239 results about "Ammonium acetate" patented technology

The present invention relates to the technical field of antibiotic production, and in particular to a dalbavancin intermediate A40926 and a separation and purification method thereof, comprising the following steps: S1, filtering a fermentation broth containing the dalbavancin intermediate A40926 to obtain a collected liquid; S2, adsorbing the collected liquid through a macroporous adsorption resin, eluting with ethanol, and collecting an eluate a having an A40926 unit greater than 100 mg / L; S3, ultrafiltrating and concentrating the eluate a to obtain a concentrated liquid having an A40926 unit of 15,000 to 16,000 mg / L; S4, subjecting the concentrated liquid to a chromatography exchange resin, top-washing with pure water, and gradient eluting with an ammonium acetate-ethanol solution, to collect an eluate b having an A40926 purity greater than 95%; S5, adjusting the pH of the eluate b to 8.0±0.2, adding acetone, adjusting the feed liquid temperature to 2 to 8°C, stirring for 6 to 7 hours, performing crystallization, and filtering and drying to obtain the dalbavancin intermediate A40926.

< TableDetails num = '0001' > < Title / > < tbl: tgroup cool = '2' > < tbl: colspec cool = 'c001' cool width = '50%' / > < tbl: colspec cool width = 'c002' cool width = '50%' / > < tbl: cool width = '1' > impurity < / tbl: cool > < tbl: cool width = '1' > HPLC percentage content < / tbl The mobile phase B is a 8mmol / L ammonium acetate solution, and the solvent is a mixed solvent of acetonitrile and water in a volume ratio of 95: 5; and carrying out gradient elution at a flow rate of 1.0 ml / min.

The invention provides a method for detecting a genotoxic impurity TG707 in a macassavir raw material medicine and an intermediate TG7, and relates to the technical field of medicine detection, and the method comprises the step of detecting the genotoxic impurity TG707 in the macassavir raw material medicine or the intermediate TG7 sample by adopting a high performance liquid chromatography and mass spectrometry combined method, the mobile phase A is an ammonium acetate solution, and the mobile phase B is methanol. By adopting a liquid chromatography-mass spectrometry method and utilizing the selectivity of mass spectrum multi-channel monitoring, main components and impurities enter mass spectrum at the same time, the interference of high-concentration main components on the mass spectrum detection sensitivity is avoided, good separation on the mass spectrum is realized, and the sensitivity is relatively high; an ammonium acetate solution and methanol are used as mobile phases, so that the peak pattern and sensitivity of TG707 are ensured. The technical problems that in the prior art, the peak of TG707 on a liquid phase is between two peaks of a main component TG7, and baseline separation is difficult to achieve by replacing a chromatographic column and optimizing the fluidity gradient are solved.

< TableDetails number = '0001' > < Title / > < tbl: tgroup cool = '2' > < tbl: colspec cool = 'c001' cool = '46%' / > < tbl: colspec cool = 'c002' cool = '54%' / > < tbl: cool > < tbl: cool = '1' > impurity < / tbl: cool > < tbl: cool = '1' > HPLC percentage content < / tbl The mobile phase B is a 8mmol / L ammonium acetate solution, and the solvent is a mixed solvent of acetonitrile and water in a volume ratio of 95: 5; and carrying out gradient elution at a flow rate of 1.0 ml / min.

The invention relates to the technical field of food safety detection, in particular to a method for detecting urea in bean sprouts and application thereof.The method comprises the following steps that smashed bean sprouts are subjected to two times of ultrasonic extraction and centrifugation, supernate is combined, and an extracting solution is obtained; fixing the volume and filtering to obtain a to-be-detected solution; detecting the liquid to be detected by using liquid chromatography-tandem mass spectrometry; an extraction solvent for ultrasonic extraction is a 5% formic acid-acetonitrile composite solution; the conditions of the liquid chromatography-tandem mass spectrometry are as follows: the chromatographic conditions are as follows: a chromatographic column is an HILIC column; the sample size is 10 [mu] L; a mobile phase is a mixed solution of a 0.02 mmol / L ammonium acetate buffer salt solution and acetonitrile, and isocratic elution is carried out; the flow rate is 0.3 mL / min; the column temperature is 40 DEG C; mass spectrum conditions are as follows: an electrospray ionization (ESI) positive ion mode, electrospray voltage of 4000 V, sheath gas pressure of 30 psi, auxiliary gas pressure of 5 psi, capillary heating temperature of 300 DEG C and scanning mode of MRM. The method disclosed by the invention is free from substance interference, high in sensitivity, accurate in result, low in cost and high in efficiency, and can be used as a standard detection method.

