45 results about "ETHYLENEDIAMINE DIHYDROCHLORIDE" patented technology

The invention discloses an acidic soaping agent, which is characterized by comprising the following components in parts by weight: 80-120 parts of carboxy ethyl thio-succinic acid, 20-60 parts of maleic acid-crylic acid copolymer, 0.3-0.9 part of ethylenediamine dihydrochloride salicyl sodium acetate and 2-6 parts of defoaming agent. The acidic soaping agent disclosed by the invention has the beneficial effects that the acidic soaping agent is free from irritant odor because no acetic acid is added, the acidity of the acidic soaping agent is strong, and the acidic soaping agent has a good effect on neutralizing waste liquor. One working procedure of acid pickling or multiple working procedures of washing can be reduced, the sewage processing pressure is lightened, water is saved, and the cost and time for washing are lowered.

The invention belongs to the technical field of water quality monitoring, and relates to a method of measuring the ammonia nitrogen concentration of a water body. The method includes a step of preparatory work, a step of mapping an ammonia nitrogen standard curve, a step of mapping nitrite nitrogen standard curve, a step of mapping a curve of influences of nitrite nitrogen concentrations on ammonia nitrogen measurement absolute errors and a step of measuring the ammonia nitrogen concentration, which are five steps. Wider-range ammonia nitrogen and nitrite nitrogen concentrations in a high-salinity water body can be measured. Hypobromite oxidation time is shortened from 30 min to 10 min. Hydrochloric acid is adopted in place of phosphoric acid for a nitrite nitrogen color developing agent, thus reducing pollution. A hydrochloric acid solution of sulfanilamide and an aqueous solution of N-(1-naphthyl)ethylenediamine dihydrochloride are mixed, and therefore nitrite nitrogen concentration measuring steps are simplified. The upper limit of nitrite nitrogen concentration measurement is increased to a value that is three or more times of the upper limit in the national standard method in China. In a nitrite nitrogen concentration range of 0-0.75 mg / L, accuracy of measurement of ammonia nitrogen concentrations in a range of 0-1.25 mg / L is good. The method has characteristics of a simple process, reliable principles, short operation time, environment protection, energy conservation, a low economic cost, high operationality and high measurement result accuracy.

Methods for determining the concentration of nitrates in several types of water samples by photochemical reduction without the use of toxic materials such as cadmium or hydrazine, and having an approximately 100% reduction efficiency are described. A water sample mixed with a buffered aqueous solution including ammonium salts and EDTA is irradiated using ultraviolet light having wavelengths effective for photochemical conversion of nitrate and nitrite ions (NOx) to detectable species. The resulting species may be quantitatively determined by diazotization using sulfanilamide followed by coupling with N-(1-napthyl)ethylenediamine dihydrochloride which produces a water-soluble azo dye having a magenta color which may be colorimetrically measured at 540 nm from which the nitrate and nitrite concentration in the sample is determined. Nitrite present in the original sample may be colorimetrically analyzed using an unphotolyzed sample and the reaction with sulfanilamide followed by coupling with N-(1-napthyl)ethylenediamine dihydrochloride. When the nitrite concentration is subtracted from the total of the nitrate and nitrite concentration, the sample nitrate may be determined.

The invention provides an imidazole porous polymer based on a graphene oxide. The porous polymer is prepared from graphene oxide or a derivative thereof by means of cross-linking; the graphene oxide comprises an oxygen-containing functional group; the oxygen-containing functional group comprises a carboxyl; the derivative of the graphene oxide is a reaction product of the graphene oxide, chloroacetic acid and N-2-ethoxyl-iminodiacetic acid or N-2-ethoxyl-ethylenediamine dihydrochloride-N,N',N'-nitrilotriacetic acid; the molecular structure of the ortho-diamino compound contains two or more ortho-diamino parts. The imidazole porous polymer provided by the invention has high specific surface area, good carbon dioxide capture capability, excellent thermal stability, high specific capacitance value and good super-capacitor stability. The invention further relates to the reparation method of the imidazole porous polymer, and the application of the imidazole porous polymer in the field of carbon dioxide adsorption and the field of super-capacitors.

