34results about How to "Satisfactory recovery rate" patented technology

A method for determining content of triamcinolone acetonide acetate and micronazole nitrate in qumixing emulsifiable paste utilizes high efficiency liquid plase external standard method to determine simultaneously out content of triamcinolone acetonide acetate and miconazole nitrate in qumixing emulsifiable paste.

The invention discloses an experiment on the assumption that indium (In) and tin (Sn) are separated from the hydrochloric acid (HCl) leaching solution of ITO (indium tin oxide) in a distillation manner and confirms that the optimum condition of distillation is to distill at 130 DEG C for 6h. According to the results, the satisfying indium / tin separation effect and indium recovery rate can be achieved by adopting the open-type distillation under the optimum condition of distillation.

The invention provides a method for separation and determination of chromium elements in different forms in tobacco and tobacco products. AB-8 resin is adopted for separation, and the inductively coupled plasma mass spectrometry is adopted for determination of contents of the chromium elements in different forms in the tobacco and tobacco products, wherein the chromium elements in different forms include inorganic chromium and organic chromium. The method for separation and determination of the chromium elements in different forms in tobacco and tobacco products is favorable in reproducibility and recovery rate, facilitates effective control on quantitative determination of contents of the chromium elements in different forms in the tobacco and tobacco products by related technical personnel in the tobacco industry, and provides strong technical support for comprehensive and objective evaluation on harmfulness of the chromium elements in tobacco and tobacco products in the tobacco industry.

The invention discloses an experiment on the assumption that indium (In) and tin (Sn) are separated from the hydrochloric acid (HCl) leaching solution of ITO (indium tin oxide) in a distillation manner and confirms that the optimum condition of distillation is to distill at 130 DEG C for 6h. According to the results, the satisfying indium / tin separation effect and indium recovery rate can be achieved by adopting the open-type distillation under the optimum condition of distillation.

The invention discloses a synthesis method of guanidine organic magnetic ionic liquid, in particular guanidyl cation-based organic magnetic ionic liquid. The synthesis method is technically characterized in that chloroalkane or bromoalkane, 1,1,3,3-tetramethyl guanidine, sodium hydroxide or potassium hydroxide, a 4-hydroxy-2,2,6,6-tetramethyl piperidine oxide and chlorosulfonic acid are used as raw materials to synthesize a series of paramagnetic organic magnetic ionic liquid, and the structural formula is as shown in formula (I) shown in the description. The compound is novel in structure and can form aqueous two phase with inorganic salt (potassium phosphate, dipotassium phosphate, potassium carbonate, sodium carbonate, ammonium bisulfate, sodium sulfate and the like); an aqueous two phase system of the magnetic ionic liquid is internationally developed for the first time. Compared with the traditional aqueous two phase system, the aqueous two phase system of the magnetic ionic liquid is capable of accelerating the separation of two phases through an applied magnetic field assisted manner, so as to improve the phase separation efficiency. The system has wide potential purposes, and has unique advantage in the fields of extraction, micro-extraction, separation and analysis.

The invention relates to a method for separating high-purity CO2 from CO2-containing raw gas. The method adopts a vacuum pressure swing adsorption gas separation device and contains a feeding adsorption step, a cocurrent pressure reduction step, an evacuation and exhaust step, a light weight reflux step, a countercurrent pressurization step and a pressurization step. Under the condition that raw gas compression and carbon dioxide product gas flushing do not need to be carried out, the method provided by the invention can be used for obtaining high-purity and high-recovery carbon dioxide through separation and purification with low energy consumption and high efficiency, equipment pressure drop is low, and vacuum requirement is not high; besides, the invention also relates to a device. Thedevice is applicable to the separation method provided by the invention, and the device has the advantages that height of an adsorption tower is low and cycle period is short, cost is saved for CO2 purification in industrial production, and a great economic value is generated.

