37 results about "Mercuric sulphate" patented technology

The invention discloses a method for measuring the chemical oxygen demand of waste water, which comprises the following steps: preparing standard solution of potassium dichromate, ferroin indicator solution, standard solution of ammonium ferrous sulfate, solution of sulfuric acid-silver sulfate and mercuric sulfate; diluting the mercuric sulfate in a water sample, adding the standard solution of potassium dichromate and a plurality of cleaned glass balls in a certain proportion; adding the solution of sulfuric acid-silver sulfate; heating the solution into an autoclave; after keeping the solution at a certain temperature and under a certain pressure for a period of time, adding water to continuously cool to room temperature; adding the ferroin indicator solution, performing titration through the standard solution of ammonium ferrous sulfate; recording the dosage of the standard solution of ammonium ferrous sulfate according to color changes; performing a blank experiment through distilled water according to the same operating steps; and recording the dosage of the standard solution of ammonium ferrous sulfate in blank titration. The method has the advantages of time conservation, and simple requirements on test conditions.

A preparation method for a urine monohydroxyphenyl metabolites detection reagent comprises the steps of preparing solution A, preparing solution B, preparing solution C, uniformly mixing solution A, solution B and solution C at the volume ratio of 1:(1.5-2):(0.5-1.5), adding distilled water into the mixture, and stirring the mixture uniformly, wherein solution A is a mixture prepared through reacting 1 part by weight of metallic mercury with 2-2.2 parts by weight of nitric acid and being diluted by distilled water; solution B is a nickel nitrate solution with the concentration of 0.05g / ml-0.15g / ml; solution C is a mercuric sulfate solution with the concentration of 0.05g / ml-0.15g / ml. The process for preparing testing reagents of monohydroxyphenyl metabolites in urine has the advantages of being low in production cost, and the prepared testing reagents of monohydroxyphenyl metabolites in urine is high in stability and sensitivity, low in false positive rate and false negative rate, and suitable for mass screening and clinical examination.

The invention discloses a method for analyzing the content of COD (chemical oxygen demand) in sewage with high chloride ion concentration. The method comprises the following steps: adding 5ml of 1mol / L silver nitrate solution into a sewage sample, mixing, uniformly shaking, precipitating, adding water for dilution till 25mL, performing centrifugal separation, taking 3mL of supernatant liquid, placing into a digestion pipe, adding 1mL of 10% mercury sulfate solution, 1mL of 0.025mol / L potassium dichromate oxidant solution and 5mL of 1% sulfuric acid-silver sulfate catalyst solution, plugging, uniformly shaking, digesting for 15min, taking out, cooling, and determining the COD content in the sample by applying a colorimetric method. According to the method, a silver salt precipitation method and a dilution method are combined and applied, AgNO3 is added into the chlorine-containing sewage sample to precipitate the chloride ions and further eliminate the interference of the chloride ions on the accuracy of COD determination result, the dilution method is further adopted to reduce the influence of nitrate radicals introduced by silver nitrate on an analytical system, the method is suitable for analyzing the content of COD in the sewage sample with the chlorine content of 1200-10000mg / L, and the accuracy in detection result is greatly improved.

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 discloses application of mercuride in preparing antivenom medicaments, aiming at solving the problems of unobvious treatment effect, high death rate and the like in the prior art, wherein the mercuride is one of mercuric sulfide, mercuric oxide, mercuric sulfate, mercuric chloride and the like. Because the main component in the mercuride is heavy metal which has the characteristic of inactivating all proteins, the mercuride has fatal destructive effect on all the proteins; and snake venom is formed by mixing dozens of poisonous proteins, therefore, the mercuride can inactivate the poisonous proteins in the snake venom so as to enable the poisonous proteins to lose activity (toxicity), thereby achieving the purpose of resisting the snake venom.

The invention discloses an economic and convenient water quality COD (Chemical Oxygen Demand) detection kit which comprises a COD detection reagent and a digestive colorimetric tube, wherein the COD detection reagent comprises a chromium reagent and a silver reagent; the chromium reagent comprises the following components in parts by weight: 1-10 parts 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 comprises the following components in parts by weight: 30-70 parts of silver sulfate and30-70 parts of concentrated sulfuric acid. The invention aims to provide the economic and convenient water quality COD detection kit. The kit can be automatically prepared, and is applicable to different types of spectrophotometers (comprising COD detection instruments on the market), extremely low in cost and simple in operation, and the economic and convenient aims are achieved.