The invention relates to test paper for rapid detection of nitrites in food and a preparation method thereof, and belongs to the food safety detection field. The test paper comprises a detection substrate and detection test paper. The detection principle is that under an acidic condition, diazotization of nitrites in food is performed with sulfonic acid diazotization reagents, and a coupling reaction is performed with n-(1-naphthyl)-ethylenediamine dihydrochloride to generate a purplish red compound. The test paper is used for rapid detection of nitrite content in food; the method has the advantages of rapidness, sensitivity, simple operation, and low cost, requires no professional personnel to operate, is convenient for self application by common people at home, and is also applicable to rapid detection requirements in business, food safety, and markets.

The invention discloses an automatic chemical feeding and mixing method and device for detecting the nitrite nitrogen content. The method comprises the steps of injecting distilled water in a distilled water bottle in to a cuvette through a multiported valve, a micro-injection pump and a scaling liquid two-station two-way electromagnetic valve; collecting blank-value voltage values through a light emission device and a receiving device; injecting an external water sample into the cuvette; adding two kinds of chemicals of 4-aminobenzenesul fonamide and hydrochloric acid solution and N-(1-naphthyl)-ethylene diamine dihydrochloride solution into the cuvette; controlling four vibration base electromagnets and coils in a vibration base to be electrified; sequentially electrifying four vibration slider electromagnets and coils; mixing the chemicals and a water sample in the cuvette; collecting voltage values through the light emission device and the receiving device; calculating out an absorbance value of mixed solution according to a formula. The detection efficiency of the nitrite nitrogen content in water is improved through automatic sampling, chemical addition and detection.

The invention discloses a tetravalent platinum complex oxidant and a preparation method and application thereof in synthesizing of disulfide bonds in a polypeptide molecule. The tetravalent platinum complex oxidant has a structure shown in the formula (I), wherein n is 0 or 2; X is halide ion with -1 valence. The preparation method of the tetravalent platinum complex oxidant comprises the following steps of enabling potassium chloroplatinite and ethylenediamine dihydrochloride to react, so as to obtain dichloro(ethylenediamine)platinum; enabling the dichloro(ethylenediamine)platinum and a heteroaromatic ring containing two nitrogen atoms to react, so as to obtain an ion type bivalent platinum complex; enabling the ion type bivalent platinum complex and a hydrochloric acid solution containing hydrogen peroxide to oxidize, so as to obtain the tetravalent platinum complex oxidant. The tetravalent platinum complex oxidant has the advantages that the residual radicals of methionine are not oxidized, the reaction yield rate is high, the reaction rate in the stronger acid reaction medium is quick, and the cost for synthesizing the disulfide bonds in a pharmaceutical molecule by using the oxidant is greatly reduced.

The invention provides N-(1-naphthyl) ethylenediamine dinitrate, and a preparation method and application thereof. The structural formula of the N-(1-naphthyl) ethylenediamine dinitrate is shown as a formula (I) described in the specification; the preparation method of the N-(1-naphthyl) ethylenediamine dinitrate comprises the following step of: reacting N-(1-naphthyl) ethylenediamine dihydrochloride and silver nitrate to obtain the N-(1-naphthyl) ethylenediamine dinitrate; and the invention further provides the application of the N-(1-naphthyl) ethylenediamine dinitrate to determining the molecular weight of compounds in MALDI-TOF MS (Matrix-Assisted Laser Desorption / Ionization Time of Flight Mass Spectrometry).

The invention discloses a rapid aquaculture water ammonia nitrogen detection kit which comprises ammonia nitrogen testing agents I, ammonia nitrogen testing agents II, a color comparison bottle and a color comparison card. The testing agents comprise p-aminobenzene sulfonic acid, N-ethylenediamine dihydrochloride, acids, surface active agents, stabilizers and distilled water. The kit has the advantages that the kit is rapid, sensitive, convenient and rapid to use, stable in quality and the like, the kit solves the problems that a conventional detection kit is complex in operation step in the detection process or the agents go bad and changes colors as the agents are placed for a long time and the like, the kit is simple and efficient in operating step and applicable to rapid on-site detection of various water without adding any devices.

