178 results about "Sodium thiosulfate" patented technology

The invention discloses a high-temperature-resistant and salt-resistant fracturing fluid and a preparation method thereof, and relates to the technical field of oil field fracturing fluids. When the high-temperature-resistant and salt-resistant fracturing fluid is prepared, sodium 3-chloro-2-hydroxypropane sulfonate, N, N-dimethylacrylamide and ethylene glycol react to prepare a quaternized solid product, and then the quaternized solid product reacts with 1-bromooctadecane to prepare an amphoteric hydrophobic monomer; guar gum powder reacts with 3-(1-naphthyloxy)-1, 2-epoxypropane to prepare naphthyloxy functionalized guar gum, and then the naphthyloxy functionalized guar gum, acrylamide and an amphoteric hydrophobic monomer are subjected to initiated polymerization through ceric ammonium nitrate to prepare modified guar gum; enabling zirconium oxychloride octahydrate, titanium chloride, lactic acid, ethanediamine and glycerol to react to prepare an organic zirconium cross-linking agent; and finally, mixing the modified guar gum, an organic zirconium cross-linking agent, sodium thiosulfate, sodium bromate, a surfactant and water to prepare the high-temperature-resistant and salt-resistant fracturing fluid. The high-temperature-resistant and salt-resistant fracturing fluid prepared by the invention has excellent high-temperature resistance and salt resistance.

This invention provides a PAM staining method that enables staining suitable for magnified observation of various samples using a range of microscopes, from optical microscopes to electron microscopes. [Solution] A PAM staining method comprising the steps of: silvering a biological sample; coloring the biological sample; and fixing the color of the biological sample, wherein the biological sample is a biologically derived sample that has been oxidized; the silvering step involves immersing the biological sample in a methenamine silver aqueous solution at room temperature, raising the methenamine silver aqueous solution from room temperature to 62°C or higher and 68°C or lower, and carrying out the silvering reaction for 30 to 40 minutes from the start of the reaction at room temperature; the coloring step involves immersing the silvered biological sample in a 0.2% gold chloride aqueous solution at room temperature for 8 to 12 hours; and the fixing step involves immersing the sample in a hard film fixing solution containing 11% to 13% sodium thiosulfate and aluminum potassium sulfate dodecahydrate for 3 minutes or more at room temperature.

The invention relates to a water treatment agent for advanced treatment of thallium-containing wastewater in nonferrous metallurgy. The water treatment agent is prepared by fully mixing and uniformly stirring the following raw materials in parts by weight: 50-80 parts of a sodium diethyldithiocarbamate aqueous solution with the mass concentration of 5%-15%, 10-40 parts of sulfide or polysulfide and 10-40 parts of sodium thiosulfate. The water treatment agent provided by the invention can realize efficient removal of heavy metal ions, does not need a subsequent treatment process, not only simplifies the treatment process, but also reduces the treatment cost.

The invention discloses a preparation method of tiamulin and tiamulin fumarate based on Bunte salt, which comprises the following steps: mixing the Bunte salt and pleuromutilin p-toluenesulfonate, reacting at 45-65 DEG C for 3-5 hours to synthesize tiamulin, preparing the Bunte salt through a reaction formula 1, and preparing the pleuromutilin p-toluenesulfonate through a reaction formula 2, the molar ratio of the 2-diethylaminoethanol to the sodium thiosulfate to the chlorination reagent in the reaction formula 1 is 1: (1-1.3): (1-1.5), and the molar ratio of the pleuromutilin to the paratoluensulfonyl chloride to the pyridine in the reaction formula 2 is 1: (1-1.2): (1-1.2); the prepared tiamulin and fumaric acid are used as raw materials for a salt forming reaction, the reaction temperature ranges from 55 DEG C to 65 DEG C, the reaction time ranges from 40 min to 80 min, and after the reaction is finished, the tiamulin fumarate is prepared through cooling, crystallization, centrifugation and drying; the tiamulin fumarate disclosed by the invention is high in content, low in total amount of impurities, few in variety and stable in quality under high-temperature and high-humidity conditions, and the preparation method is simple and easy to operate and good in product quality.