The invention belongs to the field of water detection. The invention relates to a dichromate method for determining chemical oxygen demand in water. The dichromate method comprises the following steps: preparing a potassium dichromate standard solution, an ammonium ferrous sulfate standard solution, a mercury sulfate solution, a COD quality control standard solution and a ferrous sulfate indicator; preparing a calibration sample, a blank sample, a quality control sample and a to-be-detected sample; digesting the blank sample, the quality control sample and the to-be-detected sample, and addinga silver sulfate-sulfuric acid solution and ultrapure water; adding a ferrous sulfate indicator into the to-be-detected sample, the blank sample, the quality control sample and the calibration samplewhich are cooled to room temperature, and titrating by adopting an ammonium ferrous sulfate standard solution; recording the volume of the ammonium ferrous sulfate standard solution dropwise added into each sample; and calculating the actual concentration of the ammonium ferrous sulfate standard solution and the mass concentration of the chemical oxygen demand in the water according to a formula.The detection method is simple to operate, accurate in detection result and small in pollution.

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.

A reagent for detection of urine monophenolic metabolites and a method for preparing the reagent are disclosed, in which the monophenolic metabolites, for example, tyrosine, p-hydroxyphenyl alanine, tryptophan and 5-hydroxyindoleacetic acid can serve as tumor markers. The reagent for detection of urine monophenolic metabolites is an aqueous solution containing nitric acid, sulfuric acid, mercuric sulfate, mercurous nitrate, nickel nitrate, phosphomolybdic acid and cobalt sulfate. The preparation method includes preparation of solutions A, B, C, D and E, and mixing. The subject matter allows easy availability of raw materials, low cost, a simple preparation process, obtainment of reagents with stable performance which offer the advantages including high versatility, high sensitivity and good specificity when used in cancer detection, a simple detection process, a short detection cycle and easy determination, and is particularly suitable for large population screening, assistance in clinical cancer diagnosis and dynamic follow-up.

The invention relates to a method for measuring chemical oxygen demand of water by a rapid digestion method. The method comprises the following steps: sequentially adding a mercury sulfate solution, apotassium dichromate standard solution and explosion-boiling-resistant glass beads into a water sample, uniformly shaking, accurately placing a conical flask on a heating base before the heating baseis heated, mounting burr return pipes, and matching the conical flask with the burr return pipes one by one, clamping the conical flak on a first clamp, clamping the burr return pipe on a second clamp, allowing a lifting column to ascend through thread running fit, allowing the conical flask and the burr return pipes also to ascend while the lifting column ascends, and adding a silver sulfate-sulfuric acid solution to the upper openings of the burr return pipes; and starting the heating base for heating, starting to digest after the temperature of the heating base is constant, and calculatingthe chemical oxygen demand after the digestion is finished. The method has the advantages that the chemical oxygen demand in the water is measured through the dichromate method, the detection resultis accurate, the measurement process is simple and easy to operate, and pollution is small.

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 relates to a preparation method of a detection kit for sulfydryl metabolites in urine, the detection kit comprises a control reagent, a test reagent and color developing test paper, a solution of the test reagent is distilled water, a solution of the control reagent is a mercuric chloride solution or a mercuric sulfate solution, and a solution of the color developing test paper is distilled water. The chromogenic test paper is prepared by uniformly mixing a phosphotungstic acid reagent solution and a buffer solution according to a volume ratio of 1: 1, soaking qualitative low-speed filter paper in a chromogenic agent solution, taking out the filter paper, drying the filter paper in a box for 1 hour, and packaging the filter paper with a plastic bag. The detection kit disclosed by the invention has the characteristics of high accuracy, good specificity and the like, 215 diagnosed cervical cancer patients are detected, 188 patients are positive, and the positive coincidence rate is 87.4%; the reagent is used for screening 385 cases of general population, 7 cases are positive, the positive rate is 1.8%, and the specificity is 98.2%; meanwhile, 27 positive cases are obtained by using similar reagents on the market to detect the same crowd, the positive rate is 7%, and the specificity is 93%.