The invention relates to a detection method of pesticide residues in a heart benefiting and pulse restoring particle. The method is gas chromatography-mass spectrography. The method comprises the following steps: preparing a sample solution, preparing a matrix matched standard working solution, and using a gas chromatograph-mass spectrograph to detect. The sample solution is prepared through the following steps: taking the heart benefiting and pulse restoring particle, adding water to dissolve the particle, adding n-hexane, carrying out ultrasonic extraction, adding sodium chloride and sodium acetate, uniformly mixing above substances, centrifuging the obtained mixture to obtain a supernatant, carrying out water-bath rotary evaporation until the supernatant is nearly dry, re-dissolving the nearly dry supernatant in acetone, adding the re-dissolved supernatant to anhydrous magnesium sulfate, a magnesium silicate adsorbent and C18, centrifuging the obtained solution, and taking the obtained supernatant.

The invention discloses an on-line solid-phase extraction gaschromatographic mass spectrometry detection method for organotin in a water body. The method comprises the following steps of (1) sampling;(2) sample preparation; (3) on-line solid-phase extraction purification-derivation; (4) concentration and making up to a volume; (5) gas chromatgraphy-mass spectrometrometry detection; (6) drawing ofa standard curve; (7) determination of a sample. The detection method has the advantages that the operation is simple, the sample pretreatment can be rapidly completed, a multiwalled carbon nanotubecolumn is adopted for the first time to achieve online enrichment, purification and derivation, only 25-30 minutes are needed in the whole on-line solid-phase extraction purification-derivation process, the multiwalled carbon nanotube column can be repeatedly used, the use period is 6 months, results are accurate, detection limits of nine kinds of organotin are 1-2.5 ng / L, the recovery rate is 82-116%, the relative standard deviation (n=5) is 3.7-8.5%, the method has higher sensitivity and satisfactory recovery rate and reproducibility, and the method can be used for determination of the content of the organotin in the water.

The invention provides a separating and measuring method for chromium elements with different valence states in cigarette mainstream smoke. The chromium elements with the different valence states are separated by adopting a PCX cation exchange solid-phase extraction column, and then the contents of the chromium elements with the different valence states in the cigarette mainstream smoke are measured by adopting inductively coupled plasma mass spectrometry, wherein the chromium elements with the different valence states comprise trivalent chromium and hexavalent chromium. The separating and measuring method for the chromium elements with the different valence states in the cigarette mainstream smoke disclosed by the invention is high in reproducibility and recovery rate, is favorable for relevant technical staff in tobacco industry to perform effective and quantitative measurement and control on the content of the chromium elements with the different valence states in the cigarette mainstream smoke, and provides powerful technical support for comprehensive and objective evaluation of the harmfulness of the chromium elements in the cigarette mainstream smoke in the tobacco industry.

The invention discloses a dispersive solid-phase extraction and gas chromatography-mass spectrometry detection method of organic tin environmental hormones in marine products. The organic tins in themarine products are measured by adopting ultrasonic extraction, freeze degreasing, first time dispersive solid-phase extraction purification, derivatization and back extraction, second time dispersivesolid-phase extraction purification, and gas chromatography-mass spectrometry method. The method is simple in operation, the sample pretreatment can be completed quickly, wherein twice dispersive solid-phase extraction is adopted for purification for the first time, the entire dispersive solid-phase extraction purification process plus the derivatization and back extraction only takes 20-30 min,the result is accurate, the detection limit of nine organic tins is 0.4-1.0 mu g / kg, the recovery rate is 80-117%, the relative standard deviation (n=5) is 3.8-7.5%, the sensitivity is relatively high, the recovery rate and reproducibility are satisfactory, and the dispersive solid-phase extraction and gas chromatography-mass spectrometry detection method can be used for the measurement of the content of the organic tins in the marine products.

The invention provides an ultrasensitive method for analyzing trace polybrominated diphenyl ethers in water. The method relates to a coated fiber and a solid-phase micro-extraction device containing the coated fiber as well as application of the coated fiber and the device, wherein the coated fiber comprises a fiber carrier and a coating material attached to the surface thereof, and the coating material is TpPa-1. By adopting the coated fiber, the high enrichment ratios, low detection limits, wide linear range, good repeatability and superior reproducibility are achieved.