The invention provides a method for quickly detecting nitrates in food, the detection steps are as follows: 1) prepare sodium nitrate aqueous solution whose concentration changes successively, as a standard solution, add citric acid, anhydrous sodium sulfate, naphthaleneethylenediamine hydrochloride mixed 2) Add pure water to the sample, shake and extract to obtain the sample treatment solution; 3) Take the above sample treatment solution , add the powder reagent mixed by citric acid, anhydrous sodium sulfate, naphthalene ethylenediamine hydrochloride etc. in a certain proportion, leave standstill after mixing, obtain the sample color developing solution with color; 4) compare the color of the sample color developing solution with The colors of each standard chromogenic solution are compared to obtain the nitrate content in the tested sample. The invention can quickly and easily detect the content of nitrate in the food, has high sensitivity, and is suitable for rapid on-site determination of non-professionals.

The invention provides a para hydroxybenzene alanine urine detection kit. The para hydroxybenzene alanine urine detection kit comprises a reagent A, a reagent B, a reagent C and a reagent D which are stored in four containers respectively. The reagent A is an inorganic acid water solution with the concentration of 0.01-0.5 mol / L. The reagent B is a sodium nitrite water solution with the concentration of 0.01-0.5 mol / L. The reagent C is an inorganic acid water solution of an aniline derivative with the concentration of 0.005-0.1 mol / L, the concentration of inorganic acid ranges from 0.01-0.5 mol / L, and a benzene ring of the aniline derivative at least comprises a sulfo group or a nitro group or a cyano group or a fluorine group. The reagent D is a water solution of N-1-naphthyl ethylenediamine dihydrochloride, and the concentration of N-1-naphthyl ethylenediamine dihydrochloride is 0.01-0.3 mol / L. The concentration of the aniline derivative in the reagent C is not higher than that of inorganic acid in the reagent A and that of sodium nitrite in the reagent B. Inorganic acid is selected from hydrochloric acid or sulfuric acid or tetrafluoroboric acid or hexafluorophosphoric acid. The invention further provides a preparation method of the kit. The detection kit has the good stability, reliability and broad spectrum.

The invention belongs to the technical field of nitrogen content determination, and provides a determination method for ammonium nitrogen, nitric nitrogen, nitrite nitrogen and total dissolved nitrogen in samples. The method provided by the invention has the advantages that during determination of the ammonium nitrogen, a new oxidant (sodium hypochlorite and sodium chlorinated isocyanurate) and color developer (salicylic acid) system is adopted, the ammonium nitrogen is oxidized into monochloramine under the action of an oxidant, indophenol is obtained from the obtained monochloramine and a color developer, and the ultraviolet absorbance at a wavelength of 660nm is determined for measurement; a new first Griess reagent (N-(1-naphthyl)ethylenediamine dihydrochloride) and second Griess reagent (sulfanilamide and vanadium chloride) system is adopted for measurement of the nitric nitrogen, the nitrite nitrogen and the total dissolved nitrogen, so that low detection limits and high sensitivity are achieved; and the color development reaction is stable in speed and uniform, so as to be carried out on a 96-well plate.

The invention discloses a nitrite powder detection reagent and a preparation method thereof and belongs to the field of food and water quality detection. The detection reagent is prepared from components in parts by mass as follows: 50-100 parts of sodium chloride, 1-6 parts of sulfanilic acid, 2-8 parts of N-(1-naphthyl)ethylenediamine dihydrochloride, 0.5-4 parts of sodium benzoate, 0.5-2 partsof vitamin C and 1-5 parts of tea polyphenol. The nitrite powder detection reagent can detect nitrite in food and water conveniently, rapidly and accurately, is simple to operate during using and hashigh reaction sensitivity.