The invention relates to a nano bismuth agent for preventing and / or treating gastritis infection as well as a preparation method and application thereof, the preparation method comprises the following steps: respectively dissolving soluble bismuth salt and a sulfur-containing compound, mixing, and reacting to obtain the nano bismuth agent after the reaction is finished, the sulfur-containing compound is any one or a combination of at least two of thioamino acid, vitamin B1, thioacetamide, sodium sulfide, sodium thiosulfate, bovine serum albumin, whey protein, ovalbumin or metallothionein. The prepared nano bismuth agent has efficient antibacterial performance, shows an excellent curative effect which is two orders of magnitude higher than that of an existing bismuth complex on clinically separated drug-resistant helicobacter pylori, and does not further induce increase of drug resistance of the helicobacter pylori.

The present application provides a kind of prevention and control method of green moss in water lily planting pool, specifically belongs to water quality control technical field.The prevention and control method of green moss in water lily planting pool described in the present application includes the following steps: before planting water lily, water injection, water level is controlled at 15~20cm, copper sulfate is applied to kill green moss and its spores, keep water body not to flow during disinfection;After disinfection, apply sodium thiosulfate, and plant water lily;After planting water lily, keep replenishing water, control water level to 40~50cm, when green moss first outbreak, apply mineral fulvic acid potassium and composite bacillus;Subsequent green moss outbreak, apply mineral fulvic acid potassium, or apply mineral fulvic acid potassium and composite bacillus.The prevention and control method described in the present application is safe and efficient, which can quickly and effectively remove green moss without inhibiting the growth of water lily, and also does not affect the harvest of water lily.

This invention discloses a method for preparing a carbon source for microbial culture medium based on enzymatic hydrolysis of bamboo powder and its application, belonging to the field of high-value utilization technology of biomass resources. Using bamboo powder as raw material, the invention involves mild alkali pretreatment to disrupt the dense structure of lignocellulose, followed by enzymatic hydrolysis using a specialized enzyme system of endoglucanase Cel7B and xylanase XynA expressed heterologously by *E. coli* in an optimized ratio. After solid-liquid separation, an enzymatic hydrolysate rich in reducing sugars is obtained. The hydrolysate is then nutritionally fortified with trace elements such as sodium thiosulfate and sodium silicate to produce a low-cost, high-efficiency liquid carbon source. This invention achieves high-value utilization of bamboo waste. The entire process is mild, environmentally friendly, and simple, easily scaled up industrially, and solves the industry bottleneck of high carbon source cost in industrial microbial culture, demonstrating good application prospects and market value.

The invention discloses a gas-phase white carbon black tail gas dechlorination process, which belongs to the technical field of tail gas treatment, and comprises tail gas pretreatment and particulate matter separation, germanium molecular sieve carrier preparation and modification, Fe-Cu bimetallic nano-cluster loading, dynamic pulsed electric field activation, dry-process dechlorination, wet-process reduction synergistic dechlorination and photo-thermal coupling regeneration. According to the method, the alkyl halide dehalogenase is introduced as a stabilizer, and the Fe3O4-CuO nano-cluster activated by the dynamic pulsed electric field is adopted, so that the reaction process is remarkably optimized, the alkyl halide dehalogenase and active components in the sodium thiosulfate solution form synergistic action sites, the selectivity and efficiency of sodium thiosulfate participating in the reaction are improved, and the reaction time is shortened. The consumption in a non-target reaction is avoided; according to the Fe3O4-CuO nano-cluster activated by the dynamic pulsed electric field, the chlorine removal efficiency is improved, and the usage amount of sodium thiosulfate is reduced, so that the consumption amount of sodium thiosulfate and the generation amount of waste liquid are synchronously reduced, and the high-cost investment of enterprises on waste liquid treatment and the risk of environmental protection compliance are reduced.

The invention relates to a synthesis method of low-cost environment-friendly dioscorea element I. The synthesis method comprises the following steps: by taking 3, 5-dimethoxybenzyl alcohol as a raw material, brominating, reacting with triethyl phosphite and 4-benzyloxy-3-methoxybenzaldehyde to generate 3, 4 ', 5-trimethoxy-3'-benzyloxy stilbene, carrying out ultraviolet cyclization reaction, reacting with palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon and debenzylating with hydrogen to obtain the Chinese yam element I. The potassium iodide is used as the catalyst in the ultraviolet lamp irradiation catalytic ring closing reaction, the pure water is used as the detergent, compared with the method adopting iodine as the catalyst and adopting a sodium thiosulfate aqueous solution as the detergent, the product yield of the compound 33-4 is 75%, the yield of the compound 33-5 is 16.6%, the purity is 98.7%, and the method has the advantages of low cost, high yield, few impurities and the like.