The invention provides a method for testing the content of chromium, nickel, arsenic, selenium, cadmium, and lead elements in mainstream flue gas of an electronic cigarette. The method comprises: capturing particulate matters from mainstream flue gas of an electronic cigarette through a static capturing manner, extracting chromium, nickel, arsenic, selenium, cadmium and lead elements from the mainstream flue gas of the electronic cigarette with a solvent, taking an inductively-coupled plasma mass spectrometer as a testing device, and adopting an internal standard method to perform synchronousmeasurement of the content of chromium, nickel, arsenic, selenium, cadmium and lead elements in the mainstream flue gas of the electronic cigarette. The provided method is satisfactory in reproducibility and recovery rate, can be used for efficiently performing quantitative determination and control to chromium, nickel, arsenic, selenium, cadmium and lead elements in the mainstream flue gas of theelectronic cigarette by related technical staff in the tobacco industry, and provides powerful technical support for quality and safety evaluation of electronic cigarette products in the tobacco industry.

The invention provides a molecularly imprinted electrochemical sensor based on a FeS2 / C / MQDs / GCE modified electrode and a preparation method thereof, and the preparation method of the FeS2 / C / MQDs / GCE modified electrode sequentially comprises the following steps: respectively dispersing MQDs and FeS2 / C in a chitosan-acetic acid solution; the MQDs solution is dropwise added to GCE, drying is performed, and MQDs / GCE is obtained; and dropwise adding the FeS2 / C solution onto the MQDs / GCE, and drying to obtain the FeS2 / C / MQDs / GCE modified electrode. The invention also comprises the modified electrode prepared by the method, a molecularly imprinted electrochemical sensor based on the modified electrode, and a preparation method and application of the molecularly imprinted electrochemical sensor. The method has good reproducibility, acceptable stability and high selectivity, meanwhile, the simultaneous determination of the dipyridamole and the quinine sulfate is effectively realized, and the problems that the detection mode of the dipyridamole and the quinine sulfate is complex and expensive and the like are solved.

The invention discloses a dispersive liquid liquid micro-extraction gas chromatography-mass spectrometry for detecting major higher alcohols in fermented wine and belongs to the technical field of analytical chemistry. The method comprises the following steps: selecting appropriate extraction agents and dispersing agents, mixing a certain amount of extraction agents and dispersing agents with internal standard substances, rapidly injecting the mixture into a wine sample to form emulsion so as to be extracted, centrifugally collecting the extraction phase, performing gas chromatography-mass spectrometry, and quantifying through an external standard method, thereby obtaining analytical results of higher alcohols in the fermented wine. The DLLME (Dispersive Liquid Liquid Microextraction) method used for performing sample pretreatment has the advantages that the dose of an organic solvent is small, the operation is rapid, simple and convenient, the usage amount of the organic solvent is small, the detection result accuracy is high, and the recovery is satisfactory. By considering the advantages of low cost and environment friendliness, the method is easily used in practice, is particularly suitable for analysis of a large batch of samples, and can be applied to detecting the major higher alcohols in multiple kinds of fermented wine.

The invention provides a separating and measuring method for arsenic elements with different valence states in cigarette mainstream smoke. The arsenic elements with the different valence states are separated by adopting an AB-8 resin and 717-anion exchange resin, and then the contents of the arsenic elements with the different valence states in the cigarette mainstream smoke are measured by adopting inductively coupled plasma mass spectrometry, wherein the arsenic elements with the different valence states comprise trivalent arsenic and pentavalent arsenic. The separating and measuring method for the arsenic elements with the different valence states in the cigarette mainstream smoke disclosed by the invention is high in reproducibility and recovery rate, is favorable for relevant technical staff in tobacco industry to perform effective and quantitative measurement and control on the contents of the arsenic elements with the different valence states in the cigarette mainstream smoke, and provides powerful technical support for comprehensive and objective evaluation of the harmfulness of the arsenic elements in the cigarette mainstream smoke in the tobacco industry.

The invention provides a method for detecting the content of selenium in cigarette mainstream smoke. The method comprises the steps: collecting total particular matter selenium in the cigarette mainstream smoke in an electrostatic collecting manner, simultaneously collecting gas-phase selenium in the cigarette mainstream smoke by adopting an acidified ethanol solution, and measuring the content of selenium in the cigarette mainstream smoke by adopting an inductively coupled plasma mass spectrometry. The invention further provides a method for detecting the content of the gas-phase selenium in the cigarette mainstream smoke and application of the gas-phase selenium in the cigarette mainstream smoke. The method for detecting the content of selenium in the cigarette mainstream smoke has good reproducibility and recovery rate, and is beneficial for measuring the content of selenium in the cigarette mainstream smoke effectively and quantitatively by relative technical staff in the tobacco industry; and a strong technical support is provided for evaluating perniciousness of selenium in the cigarette mainstream smoke in the tobacco industry comprehensively and objectively.

