68 results about "Ethylenediamine hydrochloride" patented technology

The invention belongs to the field of chemical detection and particularly relates to test paper for rapidly detecting nitrite and a preparation method and application of the test paper. According preparation method, the test paper for rapidly detecting the nitrite is prepared by taking a filter paper body as a carrier, a p-aminobenzene sulfonic acid solution and an N-1-naphthyl ethylenediamine hydrochloride as color developing agents, as well as an ethanol water solution of polyvinyl alcohol as a surface protectant and can be used for detecting the content of the nitrite. The test paper is low in cost, convenient and rapid to use and has long-term stability.

The invention provides a water quality nitrite detection agent, and relates to a field detection technology for nitrite content in a water media. The water quality nitrite detection agent is prepared by mainly mixing sulfanilamide, N-(1-naphthyl)-ethylenediamine hydrochloride, phosphoric acid, sodium sulfate and the like according to a certain ratio. During use, the water quality nitrite detection agent is directly dissolved in 10 ml of a water sample, mixing is performed for 1-2 min to dissolve, and a spectrophotometer or a tintometer is adopted to measure. The water quality nitrite detection agent has the following characteristics that: carrying is convenient, the water quality nitrite detection agent is easy to store, any reagents are not required to be added during use, the result is accurate and reliable, and the water quality nitrite detection agent is applicable for field detection of the nitrite content in the water quality sample.

The invention discloses an antistatic anti-yellowing PP / POE plastic for automotive interior parts and a preparation method thereof. The antistatic anti-yellowing PP / POE plastic for automotive interior parts comprises the following components in parts by weight: 100 parts of PP resin, 15-30 parts of POE plastic, 2-15 parts of antistatic agent and 0.5-2 parts of anti-yellowing agent. Preferably, the antistatic agent is one or a mixture of more of glyceryl monopalmitate, N-oleoyl-N',N'-diethyl ethylenediamine-hydrochloride, 3-sulfopropyl dodecyl dimethyl betaine and carbon black; and the anti-yellowing agent is one or a mixture of more of dibutyl hydroxy toluene, tri(2,4-di-tert-Butylphenyl)phosphite, 4,4'-di(phenylisopropyl)diphenylamine and pentaerythritol tetra[beta-(3,5-di-tert-Butyl-4-hydroxyphenyl)propionate]. According to the invention, the antistatic anti-yellowing PP / POE plastic has low production cost, good processability, favorable antistatic property and anti-yellowing property and environment friendliness. The antistatic anti-yellowing PP / POE plastic for automotive interior parts is especially suitable for injection molding of various automotive interior parts.

The invention discloses a vanadium trichloride mixed powder and the application thereof in quickly measuring the nitrate content in the food. The vanadium trichloride mixed powder is composed of sodium chloride, sulfamic acid, sulfanilic acid, naphthyl ethylenediamine hydrochloride and vanadium trichloride. When the vanadium trichloride mixed powder is applied to quickly measure the nitrate content in the food, firstly, the food is homogenized and then metered in volume by using the acetic acid solution. After that, the homogenized food is oscillated and filtered to obtain a sample solution. Secondly, the vanadium trichloride mixed powder is added into the sample solution, and the obtained product is shaken uniformly, subjected to water bath and cooled. The light absorption value of the obtained product is measured and then the nitrate content is calculated according to a standard curve. According to the technical scheme of the invention, the method is simple and easy to operate, fast, short in consumed time, sensitive, accurate, small in reagent consumption, and low in cost. Meanwhile, an operator can master the method without being specially trained. Moreover, reagents adopted in the method are not volatilized, free of odors and extremely small in toxicity to human bodies. The mixed power is good in stability. The detection reagent is harmless to the environment and human bodies. Therefore, the vanadium trichloride mixed powder has a wide application prospect in detecting the nitrate content in the rapid detection field of food especially the rapid detection field of fresh vegetables.

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 relates to a preparation and use method of a rapid detection agent for determination of water quality aniline concentration, the a rapid detection agent comprises two kinds of powder, and is prepared by mainly mixing sodium nitrite, N-(1-naphthyl) ethylenediamine hydrochloride, ammonium sulfamate, amino sulfonic acid and the like, the two kinds of powder are successively added into a to-be-tested sample, and a spectrophotometer or a colorimeter is used for direct measurement of a chromophoric solution. The rapid aniline detection agent is easy to store, easy to carry, stable in performance, accurate and reliable in result, and simple in operation, can be used by non-professional personnel, and is suitable for on-site rapid detection of aniline in water surface water, industrial waste water and other water bodies.