The present invention provides a lead-acid battery repair fluid, and its preparation and use methods. The repair fluid comprises the following raw materials: MXene, ammonium acetate, ammonium bicarbonate, sodium ethylenediaminetetraacetate (EDTA), montmorillonite, polymaleic anhydride, sodium polystyrene sulfonate, chloroethyl polyvinylpyridinium salt, polyvinylpyrrolidone (PVP), sodium alginate, and deionized water. The repair fluid can effectively dissolve lead sulfate crystals and form a durable and stable protective film on the electrode plates, thereby regenerating the lead-acid battery while effectively preventing further lead sulfate crystals from adhering to the electrode plates, thereby increasing the battery's service life. Furthermore, the raw materials used in the present invention are safe and harmless to the human body, and the preparation method is simple, efficient, and environmentally friendly.

The invention discloses a phototherapy reagent and a preparation method and application thereof. The preparation method comprises the following steps: 1-[4-(diethylamino) phenyl]-ethane-1-ketone and 4-methoxybenzaldehyde are subjected to a condensation reaction in a NaOH ethanol solution, and a product and nitromethane are subjected to addition; performing condensation and addition on the other groups of raw materials by the same method; cyclizing the two addition products with ammonium acetate, and coordinating with boron trifluoride diethyl etherate to obtain NHM; carrying out substitution reaction on the NHM and sodium nitrite to obtain NOO; and oxidizing NOO by m-chloroperoxybenzoic acid to obtain NNOO. The reagent can target a tumor hypoxia microenvironment, hypoxia monitoring is achieved, NO is released through photostimulation for tumor gas therapy, meanwhile, the secondary amplification photo-thermal therapy effect is achieved, preparation is controllable, diagnosis and treatment are integrated, and the reagent is sensitive, safe and suitable for biomedical research and clinical diagnosis.

The invention relates to the technical field of biological detection, in particular to a composition for protein precipitation, a protein precipitation agent containing the composition, a protein precipitation combined product, a detection kit and a preparation method and a detection method of a blood analysis sample. The composition for protein precipitation comprises zinc sulfate and ammonium acetate in a dosage ratio of (5-17) mg: (0.5-1) mmol. Compared with the prior art, the composition has the following beneficial effects that the zinc sulfate and the ammonium acetate are matched according to a specific proportion, so that the specific composition is formed, and hemoglobin in a blood sample can be effectively removed by taking the composition as a protein precipitation component.

The invention discloses a method for simultaneously determining N-sodium laureth sarcosinate and phenol red residues in an injection based on a UPLC-MS / MS (Ultra Performance Liquid Chromatography-Mass Spectrometry / Mass Spectrometry) method. According to the method, on the basis of an ultra-high performance liquid chromatography-tandem triple quadrupole mass spectrometer, a 5mM ammonium acetate solution (containing 10% acetonitrile) is taken as a phase A, a 0.2% acetic acid acetonitrile solution is taken as a phase B, a Waters Acquity UPLCBEH C18 column is selected, ESI is taken as a mass spectrometry detection ion source, and the two process residues in the injection are accurately quantified at the same time in a negative ion scanning and multi-reaction monitoring mode. The method is simple in pretreatment, high in detection sensitivity and good in reproducibility, and can be used for corresponding injection process residue identification and quality control.