The invention relates to a detection method for separated-out gas in an ageing process of a high energy solid propellant and a device thereof. The detection method comprises the following steps: placing a propellant sample into a sampling bag, sealing the sampling bag and inflating nitrogen, and placing the sampling bag into an oven to be stored and aged; after ageing, taking out the sampling bag,connecting the sampling bag to an absorption device and a sampling device; extracting gas by a sampling pump; absorbing the gas by the absorption device and developing color by the same; carrying outdetection by means of spectrophotometry; and calculating the content of an analyte according to a standard curve. The contents of NO, NO2 and nitrate can be detected at the same time. The detection method based on the test principle of N-ethylenediamine dihydrochloride spectrophotometry solves the problem that aged and separated-out gas is low in concentration and hard to collect and quantify bycollecting the gas by means of the high-temperature-resistant corrosion-resistant gas sampling bag; a series device is reasonably designed to absorb the gas in steps and determine the gas, so that thetesting efficiency is improved greatly. The detection method provided by the invention can be used for representing the consumption rate and the decomposing mode of nitrate or a stabilizer when the high energy solid propellant is stored and aged, thereby providing support for monitoring the stability of the performance of the propellant, estimating the safe life of an engine and the like.

The invention discloses a rapid aquaculture water nitrite detection kit which comprises one bottle of testing agent, a color comparison bottle and a color comparison card. The testing agent comprises p-aminobenzene sulfonic acid, N-ethylenediamine dihydrochloride, acids, surface active agents, stabilizers and distilled water. The kit has the advantages that the kit is rapid, sensitive, convenient and rapid to use, stable in quality and the like, the kit solves the problems that a conventional detection kit is complex in operation step in the detection process or the agents go bad and changes colors as the agents are placed for a long time and the like, the kit is simple and efficient in operating step and applicable to rapid on-site detection of various water without adding any devices.

The invention relates to a method for recovering solvent acetone in the production of N-(1-naphthyl) ethylenediamine dihydrochloride, which comprises the following steps: (1) decoloring and removing impurities; (2) neutralizing; (3) drying and dehydrolyzing with a molecular sieve; and (4) distilling, and collecting the fraction at 56.5 DEG C to obtain the acetone conforming to the industrial standard. The recovering method can effectively recover the acetone in most of the acetone mother solution with the acetone recovery rate of above 65%, and the recovered acetone is of stable and reliable quality and can be reused. Thus, the production cost of the environment friendly reagent, namely the N-(1-naphthyl) ethylenediamine dihydrochloride, can be greatly reduced; what is more important, three wastes generated in the production are reduced with the reduction of total consumption of the acetone, thereby obviously reducing the pollution to the environment such as atmosphere, soil, water body and the like and making a great progress in the aspects of environment protection and economic benefit.

The invention relates to a method for preparing anhydrous ethylenediamine from double-amino silane byproduct ethylenediamine dihydrochloride, and belongs to the technical field of fine chemical engineering. The method comprises the following steps: using double-amino silane byproduct ethylenediamine dihydrochloride and calcium oxide powder, under the condition that an ethanediamine solvent exists,stirring at the temperature of 80 to 115 DEG C for a neutralization reaction, directly distilling after the reaction is completed to obtain water-containing ethanediamine with the water content of 2%to 3%, then adding calcium oxide powder into the water-containing ethanediamine under the effect of a catalyst, stirring at the temperature of 100 to 115 DEG C for a dehydration reaction, and then distilling to obtain anhydrous ethanediamine with the water content of smaller than 0.2%. The equipment technology is simple, the raw materials are cheap and easy to get, the method is safe and environmentally-friendly, the product quality is high, the product is low in water content, the product can be used as a raw material directly, the economic benefit is improved, and the method is applicable for industrial production.

The invention discloses a method for determination of the content of nitrite in jam. The method comprises the steps: mixing the jam, a saturated borax solution and water, and heating the obtained mixed solution in a boiling water bath, to obtain an extract liquid; mixing the extract liquid, a potassium ferrocyanide solution and a zinc acetate solution, allowing to stand, filtering the obtained mixture, and collecting an obtained purification liquid; mixing the purification liquid with a p-aminophenol sulfonic acid solution, allowing to stand for 5-8 minutes for the first time, then mixing theobtained mixture with an N-(1-naphthyl) ethylenediamine dihydrochloride solution, allowing to stand for 10-15 minutes for the second time, and making the volume of the obtained mixture constant with water, to obtain a to-be-detected liquid; and detecting the to-be-detected liquid by a spectrophotometric method, and determining the content of nitrite in the jam based on the detection result. The method for the determination of the content of nitrite in the jam can accurately determine the content of nitrite in the jam, and has the advantages of low detection limit, high recovery rate and precision degree and simple operation.

