1648 results about "Ammonium acetate" patented technology

Provided herein are methods for producing alphavirus replicon particles in high yield; replicon RNAs are electroporated into permissive cells, where the cells are at a relatively high density, together with at least one helper nucleic acid providing the necessary functions for packaging. After a growth period in appropriate medium, alphavirus replicon particles are harvested from the surfaces of the cells in which they were produced using a salt wash in which the salt concentration is from about 0.2 to about 5 M sodium chloride, calcium chloride, magnesium chloride, potassium chloride, ammonium acetate, ammonium bicarbonate, among others. After dilution, if necessary, the particles can be purified by a suitable chromatographic technique.

The invention provides a boiler coal combustion-improving desulfurizing and denitrifying agent composition. The composition comprises the following raw materials in parts by weight: 2-7 parts of sodium carbonate, 1-3 parts of alumina, 2-8 parts of aluminium hydroxide, 2-5 parts of ferric trichloride, 2-6 parts of ferric oxide, 3-10 parts of potassium permanganate, 3-10 parts of potassium chlorate, 10-35 parts of activated attapulgite clay, 15-30 parts of urea, 2-4 parts of ammonium formate, 2-4 parts of ammonium chloride, 6-23 parts of ammonium acetate, 3-9 parts of manganese oxide, 9-12 parts of copper chloride, 1-3 parts of copper oxide, 2-4 parts of zinc sulfate, 1-3 parts of zinc nitrate, 7-18 parts of potassium dichromate, 1.0-1.5 parts of titanium dioxide, 0.5-1.0 part of barium molybdate, 0.5-1.5 parts of cobalt sulfate, 0.5-1.5 parts of vanadium pentoxide, 0.3-0.7 part of cerium oxide, 0.1-0.2 part of sodium dodecyl benzene sulfonate and 0.1-0.2 part of alkyl glyceryl ether. The composition is convenient to use, has stable properties, plays roles of combustion improving, desulfurization and denitrification, has coal saving rate of 8-25% and can remove fixed sulfur by 50-70%.

The invention relates to the field of molecular biology and discloses a kit and a method for extracting microbial DNA. The kit comprises lysis solution, inhibitor removal solution and binding solution, wherein the lysis solution comprises 50 to 200mM of Tris-HCl, 50 to 150mM of EDTA, 0.5 to 3M of NaCl, 0.5 to 2 percent of CTAB, 0.5 to 2 percent of PVP and 0.5 to 2 percent of SDS; the inhibitor removal solution comprises 100 to 300mM potassium acetate, sodium acetate or ammonium acetate and 50 to 200mM aluminum sulfate, ammonium sulfate or aluminum ammonium sulfate; and the binding solution comprises 3 to 6M guanidine hydrochloride, 10 to 50mM Tris-HCl and 5 to 50 percent isopropanol. The kit and the method for extracting the microbial DNA have the advantages of high purity, high universality, high extraction speed, direct use for a downstream experiment, and application to extracting DNA from a microbe-containing sample.

The invention relates to a method for measuring tobacco-specific nitrosamines (TSNAs for short) by using a super efficient liquid chromatogram-tandem mass spectrum combined method, and belongs to a method for detecting TSNAs. The method comprises the following steps of: adding internal standard-containing aqueous solution of ammonium acetate into a filter sheet after trapping smoke and cigarette filters smoked completely under standard conditions or tobacco shreds, performing ultrasonic extraction, transferring 1 to 2mL of extract into a small solid-phase extraction column taking N-vinyl pyrrolidone-benzene sulfonic acid copolymer as filler, flushing the small column by using aqueous solution of methanoic acid and methanol, finally eluting the small column by using solution of aqueous ammonia and methanol solution, analyzing the eluant by using an ultra performance liquid chromatography-mass spectrometer / mass spectrometer (UPLC-MS / MS), and quantifying according to the area ratio of a component peak to an isotope internal standard peak. The detecting method can be used for detecting the TSNAs in cured and hybrid cigarette mainstream smoke, cigarette side-stream smoke, filter tip intercepting smoke and tobacco shreds, and has the advantages of simple pretreatment, accurate quantification, high instrument analysis speed, low detection limit, high sample treatment flux and the like.