The application discloses a detection method and application of a fingerprint spectrum and a mark characteristic effective component of compound tung oil for burns and a detection method of the fingerprint spectrum, and the detection method of the fingerprint spectrum comprises the following steps: preparing a sample solution and a standard control solution of the compound tung oil for burns, and adopting HPLC chromatography to construct the fingerprint spectrum of the compound tung oil for burns; the HPLC chromatography conditions for constructing the fingerprint spectrum of the compound tung oil for burns comprise the following steps: adopting an octadecyl silica water-resistant analysis column chromatographic column, adopting methanol (A) and 0.08-0.12% ammonium acetate (B) as a mobile phase, adopting a flow rate of 0.5-0.7 mL / min, and adopting a sample injection amount of 5-15 muL. The method system is reliable in results and provides a scientific screening method for quality control of the compound tung oil for burns.

The invention belongs to the technical field of glycine preparation, and particularly discloses a preparation method of glycine. The method comprises the following steps: controlling the reaction temperature, efficiently synthesizing ammonium chloroacetate from chloroacetic acid and liquid ammonia in a reactor, carrying out catalytic ammonolysis on the ammonium chloroacetate and ammonia gas in a reactor filled with a solid catalyst to realize continuity and reinforcement of the process, and carrying out alcohol precipitation crystallization, separation and purification to obtain glycine. The solid catalyst provided by the invention has the advantages of simple preparation, reproducibility, long service life, no metal pollution, easily available raw materials, controllable cost, long-acting cyclic utilization, high efficiency, simple recovery and the like; the method for preparing glycine by using the solid catalyst solves the problems of high consumption, high recovery cost, low production and purification efficiency and pollution caused by the traditional catalyst, and is a key technology for green and low-cost industrial production of glycine.

The invention discloses an in-situ leaching liquid injection system and method for high-altitude ionic rare earth ore, and belongs to the field of rare earth hydrometallurgy. The system is composed of a liquid injection well pattern, a layered liquid injection device, a first liquid supply system, a second liquid supply system and a collection system. Exploring the thickness of an ore body weathering crust and vertical distribution of rare earth / impurities; the liquid injection hole is vertically divided into an upper layer liquid injection area (1 / 3-1 / 2 of the upper part) and a lower layer liquid injection area (1 / 2-2 / 3 of the lower part); a 1.0-1.4 wt% low-concentration diethylenetriamine-ammonium acetate composite leaching agent is injected into the upper layer, and co-leaching of impurities such as aluminum and iron is reduced; 1.5-2.5 wt% of high-concentration diethylenetriamine-ammonium acetate composite leaching agent is injected into the lower layer to ensure efficient leaching of rare earth; and rare earth-rich leaching liquid is collected. Compared with a traditional full-layer high-concentration process, the method has the advantages that the use amount of a leaching agent is reduced by 20-40% while the rare earth leaching rate is kept to be larger than or equal to 90%, the aluminum ion concentration of the leachate is reduced by 30-60%, the agent cost and the follow-up impurity removal load are remarkably reduced, and the method is particularly suitable for the high-altitude, low-temperature, low-air-pressure and thick-weathered crust environment.

FIELD: pharmacology.SUBSTANCE invention can be used to determine the concentration of an anti-tuberculosis drug in blood serum. The method for determining the concentration of bedaquiline in the blood serum in patients with tuberculosis or mycobacteriosis is that whole blood samples are centrifuged at 3000 rpm for 20 minutes, then the blood plasma is collected in sterile 1.5 mL Eppendorf tubes, then 900 mcL of acetonitrile are added to 300 mcL of plasma and centrifuged at 13500g for 15 minutes, then 1 mL of the supernatant is transferred to a chromatographic vial and make the assay by UHPLC MS / MS using an Athena UHPLC C18, 1.8 mcM, 120A, 2.1×100 mm chromatography column, when using an aqueous solution containing 5 g / L of ammonium acetate, 25 ml / L of concentrated acetic acid, 2 ml / L trifluoroacetic acid as mobile phase A and 100% acetonitrile as mobile phase B, the concentration of bedaquiline is determined using a pre-plotted calibration curve.EFFECT: determination of bedaquiline in human blood plasma in a time not exceeding 6 minutes.1 cl, 9 dwg, 6 tbl