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 relates to a preparation method of a reagent for detection of monohydroxyphenol derivatives by sulfonation reaction. The monohydroxyphenol derivatives include tyrosine, p-hydroxyphenylalanine, tryptophan and 5-hydroxyindoleacetic acid. The monohydroxyphenol derivative urine detection reagent is an aqueous solution composed of sulfuric acid, mercury sulfate, chlorosulfonic acid and sulfolane. The preparation method includes: preparation a solution A, preparation of a solution B, preparation of a solution C, and finally mixing of the three solutions in certain proportion. According to the technical scheme provided by the invention, the raw materials are cheap and easily available, the preparation process is simple, the reagent has good stability, and has the characteristics of accurate testing, high sensitivity and good specificity, etc., the reaction time is short during detection, the result is easily judged, and the reagent is especially suitable for large-scale population general survey, clinical auxiliary diagnosis of cancer and dynamic check of efficacy.

The invention discloses a preparation method and application of an Au-Hg-rGO nano composite material. The preparation method comprises the following steps: preparing a chloroauric acid solution and acitric acid-sodium citrate buffer solution; uniformly mixing the chloroauric acid solution with a citric acid-sodium citrate buffer solution, quickly adding newly prepared sodium borohydride, and heating and stirring to obtain gold nanoparticles; adding a mercury sulfate solution into the gold nanoparticle solution, and stirring to obtain gold-mercury nanoparticles; putting graphene oxide into deionized water, and carrying out ultrasonic treatment for 1 hour to obtain a 1mg / mL graphene suspension; and adding gold-mercury nanoparticles into the graphene suspension, carrying out ultrasonic stirring and uniform mixing, then carrying out stirring with a magnetic stirrer, and carrying out ultraviolet irradiation for 1 to 3 h so as to obtain the Au-Hg / rGO nano composite material. The nano composite material has good catalytic performance on hydrogen peroxide, the linear range is 5-100 [mu] M, the detection limit is 3.25 [mu] M (S / N = 3), and the nano composite material has a good applicationprospect.

The invention discloses a method for shortening time for detecting COD (Chemical Oxygen Demand) in a water sample, and relates to the technical field of water sample detection methods, and the method comprises the following steps: taking 5ml of a water sample, and adding 2.5 ml of potassium dichromate, 0.1 g of mercury sulfate and 7.5 ml of silver sulfate into the water sample; heating and refluxing the water sample, and controlling the refluxing time to be 30 minutes; the water sample is cooled for 22.5 min, and then 20 ml of pure water is added into the water sample; the method comprises the following steps: adding three drops of a ferroin indicating solution into a water sample, and titrating with an ammonium ferrous sulfate solution with the concentration of 0.0025 mol / L until the color of the solution is changed from yellow to blue-green to red brown. According to the invention, the volume of the water sample is reduced to 5ml, the dosage of the added reagent is diluted on the original basis, and the reflux time is controlled to be shortened, so that the overall detection time is greatly shortened, and the detection efficiency is improved.

The invention relates to preparation of a water quality chemical oxygen demand (COD) detection agent, and a method for applying the water quality COD detection agent to environmental water body COD rapid detection. The COD detection agent is prepared to form two types of liquid through mixing and dissolving of permanganate, sulfuric acid, silver sulfate, potassium dichromate, potassium persulfateand mercury sulfate, the two types of liquid are sequentially added into a to-be-detected water sample to react for 5-10 min, and then measuring is conducted through a spectrophotometer or a water quality detector. According to the COD detection agent, atomic oxygen is generated through a composite oxidant in the presence of metal ions to quickly decompose organic matter and oxidation-reduction substances in water. The detection agent does not need to be heated and then dispelled, operation is easy, sensitivity is high, multiple properties are significantly superior to those of other current market commonly-adopted COD detection agents, the detection method is significantly superior to a COD national standard monitoring method GB 11914-89, and the COD detection agent is suitable for detection of various water qualities such as ground water, groundwater, tap water, domestic sewage and industrial wastewater with the COD being larger than 1 mg / L.