The invention relates to a screening method for 43 artificial synthetic pigments in an aquatic product. The method comprises the following steps: screening by virtue of quadrupole tandem time-of-flight mass spectrometry of liquid chromatogram; calling an established mass spectrometry screening database to automatically scan and retrieve in a molecular matching mode; through a C18 analytic column, carrying out gradient elution by taking an acetonitrile solution containing 0.1% of formic acid in a 5mmol / L ammonium acetate aqueous solution as a moving phase, wherein the flow rate is 0.3ml / minute; and detecting under a negative ion mode by using an electrospray ionization source, extracting a suspicious sample, purifying the sample by virtue of a matrix dispersion method, carrying out liquid chromatographic separation, quantitatively determining by virtue of an external standard method, and verifying. The screening method has the advantages that the detection method is simple and quick to operate and high in sensitivity. By adopting the matrix dispersion method to purify the sample, the interference of matrix components is effectively reduced. Misjudgment events such as false positive events are greatly reduced by virtue of the qualitative function of the quadrupole tandem time-of-flight mass spectrometry, so that the monitoring ability of the detection mechanism on the risk of the aquatic product is extremely enhanced.

The invention discloses a preparation method of a metal modified Y type molecular sieve. The preparation method comprises the following steps: (1) treating the Y type molecular sieve with an acid solution; (2) dehydrating the treated Y type molecular sieve; (3) then dissolving a compound of modified metal elements in a buffer solution of ethyl alcohol-ammonium acetate-water so as to prepare impregnation liquid, mixing and impregnating the impregnation liquid and the molecular sieve obtained in the step (1), and calcining. Wherein modified metal is one or more of Fe, Cr, Ga, In, Tl, Sn and Co. The metal modified Y type molecular sieve obtained by the method is high in hydrothermal stability, and the productive rate for gasoline by cracking hydrocarbon oil is high.

This invention provides a copper alloy having excellent stress relaxation resistance, comprising Ni: 0.1 to 3.0% (% by mass; the same shall apply hereinafter), Sn: 0.01 to 3.0%, and P: 0.01 to 0.3% with the balance consisting of copper and unavoidable impurities, characterized in that the content of Ni in an extraction residue after extraction separation on a filter having an opening size of 0.1 [mu]m by an extraction residue method is not more than 40% in terms of the proportion to the content of Ni in the copper alloy. In the extraction residue method, 10 g of the copper alloy is immersed in 300 ml of a methanol solution having an ammonium acetate concentration of 10% by mass. This copper alloy is used as an anode. On the other hand, platinum is used as a cathode. Galvanostatic electrolysis is carried out at a current density of 10 mA / cm<2>. A solution containing this copper alloy dissolved therein is subjected to suction filtration by a polycarbonate membrane filter having an opening size of 0.1 [mu]m, and the insolubles as the residue are separated and extracted on the filter. The content of Ni in the extraction residue is determined by dissolving the insolubles as the residue on the filter in a solution composed of a mixture of aqua regia and water at a ratio of 1 : 1, and then analyzing the solution by ICP emission spectrometry.

The invention provides a silicon-based electrode with an adjustable pore structure; the porosity of the silicon-based electrode is 30%-60%; the pore structure of the silicon-based electrode is adjusted by controlling the compaction density of the electrode and adding a pore-forming additive, wherein the pore-forming additive is one or more of ammonium carbonate, ammonium hydrogen carbonate, ammonium acetate, ammonium nitrate and ammonium chloride. The invention further provides a preparation method of the silicon-based electrode. The porosity of the electrode is controlled by changing the compaction density, and the appropriate porosity can be consistent with the volume expansion rate of a high specific capacity silicon carbon negative electrode material in a lithium intercalation state, so that the integrity of the structure is kept in the circulation process of the electrode; and the volume change of silicon can be effectively buffered through the high-capacity silicon-based negativeelectrode with the variable pore structure, so that the diffusion speed of lithium ions and electrons is increased, the cycling stability of the electrode is obviously improved, and the large-currentdischarge performance of the electrode is improved.