The invention discloses a method for detecting 5 '(E)-VPA phosphoramidite monomer related substances, and belongs to the technical field of liquid chromatography detection. Related substances comprise 5 '-(E)-VP-2'-OMe-A (Bz), 5 '(Z)-VPA, 5'-(E)-VP-2 '-OMe-A-CE-P and 5' (E)-VPA-OX, and chromatographic detection conditions comprise that the column temperature is 23-27 DEG C, a stationary phase of a chromatographic column is octadecyl bonded silica gel, a mobile phase A is an ammonium acetate solution, a mobile phase B is acetonitrile, gradient elution is performed, and the like. According to the method, four related substances in the 5 '(E)-VPA phosphoramidite monomer are effectively separated through specific liquid chromatography conditions, the system adaptability, specificity, linearity and range, detection limit, quantitation limit and accuracy verification of the method all meet acceptable standards of pharmacopoeia, and detection of multiple related substances can be completed within a short time; and a reliable means is provided for detecting and controlling the quality of the 5 '(E)-VPA phosphoramidite monomer.

This invention relates to the field of high-purity material analysis technology, and discloses a method for simultaneously separating and enriching copper, cadmium, nickel, cobalt, zinc, lead, and barium in lithium carbonate. The steps are as follows: dissolving a lithium carbonate sample in nitric acid to obtain an acidified sample solution; adjusting the acidified sample solution to an alkaline pH range of 9.5-10.5 using an ammonia-ammonium acetate alkaline buffer solution; passing the alkaline solution through a solid-phase extraction column filled with iminodiacetic acid-type chelating resin, where copper, cadmium, nickel, cobalt, zinc, lead, and barium ions are selectively adsorbed onto the resin; and eluting the adsorbed heavy metal ions with acid to achieve separation and enrichment. This invention effectively overcomes the inhibition and interference of the lithium carbonate matrix on the detection of trace heavy metals, and in particular significantly improves the adsorption and recovery rate of elements such as barium. It achieves efficient separation and enrichment of multiple heavy metals in complex matrices, providing a reliable pretreatment solution for high-sensitivity and high-accuracy quality control analysis of lithium carbonate products.

The application discloses a kind of belongs to analytical detection technical field, specifically related to a kind of determination method of etomidate content in electronic cigarette oil, comprising the following steps: using step-by-step dilution method to pretreat the electronic cigarette oil to be measured to obtain test sample;Using high performance liquid chromatography tandem mass spectrometry technique to determine the content of etomidate in the test sample;The chromatographic conditions in the high performance liquid chromatography tandem mass spectrometry technique include: chromatographic column: n-octadecyl column;Mobile phase A phase: 4mmol / L-6mmol / L ammonium acetate+0.05% (v / v)-0.15% (v / v) formic acid aqueous solution;Mobile phase B phase: methanol.The determination method of etomidate content in the electronic cigarette oil can not only greatly save the solvent usage amount, but also can ensure the accuracy of detection, reduce the influence of matrix effect.

The invention discloses a method for determining barium sulfate in fluorite mine. The method comprises hydrochloric acid, nitric acid, hydrofluoric acid, sulfuric acid-hydrochloric acid mixed acid, ammonium acetate and sulfuric acid. The determination method of barium sulfate in fluorite mine comprises the following steps: S1, reagent proportioning; s2, selecting an instrument; s3, preparing a sample; s4, step analysis; s5, calculating a result; and S6, matters needing attention. The invention belongs to the technical field of mineral composition analysis, and particularly relates to a method for measuring barium sulfate in fluorite mine, which comprises the following steps: firstly, treating a sample with hydrochloric acid, nitric acid and hydrofluoric acid, evaporating to be nearly dry, dissolving soluble salts with a hydrochloric acid-sulfuric acid mixed solution, then filtering, burning filter residues, and finally weighing to obtain the weight of barium sulfate. The method is simplified and optimized on the basis of a national standard method, the method is convenient and fast to operate, the time is greatly shortened, and the result is stable. The method is suitable for the fields of mine production, laboratory rapid detection and the like.