The invention relates to a preparation method of high-purity naphthyl ethylenediamine hydrochloride. The method uses bromonaphthalene and ethylenediamine for carrying out the alkylation reaction under the action of a copper-copper oxide catalyst, thereby generating naphthyl ethylenediamine; and the reaction products are purified by using benzene, ethanol and other organic solvents, and the products after the purification are dissolved in hydrochloric acid, thereby generating the high-purity naphthyl ethylenediamine hydrochloride. The method is simple and easy, the generated naphthyl ethylenediamine hydrochloride not only has high purity, but also is applicable to the environmental monitoring; furthermore, the various reagents can be recycled during the reaction process, and the residual reagents can be reused, thereby saving the cost.

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 detection reagent for nitrate in hot pickled tuber mustard and a detection method thereof. The detection reagent comprises, by weight, the following components of 12-16 parts of toluidine blue, 12-16 parts of N-(1-naphthyl) ethylenediamine hydrochloride, 5-8 parts of sulfanilamide, 3-5 parts of sodium acetate, 1-4 parts of acetone, 1-3 parts of sodium xylene sulfonate, 5-10 parts of inorganic salt, 10-15 parts of oxalic acid and 80-100 parts of water. The detection method comprises the steps that the hot pickled tuber mustard is chopped and then squeezed, after dregs are removed, juice is taken and diluted with water for 5-10 times, 2-3 drops of the nitrate detection reagent is added in the juice and stirred for 2-3 min, and the changes of the solution color is observed. Compared with the prior art, the nitrate detection reagent can more quickly detect whether the nitrate content exceeds the standard, the precision rate of content measuring is high, and the higher detection efficiency is achieved.

The invention discloses a continuous production reaction device and a continuous production reaction method for N-(beta-aminoethyl)-gamma-aminopropyltrimethoxysilane, which belong to the technical field of silane coupling agents. The invention designs a tower-type continuous reaction device, wherein a mixed solution of ethylenediamine and chloropropyl trimethoxysilane, which is sprayed downwards from the top of a reaction tower (2) finishes reaction in a falling process in the reaction tower (2) under the excessive protection of ascending ethylenediamine vaporization liquid, and is automatically pumped into a continuous sedimentation liquid separator by a material transfer pump (12) for automatically controlling the amount of a reaction liquid in a reaction kettle (3) to perform continuous liquid separation; the obtained clear liquid is rectified to obtain N-(beta-aminoethyl)-gamma-aminopropyltrimethoxysilane. The device disclosed by the invention is matched with the process, and continuous reaction and continuous liquid separation can be performed to realize production; the consumption of ethylenediamine is effectively reduced, and both purity and yield are high; the production efficiency is improved while the reaction continuity is ensured, and no ethylenediamine hydrochloride in the separated clear liquid can also be ensured.

The invention discloses an antistatic plastic automobile radiator grille and its preparation method. The antistatic plastic automobile radiator grille comprises the following components by weight: 100 parts of ABS plastics, 30-70 parts of PVC plastics, 10-20 parts of glass fibers, and 0.1-0.5 part of an antistatic agent. The antistatic agent is preferably composed of the following components by weight: 10-30 parts of sodium allysulfonate, 10-30 parts of dodecyl dimethyl betaine, 10-20 parts of glycerol monopalmitate, and 5-10 parts of N-oleoyl-N', N'-diethyl ethylenediamine hydrochloride. The antistatic plastic automobile radiator grille provided in the invention has high tensile strength, bending strength, bending modulus and notch impact strength.

The invention discloses a method for detecting the nitrate ion in iron-containing pickling waste liquid. The method comprises the steps of: flocculating and precipitating the iron-containing picklingwaste liquid, separating to obtain transparent supernatant, adding zinc powder and cadmium chloride solution into the supernatant, stirring and mixing uniformly, performing stirring reaction, taking the supernatant to dilute by adding water after reaction solution is standing, adding sulfanilic acid solution, adding naphthalene ethylenediamine hydrochloride solution after mixing uniformly and placing, placing to develop after mixing uniformly, determining the absorbance value by adopting an ultraviolet spectrophotometer, and obtaining the nitrate content by calculation. According to the detection method in the invention, reaction conditions, such as reduced zinc powder, are controlled; the synergy maximization of the detection effect is achieved; interference of impurities, such as co-existing ion, on a detection result is reduced; the detection result error can be controlled below 4.6%; accurate determination of the nitrate ion in the iron-containing pickling waste liquid is realized;operation is simple; the cost is low; complex pre-processing is not required; the detection speed is rapid; and, the method can be widely used for industrial determination.