The invention relates to an Fe<3+> fluorescent probe and a preparation method thereof, particularly a bis-Schiff-base-connected symmetrical phenanthroimidazole Fe<3+> fluorescent probe and a preparation method thereof. The invention aims to solve the technical problems that the existing Fe<3+> fluorescent probe needs an organic solvent identification environment and copper ions can interfere with the identification of iron ions. The structural formula of the bis-Schiff-base-connected symmetrical phenanthroimidazole Fe<3+> fluorescent probe is disclosed in the specification. The preparation method comprises the following steps: 1. synthesizing an intermediate compound I from phenanthrenequinone, o-nitrobenzaldehyde, aniline and ammonium acetate; 2. synthesizing an intermediate compound II from the intermediate compound I, Raney nickel and hydrazine hydrate; and 3. synthesizing the Fe<3+> fluorescent probe from the intermediate compound II and terephthalaldehyde under acidic conditions. The Fe<3+> fluorescent probe can selectively identify Fe<3+> in a water-phase system within the wide pH value range of 1-9; the response time is 2 minutes; and when being used for Fe<3+> inspection, the Fe<3+> fluorescent probe has the advantage of no interference, and is convenient and quick.

The invention discloses a preparation method of hydroxyapatite / bagasse active carbon. The preparation method comprises the following steps: adding 250ml of 4.4mol / L ammonium acetate buffering solution into 250ml of 0.05mol / L-0.5mol / L of calcium acetate solution, uniformly mixing, then adding 10-60g of bagasse, electrically stirring, then carrying out ultrasonic oscillation for 30-60 minutes, and standing for 24-48 hours; under rapid stirring, adding 500ml of 0.015mol / L-0.15mol / L ammonium dihydrogen phosphate solution into a mixture of calcium acetate, ammonium acetate and bagasse, adjusting the pH value to be 7.5-8.0, and stirring for 10 minutes under the room temperature; heating to be 100 DEG C by adopting water bathing, reacting for 48-60 hours, and obtaining hydroxyapatite / bagasse mixed and suspended matter solution; naturally cooling, filtering, washing, and drying for 16 hours under the temperature of 70 DEG C to obtain hydroxyapatite / bagasse mixture; carrying out carbonization under the temperature of 450-650 DEG C, then grinding, and screening by a 100-mesh sieve. The preparation method disclosed by the invention is simple in process and low in cost; and the obtained product can be widely applied to the deep-treatment procedure of waste water containing cadmium and lead in an industrial and mining enterprise.

The invention discloses a method for preparing high-purity acetonitrile from acetic acid and ammonia by two steps, which comprises the following steps of: (1) neutralizing acetic acid and ammonia to generate ammonium acetate; (2) mixing aqueous solution of ammonium acetate and gaseous ammonia, preheating, and making the mixture enter a fixed bed reactor filled with a catalyst aluminium oxide for reaction to generate acetonitrile-containing mixed gas; and (3) continuously refining the mixed gas to obtain the acetonitrile. The 70 to 80 weight percent acetic acid is taken as a raw material, and the produced acetonitrile product has the advantages of less varieties and low content of impurities, high purity of over 99.9 percent, simple separation process, shorter flow, low energy consumption only about 40 percent of that of a byproduct method in unit product, and lower cost. The separation process is a physical separation method, and avoids generating a great amount of wastewater and waste gas in the chemical treatment process of the byproduct method. Meanwhile, a synthesis method is adopted, so the limitation that the yield is limited by a main product can be radically eliminated.