The invention discloses a rapid detection kit of nitrite nitrogen, a fabrication method of the rapid detection kit and a rapid detection method of the nitrite nitrogen. The rapid detection kit of thenitrite nitrogen comprises a package container, a developing water agent, a developing powder agent, a standard color card, an injector, a detection bottle and a second container, wherein the developing water agent, the developing powder agent, the standard color card, the injector, the detection bottle and the second container are accommodated in the package container, the detection bottle is provided with graduation lines, the second container is loaded with dilution water, the developing water agent and the developing powder agent are respectively loaded in a lightproof eyedrop bottle and alightproof first container, the developing water agent is diluted hydrochloric acid, and the developing powder agent is a mixed powder agent containing p-acetaminobenzenesulfamide, N-(1-naphthyl)-ethylenediamine dihydrochloride, sodium chloride, citric acid and / or a hydrate thereof. The rapid detection kit of the nitrite nitrogen is convenient to use, rapid detection of a site can be achieved, the rapid detection kit has relatively high practicability, and great convenience can be provided for a detection site in lack of detection equipment.

The invention discloses a detection reagent of nitrite in water and a preparation method of the detection reagent. The detection reagent comprises the following components in parts by mass: 1-2 parts of N-(1-naphthyl)-ethylenediamine dihydrochloride, 40-50 parts of polyvinylpyrrolidoneK-30, 5-10 parts of manganese sulfate, 15-20 parts of sulfanilamide, 40-50 parts of hydrochloric acid, 2-5 parts of sodium bicarbonate and 2-3 parts of sodium molybdate. The preparation method of the detection reagent comprises the following steps: a, uniformly mixing N-(1-naphthyl)-ethylenediamine dihydrochloride, polyvinylpyrrolidoneK-30 and sulfanilamide; b, fully mixing hydrochloric acid, manganese sulfate and sodium molybdate with sodium bicarbonate; c, uniformly mixing a substance A with a substance B. By utilizing the detection reagent of nitrite in water, the detection of nitrite in a water sample can be completed in the field; the detection reagent has the advantages of being simple in operation, high in accuracy and high in speed.

The invention relates to a green preparing method for high-purity N,N'-dibenzyl ethylenediamine diacetate. A by-product N,N'-dibenzyl ethylenediamine dihydrochloride or N,N'-dibenzyl ethylenediamine sulfate generated in the production process of long-acting cephalosporin medicine is used, and is neutralized, extracted and concentrated, then the product and acetic acid are mixed to form salt, and the high-purity N,N'-dibenzyl ethylenediamine diacetate is prepared. According to the green preparing method, discharging of liquid and solid waste is reduced, regeneration of the N,N'-dibenzyl ethylenediamine diacetate and recycling of waste are achieved, generation of the by-product or waste is reduced from the source, and therefore the aim of protecting and improving the environment is achieved.Compared with a traditional preparing method, the green preparing method has the advantages that the raw material is easy to obtain, the technology is simple, operation is easy and convenient, the production cost is low, and the green preparing method is more suitable for industrial production.

The invention discloses a high-efficiency bactericidal laundry liquid, which comprises the following components in parts by weight: 10-15 parts of dodecyl dimethyl benzyl ammonium chloride, 5-10 parts of didecyl dimethyl ammonium chloride, 5-10 parts of ethylenediamine hydrochloride, 8-15 parts of fatty alcohol polyoxyethylene ether, 0.1-0.5 parts of thickener, 0.1-0.5 parts of chelating agent, 80-95 parts of deionized water . The present invention adopts three kinds of cationic surfactants and nonionic surfactants to compound, and through the unique ratio, it can achieve synergistic antibacterial effect, not only can effectively kill Gram-positive bacteria and Gram-negative bacteria, but also It can kill fungi and has a good bactericidal effect.