The invention discloses a method for simultaneously determining arsenic forms of roxarsone, arsanilic acid and degradation products of same in soil, which comprises the following steps: adding a mixedextracting solution of NaH2PO4 and H3PO4 in a volume ratio of 9: 1 into a soil sample, uniformly mixing same, heating and extracting in a microwave digestion instrument, and centrifugally filtering the obtained extracting solution for high performance liquid chromatography-inductively coupled plasma-tandem mass spectrometry determination. The arsenic forms of roxarsone, arsanilic acid and degradation products of the same in the soil can be simultaneously and quickly determined; the determination accuracy, precision and stability all meet the requirements of environmental residue analysis anddetection; an adding standard recovery rate of roxarsone, arsanilic acid, monomethyl arsenic, dimethyl arsenic and inorganic arsenic ranges from 73.4% to 105.0%; the instrument detection limit rangesfrom 0.85 to 1.59 microgram / L, the precision ranges from 1.7% to 3.8%, and the requirement for polluted soil detection is met.

The invention belongs to the technical field of composite materials, and discloses a preparation method and application of a nitrogen-doped carbon dot-graphene oxide composite material, the preparation method comprises the following steps: mixing a carbon source and a nitrogen source, and carrying out hydrothermal reaction and solid-liquid separation to obtain a nitrogen-doped carbon dot solution; the method comprises the following steps: mixing and stirring graphene oxide and a reducing agent, carrying out solid-liquid separation, taking a solid phase, and dissolving to obtain a pre-reduced graphene oxide solution; performing ultrasonic mixing on the nitrogen-doped carbon dot solution and the pre-reduced graphene oxide solution, dropwise adding the mixed solution on an electrode, and performing cyclic voltammetry reduction to obtain the nitrogen-doped carbon dot-graphene oxide composite material. The prepared nitrogen-doped carbon dot-graphene oxide composite material has the advantages of nitrogen-doped carbon dots and graphene oxide at the same time, is successfully applied to electrochemical sensing determination of Cd < 2 + > and Pb < 2 + > in actual soil, and has a test recovery rate of 89.33-106.91%, and the result is satisfactory.

The invention provides a determination method for chromium, nickel, arsenic, selenium, cadmium and lead elements in main stream smoke of heated non-combustion type tobacco products. The method comprises the following steps: performing suction on a tobacco product by adopting an extractor hood, gathering the main stream smoke of the tobacco product by adopting an electrostatic gathering device, extracting main stream smoke particulate matter in the electrostatic gathering device with alcohol, and cleaning the electrostatic gathering device with nitric acid aqueous solution, so as to obtain sample solution; then performing inductive coupling inductively coupled plasma mass spectrometry detection. According to the method, the main stream smoke in the heated non-combustion type tobacco productare gathered by adopting the extractor hood and the electrostatic gathering device, the chromium, nickel, arsenic, selenium, cadmium and lead elements in main stream smoke of heated non-combustion type tobacco product are extracted with alcohol and nitric acid aqueous solution, and determination is performed through the inductive coupling inductively coupled plasma mass spectrometry; the method is very excellent in repeatability and recovery rate.

The invention belongs to the field of biosensing detection, and relates to a sensing method for detecting an annihilation type ratio electrochemical luminescence aptamer induced by a carboxyl ligand of Pb < 2 + >. The invention develops an electrochemiluminescence aptamer detection method for detecting the annihilation type ratio of Pb < 2 + > by taking carboxyl terpyridyl ruthenium with strong cathode-anode signal intensity as a luminous body and fixing resonance energy transfer receptor gold nanoparticles of the carboxyl terpyridyl ruthenium by utilizing the hybridization effect of a Pb < 2 + > aptamer and complementary DNA (Deoxyribose Nucleic Acid) of the Pb < 2 + > aptamer. The reliability of the annihilation ratio electrochemical luminescence method is improved by combining the carboxyl terpyridyl ruthenium with excellent annihilation performance and the resonance energy transfer receptor gold nanoparticles which can be distinguished at the cathode and the anode; due to the introduction of the aptamer of the specific recognition element Pb < 2 + >, the selectivity of the electrochemical luminescence method is improved, and the specific analysis of Pb < 2 + > is realized; the method is high in sensitivity, good in selectivity and high in reliability.