The invention relates to a neutral blockage removing agent composition used for a mechanical recovery well in an oilfield. The neutral blockage removing agent composition is prepared from the following components in parts by weight: 16-20 parts of polyepoxysuccinic acid amine, 7-12 parts of hydroxyethylidene dipllosphate sodium, 21-25 parts of divinyl pentaacetic acid amine, 20-25 parts of hydroxyl ammonium acetate, 12-16 parts of activated attapulgite, 21-25 parts of ammonium persulfate, 9-12 parts ofdicyclohexyl sulfobutanedioate sodium, 7-9 parts of butyl lactate, 0.2-0.3 part of vanadium pentoxide, 5-8 parts of straight chain sodium dodecylbenzenesulfonate, 10-14 parts of nitrilotriacetic acid sodium salt, 4-7 parts of urotropin and 0.1-0.3 part of glycerin fatty acid ester. The neutral blockage removing agent composition is suitable for scale removal and blockage removal of an oil pumping unit well and a screw pump well, can effectively control the reaction speed of the blockage removing agent and the scale of the oil pumping unit well and the scaled screw pump well, and prevent the falling-off of big scale residues to result in the secondary blockage of the mechanical recovery well and an oil recovery pump thereof, has high blockage removal speed, is neutral and is free of corrosion; the waste liquid for blockage removal does not need to be discharged onto the ground to be subjected to sewage treatment, the blockage removal time does not exceed 24 hours, and the effect of safe and corrosion-free blockage removal is achieved.

The invention relates to a preparing method of 2-methoxy imino group 2-furan ammonium acetate which comprises the following steps: (1) sodium nitrite reacts with acetate furan to generate furan keto acid by oximation, rearrangement and hydrolysis; (2) the furan keto acid is extracted; (3) condensation reaction is carried out on the furan keto and methoxy ammonium hydrochloride to generate 2-imino group 2-furan acetic acid; (4) the 2-imino group 2-furan acetic acid is extracted; (5) ammonia is introduced for salt formation to generate the 2-methoxy imino group 2-furan ammonium acetate; wherein, solvent adopted in the furan keto extraction of step (2) is butyl acetate. Under the same condition, the dissolution loss of the ethyl acetate in water is four times larger than that of the butyl acetate. With the butyl acetate being adopted as the solvent, the unit consumption is lowered by 50 percent, and the production cost is lowered. Furthermore, 58-60 DEG C of the reaction temperature for oximation is adopted by the invention, the production rate of furoic acid is smaller than 1 percent, and the product yield is improved greatly.

The invention discloses a preparation method of sitagliptin, comprising the following steps: reacting 2, 4, 5-trifluoro-phenylacetic acid with malonic cyclo (sub) isopropyl ester; reacting 3-oxo-4-(2, 4, 5-trifluorophenyl) methyl butyrate with ammonium acetate; reacting 3-amino-4-(2, 4, 5-trifluorophenyl) methyl crotonate with hydrogen; performing hydrolysis reaction to (R)-3-amino-4-(2, 4, 5-trifluorophenyl) methyl butyrate; and reacting (R)-3-amino-4-(2, 4, 5-trifluorophenyl) butyric acid with 3-(trifluoromethyl)-5, 6, 7, 8-tetrahydro-[1, 2, 4] triazol [4, 3-a] pyrazine hydrochloride to obtain sitagliptin. According to the invention, EE value greater than 90% is obtained through high-efficiency catalytic hydrogenation; sitagliptin is prepared by only five steps; yield is higher; technical conditions are mild; operations are simple; cost is low; and yield and purity of products are high.

The dyeing process for elastic polyester-polyurethane fabric includes one dyeing step and one reducing and cleaning step. The dyeing step using disperse dye, ammonium acetate and dyeing assistant is performed in certain bath ratio and at certain temperature. The reducing and cleaning step using sodium hydrosulfite, sodium hydroxide and cleaning assistant is performed in certain bath ratio. The dyeing process can dye polyester component well at low temperature dyeing condition, and has well dyeing on polyurethane component and high color fastness.

The present invention relates to liquid phase chromatography-tandem mass spectrometry process for detecting specific tobacco fume nitrosamine content. The detection process includes: trapping tobacco fume with filtering sheet, adding internal standard substances, vibration extracting the filtering sheet with citric acid-phosphate buffering solution and cyclohexane, concentrating the organic phase extracted liquid in N2 protection, acidifying with hydrochloric acid, phase separating, neutralizing water phase with alkali solution, transferring the water phase solution into reverse chemical bonded solid phase extracting column, leaching with polar organic solvent aqua, eluting with polar organic solvent aqua, concentrating elutent, and analyzing in LC / MS / MS instrument quantitatively based on the area ratio between the component peak and the internal standard substance peak. The present invention has high repeatability, high recovering rate and low detection limit.

