generated and characteristic spectrum is produced, the spectral line intensity of the copper, lead, zinc and cadmium elements in the sample blank and the solution are tested, and the strength of the various elements is in direct proportion to the contents of the elements; therefore, by using a calibration curve method, quantitative determination is carried out, and the contents of the copper, lead, zinc and cadmium elements in cosmetics arecalculated. The method has the characteristics of good determination stability, high sensitivity, and accurate results.

The invention discloses a method for determining the content of selenium in soil by adopting a microwave digestion-atomic fluorescence technology. The method comprises the following steps: weighing a soil sample, putting the soil sample in a microwave digestion pot, sequentially adding a proper amount of nitric acid and hydrofluoric acid, shaking up, allowing the obtained solution to stand for 0.5h, and carrying out microwave digestion; carrying out acid removal treatment after the digestion; transferring the sample to a volumetric flask, adding a proper amount of concentrated HNO3, adding a solvent to a constant volume, and allowing the obtained solution to stand for above 5h; taking the obtained sample to a sample tube, sequentially adding 1ml of 100g / L K3Fe(CN)6 and 4ml of concentrated HCl, heating in a 90DEG C water bath for 0.5h, cooling, and testing by adopting an atomic fluorescence spectrophotometer; and making a serial standard curve, and corresponding the tested data to the serial standard curve in order to obtain the content of selenium in soil. The method adopting effective pretreatment of soil, reasonable reagent proportioning and apparatus parameter setting overcomes the defects of traditional selenium content determination methods, solves the soil matrix interference problem in determination, and can be used to accurately determine the content of selenium in soil.

The invention discloses a method for quickly measuring sulfate radical content in a magnesium method desulfurization process. The method consists of the processes of filtration, constant volume determination, acidification, precipitation and back titration and comprises the following steps of: filtering a fetched sample by using filter paper; filling quantitative filtered clear solution with constant volume into a volumetric flask; filling proper constant volume clear solution in a beaker, and adding diluted hydrochloric acid of 1:1 concentration for acidifying; adding excessive barium chloride into the acidified clear solution to perform precipitation; filtering and fully washing the sediment, and titrating the total weight of barium, calcium and magnesium ions by using ethylene diamine tetraacetic acid (EDTA) coordination agent under the condition that chrome black T is used as an indicator; and meanwhile, calculating the content of the barium ions by measuring the total weight of the calcium and the magnesium so as to calculate the content of the sulfate radicals. The method has the advantages that: the control of solution concentration and measuring process conditions is accurate, the measurement of the content of the calcium and the magnesium is completed at the same time, and the preparation of barium and magnesium mixed solution is not needed; the accuracy of the sulfate radical detection is improved, and the detection time is shortened; and the method is suitable for quickly measuring the sulfate radical content in the debugging and operating process of a magnesium oxide method desulfurization system.

The invention discloses an on-line sample dilution and neutralization test device which consists of a dilution device, a neutralizer, an instruction control device, a silica gel pipe and a control line, wherein an ultrapure water storage bottle and a sample bottle are connected to a peristaltic pump, an injection pump, a three-way mixer, an electric two-position four-way valve, a three-way mixer and the neutralizer through the dilution silica gel pipe; a control box is connected with the peristaltic pump, the injection pump, the three-way mixer, the electric two-position four-way valve and the neutralizer through the control main line in a control manner; automatic sample dilution and sample neutralization are completed on line through a pipeline and a circuit; samples are provided for a chromatographic analysis system to complete analysis. According to the on-line sample dilution and neutralization test device, the problem caused by ion pollution of an existing neutralization method is effectively solved; no suction pipe or no volumetric flask is used in the whole neutralization process any more, so that the pollution source is reduced, a precise value of experimental data measurement is guaranteed, and a reliable test condition is provided for research on ion chromatographic analysis of snow and ice samples.

The invention discloses a method for measuring the content of residue acrylamide monomer in water treatment agent cationic polyacrylamide, and the method is realized through the following steps: firstly, immersing polymer ationic polyacrylamide in a mixed solvent (volume ratio 9 to 1) formed by ethanol and water for 24 hours, transferring supernatant fluid into a volumetric flask, replenishing a certain amount of ethanol and water to enable the volume ratio of ethanol to water to be 1 to 1, and performing the isochoric process by mixed liquid. The absorbance A of to-be-measured solution is measured at a position with 205nm wavelength through the ultraviolet spectrophotometry, and the content of acrylamide in the to-be-measured solution can be calculated according to a preliminary drawn acrylamide standard sample standard curve. According to the invention, the recovery rate of measured material achieves more than 85%, and the method has the advantages of simple operation, excellent reproducibility, cheap and non-toxic solvent, low measurement cost and the like, thereby being applicable to quality inspection by manufacturing enterprises, use and application divisions and quality inspection divisions.

The invention discloses an abnormal binding belt for connecting a cork with a bottle and suitable for a glass reagent bottle with a cork. The abnormal binding belt is made of flexible erosion-resistant plastic or rubber and comprises two linear binding belts. The linear binding belts are connected in parallel through a connection strip to form a whole. One ends of the linear binding belts are provided with locking bayonets and the connection strip is connected on locking bayonet ends of the two binding strips. A marking portion is connected to one side of the connection strip. The abnormal binding belt for connecting the cork with the bottle and suitable for the glass reagent bottle with the cork can be conveniently applied to solution preparation occasions of ground glass volumetric containers with corks, wherein the containers include a volumetric flask and a separating funnel, the binding belt is convenient to bind, and the tightening degree is high. The cork will not be separated from the bottle body. A mark writing position is arranged in a middle connection position of the abnormal binding belt so as to distinguish volumetric flasks. As the bottle body is scraped due to loss of the cork in practice, convenient and normative marking positions are provided by the abnormal binding belt for connecting the cork with the bottle and suitable for the glass reagent bottle with the cork.