The invention discloses a preparation method of a nitrogen and sulfur co-doped ordered mesoporous carbon material, an electrode plate and application. Uniform doping of a mesoporous carbon material can be effectively realized by selecting a single carbon source as a nitrogen and sulfur co-doping agent, and thus the phenomenon of non-uniform doping of heteroatoms caused by multiple carbon sources is avoided. Compared with a carbon nano tube and graphene, the prepared nitrogen and sulfur co-doped ordered mesoporous carbon material shows higher electrocatalytic activity. An electrode plate prepared by coating of the nitrogen and sulfur co-doped ordered mesoporous carbon material can effectively detect amino triazole in a river water sample, the detection limit is relatively low, and a satisfactory recovery rate is obtained.

The invention relates to a method for measuring the content of potassium chloride and sodium chloride in a potassium chloride and sodium chloride injection solution, and a method for determining whether the content of potassium chloride and sodium chloride in the potassium chloride and sodium chloride injection solution meets quality standards. The measuring method is carried out through an atomic absorption spectrometry method by an atomic absorption spectrophotometer.

The invention provides a method for separating and measuring arsenic elements with different forms in main stream smoke of cigarettes. According to the method, AB-8 resin is adopted for separating, and the content of the arsenic elements with different forms in the main stream smoke of the cigarettes can be measured by an inductively coupled plasma mass spectrometry method, wherein the arsenic elements with different forms are inorganic arsenic and organic arsenic. The method for separating and measuring the arsenic elements with different forms in the main stream smoke of the cigarettes is good in reproducibility and recovery rate, is beneficial to the effective quantitative measurement control of related technical personnel of the tobacco industry for the contents of the arsenic elements with different forms in the main stream smoke of the cigarettes, and provides a powerful technical support for comprehensively and objectively evaluating the harmfulness of the arsenic elements in the main stream smoke of the cigarettes in the tobacco industry.

An endotoxin adsorbent comprising a crystalline cellulose having a nitrogen atom-containing cationic group can sufficiently remove endotoxin from a material containing endotoxin to be removed and containing a substance having a cationic group and can efficiently remove endotoxin also from a highly viscous material. The nitrogen atom-containing cationic group may be typically a functional group derived from a polyvalent amine and / or a quaternary ammonium salt. The crystalline cellulose having a nitrogen atom-containing cationic group may comprise the nitrogen atom-containing cationic group at a content of 0.05 to 3 meq / dry·g in terms of anion exchange capacity.

The invention relates to the technical field of detection of plant pesticide residues, in particular to a magnetic dextrin microsphere, a preparation method and application of the magnetic dextrin microsphere to determination of the residual quantity of chlorpyrifos in oyster mushrooms. According to the method for determining the residual quantity of the organophosphorus pesticide chlorpyrifos in the oyster mushrooms by combining a convertible hydrophilic solvent, magnetic solid-phase extraction, nano magnetic dextrin microspheres, a dispersive liquid-liquid microextraction technology and high performance chromatography, hexanoic acid is fully contacted with a sample to be detected for extraction, then the magnetic nano dextrin microspheres are used for adsorbing the hexanoic acid, and eluting the sample to be detected for detection. The prepared magnetic microspheres are used as a magnetic solid phase carrier, the magnetic microspheres for adsorbing the poisonous dead Japanese premna herb can be rapidly separated through an external magnetic field, the pretreatment time is obviously shortened, the solvent consumption is greatly reduced, the detection efficiency is greatly improved, meanwhile, low-toxicity caproic acid is used as a solvent, and the detection cost is reduced. The method has a great application value for detecting the chlorpyrifos residues in the oyster mushrooms.