The invention discloses a method for purifying sermaglutide. The method comprises the following steps that in the first step, a sermaglutide crude product is pre-treated, and a sermaglutide crude peptide aqueous solution is obtained; in the second step, a tetralkylsilane bonded silica gel filler serves as a fixed phase, phosphoric acid serves as a mobile phase A, acetonitrile serves as a mobile phase B, and first HPLC (high performance liquid chromatography) purification is conducted so as to remove impurities of sermaglutide segment; in the third step, a solvent is removed, and a first step sample solution of sermaglutide is obtained; in the fourth step, an octane silane bonded silica gel filler serves as a fixed phase, an ammonium acetate solution serves as a mobile phase A, acetonitrileserves as a mobile phase B, and secondary HPLC purification is conducted so as to remove impurities having the similar physical and chemical properties as sermaglutide; and in the fifth step, the solvent is removed to obtain a second step sample solution of sermaglutide, and a sermaglutide sample solution is obtained. HPLC purification is conducted twice, the purity of the sample obtained in thefirst HPLC purification process and the secondary HPLC purification process is 92% and 99% respectively, and thus the purity and the yield of semaglutide are improved.

A post-dry etching cleaning liquid composition for cleaning a substrate after dry etching is provided, the cleaning liquid composition containing at least one type of fluorine compound, glyoxylic acid, at least one type of organic acid salt, and water. With regard to the fluorine compound, ammonium fluoride may be used. With regard to the organic acid salt, at least one of ammonium oxalate, ammonium tartarate, ammonium citrate, and ammonium acetate may be used.

The invention belongs to the technical field of catalyst, and in particular relates to a method for preparing SO4 / SnO2-M2O3 solid super acidic catalyst and an application thereof. In the invention, the coprecipitation method is adopted to prepare and obtain two-spot mixed hydroxid precursor comtaining Sn and M (M=Ga, Al or Fe); ammonium acetate solution washing, dilute sulphuric acid soaking and high temperature roasting are carried out on the precursor to obtain the solid super acidic catalyst. The catalyst, applied to reaction of lauric acid esterified compound biodiesel, achieves good effect, the esterification rate is high and the reaction conditions are moderate.

The invention relates to a method for simply, conveniently and accurately measuring the contents of ferrous, ferric iron and total iron in seawater by utilizing a spectroscopic luminosity technology. The method comprises the following steps: fixing the ferrous and ferric iron in seawater sample, regulating the PH to slant acidity; taking ferrozine mono-sodium salt as a color reagent, setting the absorbance of a blank control solution the salinity and the PH of which are consistent with the seawater sample to be zero, and then measuring the absorbance of a standard solution and the seawater sample; adding a hydroxylamine hydrochloride solution into the blank solution, the standard solution and the seawater sample to completely reduce the ferric iron in the seawater, adding an ammonium acetate buffer solution, setting the absorbance of the blank control solution to be zero, and measuring the absorbance of the standard solution and the seawater sample; repeating the step of reduction, adding ammonium acetate buffer solution, setting the absorbance of the blank control solution to be zero, and measuring the absorbance of the standard solution for the third time; and finally, calculating the contents of the ferrous, the ferric iron and the total iron in the seawater sample, thus the problem of application restriction of the spectroscopic luminosity technology in measuring the content of iron in the seawater is solved.

