37 results about "Mercuric sulphate" patented technology

The invention discloses a preparation method for reagents D and E of a fast COD (Chemical Oxygen Demand) determinator, including preparation of the reagents D and reagent E, wherein the reagent D is a potassium dichromate-mercury sulfate solution, and the reagent E is a sulfuric acid-silver sulfate solution. The prepared reagents D and E are applicable to a 5B-3C type fast COD determinator and a 5B-1 intelligent type multifunctional digester of Lian-hua Tech.Co.,Ltd, and can also be used for COD determinators with the same determination principle in other manufacturers. The prepared reagents D and E can both achieve requirements of national standards on determining the accuracy of COD, and can replace the outsourcing reagents D and E for COD determination.

The invention discloses a composite dechlorination agent for removing high-concentration chlorine-containing wastewater and an application method thereof, which belong to the field of sewage treatment in environment protection. The composite dechlorination agent is prepared by compounding organic acids and inorganic salts, wherein the organic acids include two or more than two of nicotinic acid, citric acid, succinic acid, beta-ketoglutaric acid, and ketosuccinic acid; the inorganic salts include one or two of mercury sulfate, cadmium sulfate and copper sulfate; and the weight percentages of the organic acids and inorganic salts are 15-80% and 20-85% respectively. The application method comprises the steps of: adding the prepared composite dechlorination agent in percentage by weight of 0.05-0.5% into the high-concentration chlorine-containing wastewater and continuously stirring for 10-30min; adding a methylene dichloride solvent; standing for layering, separating, and subjecting obtained wastewater to air flotation treatment; and finally scraping off a layer of residue floating on the surface of the wastewater by a residue scraping machine to obtain the dechlorinated wastewater as the yielding water, wherein the dechlorinated wastewater can be lower than the national emission standard I. The composite dechlorination agent and the application method disclosed by the invention have the characteristics of simple technological process, smaller dosage of chemical agent, lower running expense, no sludge, high removal rate of chlorine ions in the wastewater, and the like; and the removal rate of chlorine ions in the wastewater can reach above 99.9%.

The invention relates to an anti-interference detection pretreatment method for a centralized sewage treatment plant in a chemical area and preparation and detection methods of a COD detection kit. The invention provides a pretreatment method for degrading wastewater to COD of less than or equal to 1000mg/L through a low-temperature condensation device in a laboratory and removing interference ofheavy metals and the like; and preparation and a method of the detection kit for determining COD content at the wavelength of 620nm by using Hash DR6000 are adopted. The COD detection kit comprises aCOD detection reagent and a digestion colorimetric tube. The COD detection reagent comprises a chromium reagent and a silver reagent, and the chromium reagent is prepared from, in part by weight, 1-10parts of potassium dichromate, 5-30 parts of concentrated sulfuric acid, 1-10 parts of mercury sulfate and 50-90 parts of distilled water; and the silver reagent is prepared from, in part by weight,30-70 parts of silver sulfate and 30-70 parts of concentrated sulfuric acid. According to the detection method, the detection precision of the COD content of the chemical wastewater is improved, and more accurate reference is provided for subsequent environment-friendly treatment. The detection kit can be automatically configured, so that the detection cost is greatly reduced, and the operation iseasy.

The invention relates to the technical field of mercury sulfate reagent recovery, in particular to a method for recycling a waste mercury sulfate reagent. The technical points comprise the following steps: 1) Mixing and replacing reaction: adding the waste mercury sulfate reagent into a reactor and adding a certain amount of zinc powder (Zn) or iron powder (Fe), stir uniformly to fully dissolve the zinc powder and iron powder, controlling a reaction temperature and time, occurring a replacing reaction in the reactor, and obtaining an elemental mercury product after purification; and 2) Treatment and discharging: carrying out condensation and activated carbon adsorption treatment to mercury-containing waste gas produced in step 1), discharging after reaching the standard, carrying out precipitation treatment to the wastewater produced in step 1), and discharging after reaching the standard. With simple operation and low processing cost, the recovery of the elemental mercury is realized,and the applicability is strong.

The invention relates to the field of water quality detection, in particular to a water quality detection prefabricated reagent. The water quality detection prefabricated reagent provided by the invention is prepared from the following components in parts by weight: a reagent A and a reagent B. The reagent A is prepared from 10-25 parts of potassium dichromate, 3-8 parts of concentrated sulfuric acid, 5-8 parts of mercury sulfate and 3-15 parts of distilled water, and the reagent B is prepared from 2-8 parts of silver sulfate and 3-15 parts of concentrated sulfuric acid. Compared with the prior art, the reagent provided by the invention has the advantages that the COD content in water can be effectively detected, the detection sensitivity is relatively high, and the reagent provided by theinvention is produced on a large scale, so that the stability of the reagent quality between batches can be well guaranteed, and the detection result is more reliable. Besides, the water quality detection reagent provided by the invention is low in price, can be quickly degraded and settled after detection, does not cause secondary pollution to a water body, and is convenient for large-scale popularization.