The invention discloses a synthesis method of guanidine organic magnetic ionic liquid, in particular guanidyl cation-based organic magnetic ionic liquid. The synthesis method is technically characterized in that chloroalkane or bromoalkane, 1,1,3,3-tetramethyl guanidine, sodium hydroxide or potassium hydroxide, a 4-hydroxy-2,2,6,6-tetramethyl piperidine oxide and chlorosulfonic acid are used as raw materials to synthesize a series of paramagnetic organic magnetic ionic liquid, and the structural formula is as shown in formula (I) shown in the description. The compound is novel in structure and can form aqueous two phase with inorganic salt (potassium phosphate, dipotassium phosphate, potassium carbonate, sodium carbonate, ammonium bisulfate, sodium sulfate and the like); an aqueous two phase system of the magnetic ionic liquid is internationally developed for the first time. Compared with the traditional aqueous two phase system, the aqueous two phase system of the magnetic ionic liquid is capable of accelerating the separation of two phases through an applied magnetic field assisted manner, so as to improve the phase separation efficiency. The system has wide potential purposes, and has unique advantage in the fields of extraction, micro-extraction, separation and analysis.

The invention relates to the technical field of fluorescent probes, and discloses an oxathiacyclopentane-benzocoumarin compound, a preparation method thereof and application of the oxathiacyclopentane-benzocoumarin compound as a fluorescent probe. According to the oxathiolane-benzocoumarin compound, benzocoumarin serves as a fluorophore, and the compound serves as a fluorescent probe, has good optical properties, can specifically recognize HClO, and is short in response time, wide in pH application range, low in detection limit and good in water solubility. Besides, the probe BMH can be used as a solid probe to be applied to rapid detection of HClO, can also be used for detecting HClO in an actual water sample so as to obtain a satisfactory recovery rate, has good biocompatibility, and can be successfully applied to accurate monitoring of changes of levels of endogenous and exogenous HClO in natural HClO and living RAW 264.7 cells.

The invention provides a method for detecting the content of selenium in the mainstream smoke of cigarettes, which adopts an electrostatic capture method to capture selenium, the total particle phase component in the mainstream smoke of cigarettes, and simultaneously uses an acidified ethanol solution to capture the gas phase components in the mainstream smoke of cigarettes. Selenium, and the content of selenium in mainstream cigarette smoke was determined by inductively coupled plasma mass spectrometry. The invention also provides a method for detecting the content of selenium element in gas phase components in mainstream smoke of cigarettes and its application. The method for detecting the content of selenium in the mainstream smoke of cigarettes according to the present invention has good reproducibility and recovery rate, and is beneficial for relevant technicians in the tobacco industry to effectively quantitatively measure and control the content of selenium in the mainstream smoke of cigarettes, and also Provide strong technical support for the tobacco industry to comprehensively and objectively evaluate the harmfulness of selenium in mainstream cigarette smoke.

The invention provides a method for ultrasensitive analysis of trace polybrominated diphenyl ethers in water, which relates to a coated fiber and a solid-phase microextraction device comprising the coated fiber, as well as the application of the coated fiber and the device, wherein , the coated fiber includes a fiber carrier and a coating material attached to its surface, and the coating material is TpPa‑1. The coated fiber achieves high enrichment factor, low detection limit, wide linear range, good repeatability and superior reproducibility.

The invention provides a method for detecting 10 halogenated carbazole compounds in marine sediments, which belongs to the technical field of marine sediment detection, and comprises the following steps: extracting and purifying a to-be-detected sample by using self-made C18 bonded silica gel as an auxiliary agent, separating a standard substance or the to-be-detected sample by using a chromatographic column, retaining the standard substance or the to-be-detected sample in a mass spectrum, collecting accurate mass numbers, and determining the content of the halogenated carbazole compounds in the marine sediments. And optimizing the mass spectrum voltage, scanning and collecting parameters, and carrying out accurate qualitation and quantification on the 10 halogenated carbazole compounds. According to the method, the extraction effect of the halogenated carbazole compounds is improved by improving a C18 bonded silica gel preparation method, and then the halogenated carbazole compounds in the marine sediments are detected by utilizing qualitative and quantitative functions of gas chromatography-triple quadrupole tandem mass spectrometry. The method has the advantages of simplicity, convenience and rapidness in operation, capability of effectively reducing interference of matrix components, high sensitivity, high resolution and the like.