The invention discloses a preparation method of N-(3-chlorine-4-(2-pyridine methoxy)phenyl)-2-cyanoacetamide. The method comprises the following steps: under the existence of 1-(3-dimethylaminopropyl)-3-ethylenediamine hydrochloride, 1-hydroxybenzotriazole and triethylamine, carrying out a reaction of 3-chlorine-4-fluoroaniline and cyanoacetic acid to generate N-(3-chlorine-4-fluorophenyl)-2-cyanoacetamide; under the existence of lithium hydroxide, continuously carrying out a reaction with 2-pyridylcarbinol to generate the N-(3-chlorine-4-(2-pyridine methoxy)phenyl)-2-cyanoacetamide. The method is simple in step, mild in reaction condition, high in product yield and easy in mass production. (The formula is shown in the description).

The invention discloses Rhodopseudomonas palustris P-3. The preservation number of the Rhodopseudomonas palustris P-3 is CCTCC (China Center For Type Culture Collection) NO: M 2020808. According to the strain, photosynthetic bacteria are separated and purified by adopting a double-layer plate coating method and a streaking method, vibrio parahaemolyticus, vibrio vulnificus and vibrio anguillarum are used as indicator bacteria, and the bacteriostatic action of the marine photosynthetic bacteria strain is determined by adopting an oxford cup method. Naphthalene ethylenediamine hydrochloride spectrophotometry and indophenol blue spectrophotometry are adopted to determine the nitrite nitrogen and ammonia nitrogen degradation effects of different strains, and screening is performed to obtain the product. The strain P-3 has the composite functions of resisting vibrio and efficiently degrading nitrite nitrogen and ammonia nitrogen, has a strong inhibition effect on vibrio anguillarum, has thestrongest effect on vibrio anguillarum, and also has a certain nitrite nitrogen and ammonia nitrogen degradation effect. The strain P-3 is cultured in a culture medium containing 50mg / L ammonia nitrogen and nitrite nitrogen for 4 days, the degradation rates are 89.68% and 94.98% respectively, and the strain P-3 has a wide application prospect.

The invention discloses a preparation method and a product of ethylenediamine. The preparation method comprises steps as follows: industrial ethylenediamine hydrochloride is utilized as a raw materialand subjected to heating melting, then solid sodium hydroxide is taken as a neutralizer, a waterproof reaction and atmospheric distillation are performed, and ethylenediamine is obtained; the obtained ethylenediamine product is subjected to physical absorption dewatering and / or batch fractionating dewatering by a molecular sieve, anhydrous magnesium sulfate or sodium hydroxide solids for dewatering purification, and purity of the finally prepared product can reach 99%. The operation difficulty of an ethylenediamine recovery process is reduced, economic benefit is increased, and the problem about recovery of ethylenediamine by a factory is solved to a certain degree.

The invention discloses a hexavanadate-L-alanine methyl ester derivative and a preparation method and application of the hexavanadate-L-alanine methyl ester derivative, and belongs to the technical field of organic and inorganic hybrid materials. The hexavanadate-L-alanine methyl ester derivative has an anti-tumor activity, the structural formula is [Bu4N]2[V6O13]{(OCH2)3CCH2OOCCH2CH2CONHCH(CH3)CH2COOCH3}2]; the preparation method comprises the following steps: adding 1-(3-dimethyl aminopropyl)-3-ethylenediamine hydrochloride, 1-hydroxybenzotriazole, L-D-alanine methyl ester hydrochloride andtrimethylamine into an acetonitrile solution of the hexavanadate succinic acid derivative, dissolving, and reacting for 40-50 hours at the temperature of 48-52 DEG C to obtain the hexavanadate-L-alanine methyl ester derivative. The hexavanadate-L-alanine methyl ester derivative has an important research value and application prospect in the fields of pharmaceutical chemistry, and further providesa direction for the development of medicines.