The invention belonging to the technical field of environment discloses a catalytic digestion column and a preparation method thereof, a CODCr rapid measuring device and a using method thereof. According to the method, a prepared catalytic digestion column and a chromogenic measuring column are assembled into digestion measuring equipment, and a CODCr rapid measuring device is obtained by combining a material bottle. When the CODCr rapid measuring device is in use, a to-be-measured water sample infiltrates and enters a micropore of the catalytic digestion column; a digestion solution is injected into the catalytic digestion column; under the effect of a catalyst, an organic matter in water is oxidized by hexavalent chromium and then Cr<3+> is obtained by reduction; after cleaning, only thehexavalent chromium is adsorbed in the catalytic digestion column, an indicator is added to react with the hexavalent chromium, color fading of the indicator is performed and the processed indicatorinfiltrates and is distributed on the surface of the chromogenic measuring column; and on the basis of contrast to a colourimetric card, a CODCr value of the water sample is directly determined. Withthe measuring device prepared by the method, the field rapid measurement of the CODCr is realized without interference; no expensive and highly toxic reagents such as silver sulfate and mercury sulfate are needed in the process; and the device can be used repeatedly and the measurement cost is low.

The invention discloses a method for rapidly detecting COD (Chemical Oxygen Demand) in industrial wastewater. According to the method, silver nitrate and bismuth nitrate are adopted as chloride ion masking agents, so that chloride ions in a detected sample can be effectively masked, and detection precision is greatly improved; manganese dihydrogen phosphate and potassium hydrogen sulfate are usedas catalysts, so that the oxidation of organic matters in the wastewater by potassium dichromate can be accelerated, and therefore, detection time is shortened, and detection efficiency is improved. With the method provided by the invention adopted, the use of silver sulfate and mercury sulfate is avoided; detection cost can be reduced; no secondary pollution is caused to the environment; detection time can be shortened; and the green and clean determination of the COD is realized.

The invention discloses a rustproof anti-crush coating for steel and iron and a preparation method of the rustproof anti-crush coating. The preparation method comprises the following steps: weighing spindle oil, mercury sulfate, benzotriazole, paraffin, diphenylamine, ethyecellulose, vaseline, polybutadiene polyalcohol, petroleum sodium sulfonate ketone, polyether polyisocyanate and dimethylbenzene, stirring the raw materials and then grinding the stirred raw materials, wherein the coating is used for steel and iron surface protection, the coating is smooth in appearance, the viscosity is 60-100 s, surface drying time is 1-5 h, and hard drying time is 20-24 h; the covering force is 200-240 g/cm<3>, and the coating has high adhesive force for metals and is hard in coating film; the coating is high in dampproof and rustproof capacities and water resistance, the shock resistance is 70-90 cm, the salt water resistance is 14-18 d under the condition of soaking in water of 30 DEG C, and the coating is free of bubbling or dropping; the flexibility is 2-4 mm, and the crushing and dropping resistance is high.

The invention relates to the field of water quality monitoring, in particular to a COD determination reagent and application thereof. The COD determination reagent comprises a reagent A and a reagentB, wherein the reagent A takes concentrated sulfuric acid as a solvent and is prepared from 110 g/L to 130 g/L of mercury sulfate, 60 g/L to 70 g/L of potassium dichromate, 8 g/L to 14 g/L of aluminumpotassium sulfate and 4 g/L to 10 g/L of ammonium molybdate; and the reagent B takes concentrated sulfuric acid as a solvent and contains 180-220g/L of silver sulfate. The COD determination reagent has the advantages of stability, high efficiency, convenience, high accuracy of determination data and wide determination range.

The invention belongs to the technical field of environment monitoring, particularly to a water quality chemical oxygen demand determination method which comprises the following steps: determining a dilution ratio f value; acidifying the water sample with 98% sulfuric acid; putting an acidified water sample into a digestion tube, sequentially adding a potassium dichromate standard solution, a mercury sulfate solution and a silver sulfate-sulfuric acid solution, and uniformly shaking; putting the digestion tube into a heater at 165 +/-2 DEG C for heating and digestion; completely transferring the solution in the digestion tube into a conical flask, taking ferroin as an indicator solution, and titrating with an ammonium ferrous sulfate standard solution until the color of the solution is brown; performing a blank test according to the same steps; and calculating a chemical oxygen demand (COD) result. The method disclosed by the invention is simple and easy to master in operation process, short in sample pretreatment time, capable of realizing batch treatment, small in amount of generated waste liquid, energy-saving and environment-friendly.

The invention discloses p-hydroxyphenylalanine urine detection reagent magnetic nanoparticles and a preparation method thereof. The p-hydroxyphenylalanine urine detection reagent magnetic nanoparticles are prepared from 26-42 parts of gelatin, 18-34 parts of acid-soluble chitosan, 0.6-1.2 parts of magnetic nano particles, 60-120 parts of absolute ethyl alcohol, 12-24 parts of mercury sulfate, 56-68 parts of mercurous nitrate, 2-6 parts of nickel sulfate, 1-3 parts of alpha-nitroso-beta naphthol and 64-120 parts of surfactant. According to the preparation method, each reagent is independently wrapped by the microsphere polymer shell base material, so that the stability of the detection reagent can be improved; and a complex preparation process is not needed, the reagent can be used for detection after being mixed with acid liquor, and can be made into portable detection equipment, and the accuracy of urinalysis is improved.