The invention provides an impurity-inhibiting leaching method for inhibiting leaching of aluminum during weathering crust eluvial type rare earth ore leaching process. The method comprises that acetates are added in an ore leaching solution, the ore leaching solution is an ammonium sulfate solution or an ammonium chloride solution or a composite ammonium salt solution composed of the above solutions, the acetates are any one of ammonium acetate, sodium acetate and potassium acetate or any mixture thereof, and the addition amount of the acetates in the ore leaching solution is 0.005wt%-2wt%. In the method, the addition of the aluminum inhibitors can lower the aluminum ion content in the rare earth leaching solution by above 91% effectively, and has no influence on the leaching rate of rare earth, which are beneficial to subsequent processing of the rare earth mother solution. The addition of the aluminum inhibitors can inhibit expansion of clays well. The acetates are non-poisonous and the cost is low.

The invention discloses a tandem mass spectrum detection kit capable of simultaneously measuring 16 types of bile acid. The kit comprises a standard substance, a quality control substance, an interiorlabel substance, precipitant, diluent and a flowing phase, wherein the precipitant is at least one of methyl alcohol, ethyl alcohol and acetonitrile; the diluent consists of water, methyl alcohol, ethyl alcohol and acetonitrile, wherein the volume ratio of water, methyl alcohol, ethyl alcohol to acetonitrile is (1-50):(0-90):(0-50):(0-50), and methyl alcohol, ethyl alcohol and acetonitrile are not zero at the same time; and the flowing phase comprises a flowing phase A and a flowing phase B, wherein the flowing phase A is the aqueous solution of ammonium formate or ammonium acetate-methanoicacid or acetic acid, and the flowing phase B is methyl alcohol and / or acetonitrile. The invention also discloses the application of the tandem mass spectrum detection kit. The tandem mass spectrum detection kit disclosed by the invention has the characteristics of high sensitivity, good specificity and the like, can accurately, simply and quickly simultaneously detect 16 types of bile acid in a matrix, and has a high application value.

The invention relates to a detection method of vitamin in food, in particular to a method for detecting biotin content in the food by using ultra-high performance liquid chromatography-triple quadrupole tandem mass spectrometer. The method comprises a sample pre-treatment method, ultra-high performance liquid chromatography detection, and tandem mass spectrometric detection step, and comprises the following steps: separating by using HSS T3 liquid chromatographic column, performing gradient eluting by using 10mmol / L ammonium acetate buffer solution (containing 0.1% formic acid) and acetonitrile as mobile phases, and performing qualitative and quantitative analysis by using electron spray-positive ion ionization source multi-reaction monitoring mode. The result is that the method quantitation limit of the biotin (VB7) is 0.6 microgram / 100g, the recovery rate is 81.3%, relative standard deviation is 5.5%, and the linear range is 0.2-10ng / mL. The method is simple in analysis operation, fast, high in sensitivity, good in repeatability, and suitable for quantitatively detecting the biotin in milk powder.

The invention belongs to the field of chemical drugs, and discloses a ruthenium complex capable of inhibiting tumor angiogenesis and a preparation method and application thereof. The ruthenium complex provided by the invention has a structure shown in a formula I or II. The preparation method comprises the following steps of: dropwise adding a silver nitrate solution to a sodium salt solution, stirring and reacting, then filtering, washing and vacuum drying a precipitate, and thereby obtaining a ligand O-O; taking ruthenium chloride, L, and lithium chloride to be dissolved in N-, N-dimethyl formamide, heating and refluxing under the protection of argon atmosphere to obtain an intermeidate Ru (L2) Cl22 +; allowing the ligand O-O and the Ru (L2) Cl22 + to be dissolved in an ethanol / water mixed solvent, heating and refluxing to obtain the ruthenium complex shown in the formula I; and allowing the Ru (L2) Cl22 +, 8- hydroxyquinoline, and ammonium acetate to be dissolved in ethanol, and heating and refluxing under the protection of argon atmosphere to obtain the ruthenium complex shown in the formula II. The ruthenium complex has the advantages of good stability, uneasiness in hydrolysis, good solubility, low toxicity, and the ability to inhibit tumor angiogenesis, and is easily absorbed by the human body.