The invention discloses an imidazolyl BODIPY derivative viscosity fluorescent probe with an aggregation-induced fluorescence enhancement (AIEE) effect and application thereof, the imidazolyl BODIPY derivative viscosity fluorescent probe is realized by the following method: taking a 2-formaldehyde BODIPY derivative (I), diphenyl ethanedione and aniline as raw materials, and carrying out Debus-Radziszewski imidazole synthesis reaction under the catalytic action of ammonium acetate, and the chemical structural formula of the imidazolyl BODIPY derivative viscosity fluorescent probe is as shown in formula (II). The preparation method is simple in reaction step, mild in reaction condition, simple and convenient to separate and purify and high in yield; the fluorescent probe has an aggregation-induced fluorescence enhancement effect, has high responsiveness to viscosity, can be used for detecting viscosity change in a solution and cells, and can provide an effective detection method for researching physiological action of viscosity in cells.

The invention belongs to the technical field of vitamin content detection, and particularly relates to a method for measuring the content of various water-soluble vitamins B. The water-soluble vitamins B comprise vitamin B1, vitamin B2, vitamin B3, vitamin B6, vitamin B7, vitamin B12 and nicotinamide. A high performance liquid chromatograph and an electrospray detector are used as detection instruments, and chromatographic conditions are as follows: a mobile phase A is ammonium formate or ammonium acetate, a mobile phase B is methanol, and gradient elution is performed; the gradient elution procedure is as follows: a solvent of a test sample is a mixed solution of acetonitrile, water and glacial acetic acid, and the volume ratio of the acetonitrile to the water to the glacial acetic acid is 5: 95: 0.5; the atomization temperature of the electrospray detector is 35 DEG C; the method is better in separation degree and higher in specificity and sensitivity.

The invention discloses a method for sequentially extracting forms of heavy metals in an organic fertilizer, which comprises the following steps: (1) mixing the organic fertilizer with a magnesium chloride solution, and separating to obtain a first filtrate and a first residue; (2) mixing and separating the first residue and an acetic acid-sodium acetate buffer solution to obtain a second filtrate and a second residue; (3) mixing and separating the second residue and a sodium pyrophosphate solution to obtain a third filtrate and a third residue; (4) mixing and separating the third residue and the hydrogen peroxide and nitric acid solution, and mixing and separating the obtained residue and an ammonium acetate solution to obtain a fourth filtrate and a fourth residue; (5) mixing and separating the fourth residue and a hydroxylamine hydrochloride solution to obtain a fifth filtrate and a fifth residue; (6) mixing the fifth residue with aqua regia, and filtering to obtain a sixth filtrate; (7) mixing the organic fertilizer with aqua regia, and filtering to obtain a seventh filtrate; and (8) detecting the contents of heavy metal elements in the first filtrate, the second filtrate, the third filtrate, the fourth filtrate, the fifth filtrate, the sixth filtrate and the seventh filtrate.

The invention relates to the technical field of catalytic materials, and discloses a silver cluster-based metal-covalent organic framework material as well as a preparation method and application thereof. The silver cluster-based metal-covalent organic framework material provided by the invention is a crystalline metal-covalent organic framework material with a two-dimensional laminated structure and a pore channel structure, and has a pyrazole ring trinuclear silver complex group provided by a pyrazole ring trinuclear silver complex monomer and an imidazole linking group formed by condensation of a pyrene monomer and ammonium acetate. The two forms double active sites, and the pyrene monomer endows the material with light absorption capacity, so that the material has the potential of being used as a multi-active-site photocatalyst; the preparation method of the material is simple in step, mild in reaction condition and suitable for industrial application; the silver cluster-based metal-covalent organic framework material can be used for preparing ethylene through photocatalytic acetylene reduction, has the advantages of high ethylene yield, good material stability, continuous catalysis capability and inactivation resistance, is beneficial to promoting green synthesis of ethylene, and meets the industrial requirements of ethylene.