A catalytic digestion column and its preparation method, COD Cr A rapid measuring device and its usage method belong to the field of environmental technology. In this method, the prepared catalytic digestion column and chromogenic determination column are assembled into a digestion analyzer, and the COD is obtained by combining the material bottle. Cr Rapid determination device; when in use, the water sample to be tested penetrates into the micropores of the catalytic digestion column, and then the digestion solution is introduced into the catalytic digestion column. Under the action of the catalyst, the hexavalent chromium oxidizes the organic matter in the water and is reduced to Cr 3+ ; After cleaning, only the remaining hexavalent chromium is adsorbed in the catalytic digestion column, and then add the indicator to react with the hexavalent chromium, so that the indicator fades, and penetrates and distributes on the surface of the color measuring column. By comparing with the color comparison card, directly Determination of water sample COD Cr value. The assay device prepared by this method realizes COD Cr On-site rapid determination without interference, the process does not require expensive and highly toxic reagents such as silver sulfate and mercury sulfate, the device can be reused, and the determination cost is low.

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.

A preparation method for a urine monohydroxyphenyl metabolites detection reagent comprises the steps of preparing solution A, preparing solution B, preparing solution C, uniformly mixing solution A, solution B and solution C at the volume ratio of 1:(1.5-2):(0.5-1.5), adding distilled water into the mixture, and stirring the mixture uniformly, wherein solution A is a mixture prepared through reacting 1 part by weight of metallic mercury with 2-2.2 parts by weight of nitric acid and being diluted by distilled water; solution B is a nickel nitrate solution with the concentration of 0.05g / ml-0.15g / ml; solution C is a mercuric sulfate solution with the concentration of 0.05g / ml-0.15g / ml. The process for preparing testing reagents of monohydroxyphenyl metabolites in urine has the advantages of being low in production cost, and the prepared testing reagents of monohydroxyphenyl metabolites in urine is high in stability and sensitivity, low in false positive rate and false negative rate, and suitable for mass screening and clinical examination.

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.

The invention relates to a preparation method of a reagent for detection of monohydroxyphenol derivatives by sulfonation reaction. The monohydroxyphenol derivatives include tyrosine, p-hydroxyphenylalanine, tryptophan and 5-hydroxyindoleacetic acid. The monohydroxyphenol derivative urine detection reagent is an aqueous solution composed of sulfuric acid, mercury sulfate, chlorosulfonic acid and sulfolane. The preparation method includes: preparation a solution A, preparation of a solution B, preparation of a solution C, and finally mixing of the three solutions in certain proportion. According to the technical scheme provided by the invention, the raw materials are cheap and easily available, the preparation process is simple, the reagent has good stability, and has the characteristics of accurate testing, high sensitivity and good specificity, etc., the reaction time is short during detection, the result is easily judged, and the reagent is especially suitable for large-scale population general survey, clinical auxiliary diagnosis of cancer and dynamic check of efficacy.

The invention discloses a method for rapidly determining the content of COD in chlorine-containing wastewater, which is characterized in that mercury sulfate is used as a chloride ion masking agent, potassium dichromate is used as an oxidizing agent, titanium sulfate is used as a catalyst, and a titanium sulfate-sulfuric acid solution is used for replacing silver sulfate-concentrated sulfuric acid, so that the influence of chloride ions on COD detection is greatly reduced. The rapid digestion temperature is 140 DEG C, and high-temperature digestion is replaced by low-temperature digestion, so that the operation safety is improved, and the requirement on an instrument is reduced.

The invention discloses a method for rapidly determining high-range COD (Chemical Oxygen Demand). The method comprises the following steps: firstly, preparing a high-range digestion solution, then drawing a working curve, then detecting the content of chloride ions in a water sample, adding mercury sulfate as a masking agent into a clean colorimetric tube, and then adding the high-range digestion solution into the colorimetric tube; adding a water sample or a diluted water sample into the colorimetric tube, tightening a cover, uniformly shaking, and digesting in a digester; cooling after digestion is finished, taking out, shaking uniformly, placing at room temperature, wiping the outer surface of the colorimetric tube, putting into a spectrophotometer, and reading the COD value of the water sample by utilizing a drawn working curve. According to the invention, while the accuracy of an experimental result is ensured, tedious experimental steps are simplified, personal errors are reduced, the discharge amount of waste liquid is also reduced, and the environment is protected. And meanwhile, the flexibility is high, and the working curve range can be adjusted according to the actual application condition.