The invention discloses a rapid detection reagent for nitrite in food, a kit and a corresponding detection method. The reagent comprises a reagent A and a reagent B, wherein the reagent A is a sodiumsulfanilate solution, and the reagent B is an N-ethylenediamine dihydrochloride solution. After the novel sodium sulfanilate solution is adopted as the reagent A, nitrite in the food can be rapidly and accurately detected, the detection process is simple to operate, and the reagent is low in cost. The sodium sulfanilate solution has the linear dependence of a standard curve superior to that of sulfanilic acid while relative to a sulfanilic acid solution, so that the reagent is suitable for automatic detection and interpretation of a multi-parameter analyzer.

Methods for determining the concentration of nitrates in several types of water samples by photochemical reduction without the use of toxic materials such as cadmium or hydrazine, and having an approximately 100% reduction efficiency are described. A water sample mixed with a buffered aqueous solution including ammonium salts and EDTA is irradiated using ultraviolet light having wavelengths effective for photochemical conversion of nitrate and nitrite ions (NOx) to detectable species. The resulting species may be quantitatively determined by diazotization using sulfanilamide followed by coupling with N-(1-napthyl)ethylenediamine dihydrochloride which produces a water-soluble azo dye having a magenta color which may be colorimetrically measured at 540 nm from which the nitrate and nitrite concentration in the sample is determined. Nitrite present in the original sample may be colorimetrically analyzed using an unphotolyzed sample and the reaction with sulfanilamide followed by coupling with N-(1-napthyl)ethylenediamine dihydrochloride. When the nitrite concentration is subtracted from the total of the nitrate and nitrite concentration, the sample nitrate may be determined.

The invention discloses a rapid aquaculture water nitrite detection kit which comprises one bottle of testing agent, a color comparison bottle and a color comparison card. The testing agent comprises p-aminobenzene sulfonic acid, N-ethylenediamine dihydrochloride, acids, surface active agents, stabilizers and distilled water. The kit has the advantages that the kit is rapid, sensitive, convenient and rapid to use, stable in quality and the like, the kit solves the problems that a conventional detection kit is complex in operation step in the detection process or the agents go bad and changes colors as the agents are placed for a long time and the like, the kit is simple and efficient in operating step and applicable to rapid on-site detection of various water without adding any devices.

The invention provides a method for determining ammonium nitrogen, nitrate nitrogen, nitrite nitrogen and total dissolved nitrogen in a sample, and belongs to the technical field of nitrogen content determination. When the ammonium nitrogen is measured, an oxidizing agent (sodium hypochlorite and sodium chloro isocyanurate) and color developing agent (salicylic acid) system is adopted, the ammonium nitrogen is oxidized into monochloramine under the action of the oxidizing agent, the formed monochloramine and the color developing agent form indophenol, and measurement is carried out by measuring the ultraviolet absorbance at the position of 660 nm; when nitrate nitrogen, nitrite nitrogen and total dissolved nitrogen are measured, a new first Griess reagent (N-(1-naphthyl) ethylenediamine dihydrochloride) and a second Griess reagent system (sulfanilamide and vanadium chloride) are adopted for measurement, the detection limit is low, and the sensitivity is high. The chromogenic reaction is stable and uniform in speed and can be carried out on a 96-well plate.

The invention provides a novel composition with anti-corrosion and anti-rust functions. The composition comprises the following components of, in percentage by weight, 35%-46% of caprylic / capric triglyceride, 8%-12% of high-carbon fatty alcohol-polyoxyethylene ether, 1%-3% of 3-chloro-2-hydroxypropyl trimethyl ammonium chloride, 0.01%-0.05% of N- ethylenediamine dihydrochloride, 0.01%-0.05% of dimethyl ketoxime, 0.01%-0.05% of hydroxylamine-O-sulfonic acid, 0.01%-0.02% of tetraethylammonium hydroxide, 0.01%-0.02% of potassium tert-butoxide and the balance of pure water. According to the composition, a dry film can be formed on the metal surface, later cleaning and removing treatment is facilitated, and the metal surface can be completely cleaned with clear water independently; the antirust performance of the composition is superior to that of a traditional water-based antirust agent; the environment-friendly degree is high, and phosphorus, sodium nitrite cancerogen and heavy metal toxic substances such as hexavalent chromium are not contained; The composition can replace traditional solvent type oily hard film anti-rust oil; the bad characteristic of flammability is avoided; and as a novel antirust, anticorrosion and corrosion inhibitor with the above effects, the composition has the advantages of good use effect and outstanding technical advantages.