This invention discloses a photoelectrocatalyst and its preparation method, wherein the photoelectrocatalyst comprises Zn 2+ Ce 4+ Au; Zn 2+ Including ammonium acetate, zinc nitrate, and hexamethylenetetramine; Ce 4+ Including cerium nitrate, ammonium chloride, and potassium chloride; Au includes PVP, sodium citrate, potassium bromide, and chloroauric acid; Zn 2+ Ce 4+ The molar ratio of Au to Zn is... 2+ Ce 4+ Au = 1:0.5 ~ 1:2.5 * 10 ‑7 ~7.5*10 ‑7 This method uses electrodeposition to prepare ZnO as a substrate. Its vertically aligned one-dimensional (1D) nanostructures exhibit quantum size-dependent effects, effectively shortening the carrier diffusion distance. CeO2 coats the ZnO, forming a stable, acid- and alkali-resistant substrate material. CeO2 traps electrons from Ce... 4+ Restored to Ce 3+ This forms oxygen voids and Ce 3+ / Ce 4+ Electron pairs produce high catalytic activity.

The application relates to the field of catalysts, and discloses a Cu-SSZ-13 molecular sieve catalyst with high-temperature sulfur resistance and a preparation method and application thereof. The preparation method comprises the following steps: dissolving ammonium acetate in deionized water, putting into H-type SSZ-13 molecular sieve for ion exchange, drying the obtained product after suction filtration, and obtaining NH4-type SSZ-13 molecular sieve; putting the NH4-type SSZ-13 molecular sieve into a copper acetate monohydrate solution for ion exchange, using acetic acid to control the pH during the ion exchange process; and suction filtering, drying and calcining the obtained product to obtain the Cu-SSZ-13 molecular sieve catalyst with high-temperature sulfur resistance. The application takes the H-type SSZ-13 molecular sieve as raw material, carries out twice ion exchange under the condition of controlling the acidity and alkalinity, controls the copper species into divalent copper ions in the obtained catalyst, and has obvious advantages in the high-temperature window in terms of the sulfur resistance.

The application discloses a method for simultaneously detecting 18 kinds of amino acids in Daqu based on high-resolution liquid chromatography-mass spectrometry, and belongs to the technical field of liquor detection. Chromatographic conditions of the method include that an ethylene bridge hybrid particle with surface-bonded amide groups is used as a filler, ammonium acetate-formic acid aqueous solution is used as mobile phase A, and acetonitrile is used as mobile phase B for gradient elution; mass spectrometry conditions include that an H-ESI ion source is used, the spray voltage in the positive ion mode is 3000-4000 V, and the spray voltage in the negative ion mode is 2000-3000 V; qualitative analysis is performed according to mass-to-charge ratios of the 18 kinds of amino acids, and quantitative analysis is performed by using a standard curve method. The method has the characteristics of simple pretreatment operation, easy-to-obtain reagents, high extraction efficiency and good stability, can realize synchronous and accurate qualitative and quantitative analysis of the 18 kinds of amino acids, and provides reliable data support for flavor substance research of Daqu.

The invention relates to a preparation method of tetramethylpyrazine, which is characterized in that 3-hydroxy-2-butanone and ammonium acetate are used as raw materials, a potassium hydrogen persulfate compound (Oxone) is used as an oxidizing agent, and 2, 3, 5, 6-tetramethylpyrazine is prepared through reaction. The preparation method has the beneficial effects that the reaction is rapid, the condition is mild, an organic solvent is not needed, and industrial popularization is easy; the color of a reaction system solution in the reaction process is light, and the reaction solution can be used mechanically, so that the green, environment-friendly and safe production and purification processes of the product are realized; the prepared product can be directly obtained in a filtering mode, and the product is high in purity, good in appearance, high in yield and suitable for one-pot production.