The invention relates to a controlled release material for a fouling organism-sensitive response anti-fouling agent and a preparation method of the controlled release material. The controlled release material contains a coated precursor and a cross-linking agent; a hyaluronic acid / poly L-lysine controlled release material of a nano thin-shell structure is prepared through alternating layer-by-layer self-assembly of hyaluronic acid and poly L-lysine; a poly-(allylamine hydrochloride) / poly L-glycine controlled release material of the nano thin-shell structure is prepared through alternating layer-by-layer self-assembly of poly-(allylamine hydrochloride) and poly L-glycine; and the cross-linking agent is prepared by compounding 1-(3-dimethylamino propyl)-3-ethylenediamine hydrochloride and N-hydroxysulfosuccinimide sodium salt. For a water-soluble anti-fouling agent, a fouling organism-sensitive response nano thin-shell is prepared from sodium carbonate as a template and the anti-fouling agent is loaded; and a water-based insoluble or micro-soluble antifouling agent is directly coated with a fouling organism-sensitive response controlled release material. The controlled release material is simple in process and friendly to environment; the target of adaptive regulation of release of the anti-fouling agent along with fouling organism attachment change in low and peak seasons is achieved on the basis of a special catalytic hydrolysis characteristic of fouling organism extracellular protease on the controlled release material; and the anti-fouling period of the paint is prolonged.

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 present invention provides a detection reagent for the ammonia nitrogen content in industrial wastewater, and a detection method thereof. The detection reagent comprises N-(1-naphthyl)-ethylenediamine hydrochloride, diammonium phosphate, sodium metavanadate, trinitro salicylic acid, nitro ammonium phosphate, an inorganic acid and water. The detection method comprises: taking two detection reagents with the same volume, and adding industrial wastewater to be detected to the first detection reagent to form a first mixed solution; adopting the second mixed solution as a reference to observe the color change of the first mixed solution, wherein the color of the solution is changed into the purple red color from the colorless color when the ammonia nitrogen content in the industrial wastewater exceeds the standard; and recording the color change time. According to the present invention, the time for detecting whether the ammonia nitrogen content in the industrial wastewater exceeds the standard is only 2.1-2.4 min, such that the detection reagent of the present invention has the high detection efficiency compared with the detection reagent in the prior art.

The invention relates to a technology for preparing double-amino silane and treating by-product, belonging to the field of chemical technology. By adopting a reaction way of dripping chloropropylated silane, the technology reduces the energy consumption and shortens the reaction time. Meanwhile, the technology can be used for treating the by-product ethylenediamine hydrochloride, so that the production cost is lowered, the environmental pollution is reduced, and the problem that the existing by-product ethylenediamine hydrochloride is treated by distilling through strong alkali solution, so that the treated by-product can not be reused as raw material can be solved; and the problems that the cost is high when the by-product is treated by sodium alcoholate, and the product yield is reduced after the treated by-product is reused as raw material can be solved. After the technology is adopted, the product yield is improved, and the treated by-product can be reused, so that the technology is suitable for industrial production and has higher economic effect and environmental protection effect.

The invention discloses a method for detecting chlordimeform in aquatic products. The method comprises the following steps: step a, extracting and preparing a to-be-detected sample solution; b, preparing a first sample solution; c, adding a sodium hydrosulfide solution and an ammonium sulfate solution for reaction to prepare a second sample solution; step d, adding calcium hydroxide, chlorine and air to prepare a third sample solution; step e, adding a sodium hydroxide solution to prepare a fourth sample solution; step f, adding a sodium nitrite solution and a hydrochloric acid solution to prepare a fifth sample solution; step g, adding a naphthyl ethylenediamine hydrochloride solution to prepare a sixth sample solution, standing, and observing the color change of the sixth sample solution; and step h, judging a result. The method disclosed by the invention is simple and easy to understand in principle, strong in specificity, high in sensitivity, visual in detection result, high in accuracy of the detection result, free of a large-scale analysis instrument, relatively less in time consumption and extremely low in average analysis cost, is specially suitable for on-site rapid detection of the chlordimeform content in the aquatic product, and has very strong practicability.

The invention discloses a disinfection laundry detergent which comprises the following components in parts by weight: 10-15 parts of dodecyl dimethyl benzyl ammonium bromide, 5-10 parts of dioctadecyl dimethyl ammonium chloride, 5-10 parts of ethylidene oleamide ethylenediamine-hydrochloride, 8-15 parts of fatty alcohol-polyoxyethylene ether, 0.1-0.5 part of a thickening agent, 0.1-0.5 part of a chelating agent and 80-95 parts of deionized water. The disinfection laundry detergent is compounded by three cationic surfactants and nonionic surfactants, achieves synergistic antibacterial effects through unique proportioning, can not only effectively kill gram positive bacteria and gram negative bacteria but also kill fungi, and has a good antibacterial effect.