The invention relates to a preparation method of novel biochar, which comprises following steps: (1) crushing plant straws into powder, soaking the plant straws and soaking the plant straws in an ammonium acetate water solution at normal temperature, and cooking the plant straws in a mixed liquid prepared from oxalic acid, sodium nitrate, tannin acid and water; (2) washing filter residue in clear water to remove acid on surface of the plant straw powder; (3) cooking the filtrate; (4) mixing a solid substance obtained in the step (3) with carbon powder according to the weight ratio of 100:2.5 uniformly and performing high-temperature treatment; (5) mixing the treated raw materials with activated charcoal according to the weight ratio of 60:2 uniformly, and performing carbonization treatment with nitrogen gas filled into a quartz tube continuously so that the nitrogen gas is circulated in the quartz tube to prepare the biochar. The method for producing the biochar can reach more than 64.5% in carbonization rate of the plant straws, and is reduced by about 10% in energy consumption during the process.

The invention provides a determination method by liquid chromatography-electrospray mass spectrometry (LC-ESI-MS / MS) for detecting various phthalate esters in milk simultaneously, belonging to the field of food detection technology. The milk sample is directly extracted by acetonitrile and sodium chloride; a formic acid ammonium acetate solution-carbinol system is taken as a flowing phase for liquid chromatography separation so as to carry out gradient elution; and the quantitative detection is carried out by a mass spectrum detector by adopting the peak area method of an external standard method. The method has high sensitiveness, good exactness and preciseness, reliable specialization and authenticity, is extremely simple and convenient and easy to be applied to practical detection, and can meet the requirement in practical detection excellently.

The invention provides a method for rapid detection of multi-class pharmaceutical and personal care products and pesticides in water. The method includes: taking a to-be-detected water sample, and subjecting the to-be-detected water sample to pretreatment to obtain a to-be-detected sample; employing one or more groups of the following five groups of detection conditions for liquid chromatography-tandem mass spectrometry detection on the to-be-detected sample respectively so as to realize qualitative analysis and quantitative detection of multi-class pharmaceutical and personal care products and pesticides in the to-be-detected water sample: (a) the mobile phase is a formic acid-ammonium formate aqueous solution and acetonitrile, and the ionization mode is electrospray ionization positive mode; (b) the flow phase is a formic acid aqueous solution and acetonitrile, and the ionization mode is electrospray ionization positive mode; (c) the mobile phase is an acetic acid-ammonium acetate aqueous solution and acetonitrile, and the ionization mode is electrospray ionization negative mode; (d) the mobile phase is water and acetonitrile, and the ionization mode is electrospray ionization negative mode; and (e) the mobile phase is a formic acid-ammonium formate solution and acetonitrile, and the ionization mode is electrospray ionization positive mode.

The invention discloses a liquid reagent for determining N-acetyl-beta-D-glucosaminidase, which takes 5-(4-(3-methoxyl-phenylmethene-)-rhodanine-3-qmmonium acetate-N-acetylamino-beta-D-glucoside as substrate and is prepared by adding proper buffer solution, surfactant, preservative, stabilizer and the like. The liquid reagent has the advantages of large solubility of the substrate, strong stability, high detection sensitivity, convenient clinical detection, low detection cost and small outside interference for the detection result of N-acetyl-beta-D-glucosaminidase.

The invention belongs to the technical field of metal materials and in particular relates to a preparation method of a high-performance steel and iron material additive-vanadium nitride. According to the technical scheme, the method comprises the following steps: preparing vanadium nitride by adopting a liquid-phase solvothermal method, wherein a liquid phase adopts a water solution or an alcohol solvent; a vanadium source is selected from bivalent, trivalent or tetravalent chloride of vanadium, sulfate, nitrate and acetate; and a nitrogen source is selected from ammonia gas, urea, hydrazine, ammonium chloride, ammonium carbonate, ammonium acetate and ammonium sulfate. According to the method, carbon or hydrogen does not need to be adopted as a reducing agent in the preparation process, so that the discharge of greenhouse gas in the preparation process is avoided and the impurity carbon element in vanadium nitride is eliminated; the alloy synthesis temperature is lower than 400 DEG C; and the nitrogen content of vanadium nitride synthesized by adopting the method maximally and theoretically can be 21%.