The invention provides a method for detecting forskolin, Y-27632 and AM2394 in cell culture biomass and a culture solution, and relates to the technical field of food detection. The detection method comprises the following steps: detecting target objects in cell culture biomass and a culture solution by using an ultra-high performance liquid chromatography-tandem mass spectrometry, and controlling a mobile phase A to be ultrapure water, formic acid and ammonium acetate in a detection process; the mobile phase B is methanol or acetonitrile; the detection method can accurately detect forskolin, Y-27632 and AM2394 in the cell culture biomass and the culture solution and perform quantitative analysis, and meanwhile, the detection method is simple and rapid to operate, high in sensitivity and good in repeatability.

The application provides a KrF resin, a preparation method thereof and a chemical amplification photoresist, and relates to the field of semiconductors. The KrF resin has a general structure as follows: the preparation method of the KrF resin comprises the following steps: mixing raw materials including 4-acetyloxy styrene, a first monomer compound, a second monomer compound and an initiator, and performing a first reaction; then adding an ammonium acetate-water suspension into the system, and performing a second reaction to obtain the KrF resin; the first monomer compound is a compound comprising a high ultraviolet absorption group, and the second monomer compound is a compound comprising a low-activation-energy deprotection acidic group. The chemical amplification photoresist comprises the KrF resin. The KrF resin provided by the application has the characteristics of controllable UV absorption and low deprotection activation energy. The chemical amplification photoresist has the ability to obtain good developing pattern results under different transmittance requirements.

The invention provides an ammonium acetate modified Li-LSX molecular sieve as well as a preparation method and application thereof. The preparation method of the ammonium acetate modified Li-LSX molecular sieve comprises the following steps: activating an LSX molecular sieve, immersing the activated LSX molecular sieve into an ammonium acetate solution, heating in a water bath, and calcining to obtain a crude product; and mixing the crude product with a lithium source solution, and carrying out lithium ion exchange at high temperature. The activated LSX molecular sieve is modified by using the ammonium acetate solution, so that the exchange rate of lithium ions to sodium ions can be remarkably improved, the accuracy of an SIII site of Li in a molecular sieve framework is ensured, and the nitrogen adsorption efficiency is improved; meanwhile, the method is simple in process and convenient to operate, and the production cost of the LSX molecular sieve with the high lithium ion exchange rate is remarkably reduced.

The application relates to the field of liquid chromatography analysis, and provides a method for high-performance liquid chromatography analysis of DNA dyes, which comprises the following steps: performing high-performance liquid chromatography analysis on a DNA dye-containing sample to be measured; wherein the DNA dye comprises at least one of PicoGreen and SYBR Green I; the high-performance liquid chromatography analysis adopts gradient elution, and mobile phase A, mobile phase B and mobile phase C are mixed in different proportions as mobile phases; the mobile phase A comprises at least one of acetonitrile and methanol; the mobile phase B comprises at least one of phosphoric acid aqueous solution, formic acid aqueous solution and trifluoroacetic acid aqueous solution; and the mobile phase C comprises ammonium acetate aqueous solution. The method can be used for detecting the purity of Picogreen, SYBR Green I and the DNA dyes, and realizes effective separation of target peaks and impurity peaks.

The invention belongs to the technical field of PbS quantum dots, and discloses a PbS quantum dot film, a preparation method thereof and a photoelectric device comprising the PbS quantum dot film, the preparation method comprises the following steps: 1) dissolving oleic acid coated PbS quantum dot solid in a non-polar solvent to form a first solution; 2) dissolving haloid, ammonium acetate and short-chain mercaptan in a polar solvent to form a second solution; (3) mixing the first solution and the second solution to form a mixed solution, standing, layering, removing supernatant, performing centrifugal treatment on subnatant, and drying precipitate subjected to centrifugal treatment to obtain PbS quantum dot solid powder; and 4) dissolving the PbS quantum dot solid powder obtained in the step 3) in a dispersant to obtain a dispersion liquid, coating the dispersion liquid on a substrate, and carrying out annealing treatment on the dispersion liquid to form the PbS quantum dot film. Through the synergistic effect of halogen and short-chain mercaptan, an ionic and covalent dual passivation mechanism is realized, and comprehensive defect passivation of PbS is realized.