The invention belongs to the technical field of water quality monitoring, and relates to a method of measuring the ammonia nitrogen concentration of a water body. The method includes a step of preparatory work, a step of mapping an ammonia nitrogen standard curve, a step of mapping nitrite nitrogen standard curve, a step of mapping a curve of influences of nitrite nitrogen concentrations on ammonia nitrogen measurement absolute errors and a step of measuring the ammonia nitrogen concentration, which are five steps. Wider-range ammonia nitrogen and nitrite nitrogen concentrations in a high-salinity water body can be measured. Hypobromite oxidation time is shortened from 30 min to 10 min. Hydrochloric acid is adopted in place of phosphoric acid for a nitrite nitrogen color developing agent, thus reducing pollution. A hydrochloric acid solution of sulfanilamide and an aqueous solution of N-(1-naphthyl)ethylenediamine dihydrochloride are mixed, and therefore nitrite nitrogen concentration measuring steps are simplified. The upper limit of nitrite nitrogen concentration measurement is increased to a value that is three or more times of the upper limit in the national standard method in China. In a nitrite nitrogen concentration range of 0-0.75 mg / L, accuracy of measurement of ammonia nitrogen concentrations in a range of 0-1.25 mg / L is good. The method has characteristics of a simple process, reliable principles, short operation time, environment protection, energy conservation, a low economic cost, high operationality and high measurement result accuracy.

The invention relates to a preparation method of an ozone heterogeneous oxidized solid catalyst, and belongs to the technical field of environmental protection and chemical catalyst. The preparation method comprises the following steps: taking perlite, albite, nitratine, dolomite, coal ash and coal gangue as carriers, performing lithium hypochlorite and bis(acetylacetonato) beryllium reaming, adding a surfactant N-decyl dimethyl-N'-trimethyl-2-hydroxypropyl ammonium dichloride to perform activating treatment under an ultrasonic effect; and then enabling the active carriers to perform hydrothermal reaction with the compound mineralizing agent borax and potassium sulfate, catalytic active promoter precursors tri(cyclopentadienyl) promethium, tris(4,4,4-trifluoro-1-(2-thienyl)-1,3-butanediono)europium (III), holmium oxalate decahydrate, lutetium carbonate hydrate, catalytic active center precursors cobalt gluconate, cupric glutamate, terpyridyl ruthenium chloride hexahydrate, dipotassium hexachloroosmium under the emulsifier N-oleyl-N'N'-diethyl ethylenediamine dihydrochloride, drying to remove the moisture, firing in a muffle furnace to obtain the ozone heterogeneous oxidized solid catalyst.

The invention discloses flue gas treatment fluid special for a hot chamber die casting machine. The flue gas treatment fluid is prepared from the following raw materials in parts by weight: 100-150 parts of deionized water, 10-15 parts of methylisobutylketone, 5-8 parts of zeolite powder, 5-12 parts of maleic anhydride, 20-40 parts of xylene, 15-25 parts of n-butyl alcohol, 4-8 parts of dimethylformamide, 10-15 parts of ethylene glycol, 3-9 parts of triisopropylphenyl, 5-12 parts of citric acid, 2-8 parts of sodium hypochlorite, 6-12 parts of N-ethylenediamine dihydrochloride, 2-4 parts of monoethanolamine, 1-5 parts of trimethylpentane, 2-8 parts of isooctane, 1-3 parts of sodium pyrophosphate, 1-2 parts of sulfonated cobalt phthalocyanine, 2-4 parts of hexamethylphosphoramide, 5-12 partsof complex fibers and 6-15 parts of compound colloid. According to the flue gas treatment fluid disclosed by the invention, flue gas produced during operation of the hot chamber die casting machine is treated, so that the emitted flue gas does not contain any pollutant, and the flue gas treatment fluid is environmentally friendly to atmosphere and harmless to a human body.