The invention discloses high-moisture-absorption polylactic acid fibers for medical paper towel. The high-moisture-absorption polylactic acid fibers are prepared from the following raw materials in parts by weight: 80 to 100 parts of plylactic acid, 15 to 25 parts of compatilizer, 6 to 12 parts of wool fibers, 5 to 9 parts of coconut fibers, 4 to 8 parts of vermiculite powder, 2 to 4 parts of white carbon black, 6 to 12 parts of plasticizer, 2 to 3 parts of coloring agent, 1 to 2 parts of lubricating agent, and 1.5 to 2.5 parts of dispersing agent. The compatilizer comprises the following components in parts by weight: 20 to 30 parts of gelatin compound, and 0.6 to 1 parts of aluminum-zirconium coupling agent. The gelatin compound is prepared by adopting the following process: drying bamboo powder, crushing, soaking in a sodium hydroxide solution, filtering, drying, adding an ethanol solution, 1-(3-dimethylamino amino)-3-ethylenediamine hydrochloride, and N-hydroxythiosuccinimide, uniformly mixing, then adding gelatin, stirring, cleaning, freeze drying, and crushing, thus obtaining the gelatin compound.

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 discloses a preparation method of N-[3-(trimethoxy silicon substrate) propyl] n-butylamine. The preparation method comprises the following steps: (1) firstly adding n-butylamine and chloropropyl trimethoxysilane into a reaction kettle for stirring and reaction at 80 to 90 DEG C, thus obtaining a reaction solution containing N-[3-(trimethoxy silicon substrate) propyl] n-butylamine, n-butylamine hydrochloride and excessive n-butylamine; (2) then adding ethylenediamine at 40 to 80 DEG C, carrying out stirring for full replacement reaction of ethylenediamine and the n-butylamine hydrochloride to generate ethylenediamine hydrochloride, stewing the ethylenediamine hydrochloride at 40 to 70 DEG C in a heat preservation manner, and separating liquid, thus obtaining upper reaction liquid containing the N-[3-(trimethoxy silicon substrate) propyl] n-butylamine and n-butylamine and lower reaction liquid containing the ethylenediamine hydrochloride; (3) carrying out vacuum distillation on the upper reaction liquid obtained by liquid separation in the step (2), thus obtaining the N-[3-(trimethoxy silicon substrate) propyl] n-butylamine. The process of the preparation method disclosed by the invention is simple; the yield of an obtained product is 88 percent or more than 88 percent, and the purity is 99 percent or higher than 99 percent.

The invention discloses a laundry detergent with antibacterial effect, which comprises the following components in parts by weight: 10-15 parts of dodecyl dimethyl benzyl ammonium bromide, 5-10 parts of dioctadecyl 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, 80-10 parts of deionized water 95 servings. 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 preparation method of stable nitrite test paper, and the preparation method is characterized in that the method comprises the following steps: preparation of a soak solution: dissolving tartaric acid, sulfanilamide and N-(1-naphthyl) ethylenediamine hydrochloride in water to prepare the soak solution; preparation of test paper: soaking rapid quantitative filter paper in the soak solution for 2-5 minutes, taking out and drying, then soaking in a protective agent coating solution for 5-15 seconds, taking and drying immediately, wherein the prepared test paper is white; and preparation of a test strip: cutting the test paper into paper strips of 6mm, pasting the paper strips on a plastic plate by using glue or a double-sided adhesive tape, cutting the paper strips into test strips of 0.6 mm by using a paper cutter, and preserving the test strips in a dark place. The nitrite test paper provided by the invention has a nitrite detection range of 0-80mg / L, and is suitable for detecting nitrite in water bodies such as surface water, sewage and seawater. The test paper is good in stability and can be stored at normal temperature.

The invention provides a colorimetric detection method for nitrate in an explosive. According to the detection method, a detection reagent is prepared from N-1-naphthalene ethylenediamine hydrochloride, p-aminobenzenesulfonamide, hydrazine sulfate, water and phosphoric acid; and test paper is prepared by uniformly smearing filter paper with zinc powder, then dropwise adding a pressure-sensitive adhesive, collecting a sample by using a cotton swab, putting the sample on the test paper, dropwise adding the detection reagent to the test paper containing the sample, and determining the existence of nitrate by observing whether a rose red compound is generated or not. The detection method provided by the invention can be used for qualitative detection of nitrate in self-made explosives and explosive residues of the explosive in field explosion searching and explosion cases, and the detection limit can reach 100 mug. According to the method, a suspicious sample does not need to be dissolved,and the method has the characteristics of simplicity and rapidness in operation, strong specificity, sensitivity in reaction, convenience in use and low cost, and can provide an effective technical means for detection of explosion cases of criminal investigation departments of public security systems.