The invention discloses a chromium-containing wastewater treatment and recovery treatment line and a recovery treatment method thereof. The ion exchange system is used for carrying out ion exchange adsorption on the hexavalent wastewater; the alkali washing system is used for outputting alkali liquor to the ion exchange system; the washing system is used for outputting washing water to the ion exchange system; the pickling system is used for outputting acid liquor to the ion exchange system; the chromium recovery treatment branch line is used for receiving the hexavalent wastewater of the ion exchange system, mixing the hexavalent wastewater with sulfur powder and alkali liquor to prepare chromium hydroxide, then carrying out filter pressing on the chromium hydroxide, outputting a chromium hydroxide filter cake to the recovery calcination treatment line, and outputting a press filtrate to the press filtrate recovery branch line; the press filtrate recovery branch line is used for recovering sodium thiosulfate from the press filtrate; and the recycling and calcining treatment line is used for calcining the chromium hydroxide filter cake into Cr2O3. According to the scheme, the purposes of micro discharge and even zero discharge of the chromium-containing wastewater are achieved, and the problem that a large amount of chromium-containing hazardous waste sludge is generated by depending on a chemical reduction-precipitation method in traditional chromium-containing wastewater treatment is solved.

The utility model provides a carbon black iodine absorption value measuring device which comprises a rotating wheel disc, a magnetic stirrer, a transmission filtering device and a reaction tank, a plurality of sample cups can be placed on the rotating wheel disc, after a mixed liquid sample is stirred by the magnetic stirrer, an iodine solution and a sodium thiosulfate solution are extracted by a plunger pump, and the iodine absorption value of the carbon black is measured. In the extraction process, carbon black in the iodine solution is filtered through the filter pipe, filtrate is added into the reaction tank and chemically reacts with the sodium thiosulfate, and the iodine ion electrode in the reaction tank can judge the end point of the reaction by detecting the electron exchange capacity of the iodine solution and the sodium thiosulfate in the reaction tank when the iodine solution and the sodium thiosulfate are subjected to oxidation-reduction reaction. And meanwhile, the measured current data is transmitted to a microcomputer for automatic processing, so that accurate carbon black iodine absorption value data is obtained. The problems that manual operation is low in efficiency and the precision is greatly influenced by human factors are solved, and the advantages of high efficiency and high precision are achieved.

The present application belongs to the field of metallurgy, and relates to a method for producing antimony white by directly oxidizing crude antimony, comprising the following steps: S1, mixing crude antimony with crude antimony alloy, and reacting under an oxygen-containing atmosphere, to obtain oxidized slag and a melt after the reaction is completed; S2, adjusting the temperature of the melt, and then introducing compressed air to react, to produce antimony trioxide-containing flue gas, and to obtain antimony oxide slag after the reaction is completed. The present application makes full use of impurities such as sodium sulfide, sodium hydroxide and sodium thiosulfate contained in crude antimony, and innovatively uses these components for arsenic removal reaction, which not only avoids the cumbersome steps of adding various auxiliary materials in the traditional process, but also enables the original sodium sulfide, sodium hydroxide and sodium thiosulfate in the crude antimony to fully play a synergistic role, showing excellent performance in arsenic removal effect, thus simplifying the process flow, significantly reducing the production cost, and realizing the dual improvement of economic benefit and process efficiency.

The invention discloses a preparation method of N-methyl o-fluoroaniline, which is characterized in that o-fluoroaniline is used as a starting raw material, and a target product is efficiently synthesized through three steps of reaction: step 1, in the presence of a solvent and alkali, o-fluoroaniline and acetyl chloride are acetylated at low temperature to generate 2-fluoro-acetanilide, and the product is directly used for the next step after being roughly purified; 2, under the action of a solvent and alkali, carrying out controllable methylation on the 2-fluorine-acetanilide and dimethyl carbonate to obtain 2-fluorine-N-methylacetanilide; and 3, removing acetyl protection through acidic hydrolysis, and adding sodium thiosulfate to prevent oxidation to finally obtain a high-purity product. According to the method, excessive methylation is avoided through an acetyl protection strategy, the process does not need high-risk operations such as ultralow temperature and high pressure, the operation is simple and convenient, the energy consumption is low, and the product purity is gt; the total yield reaches 79.86%, and the method is green, safe and suitable for industrial production.

The invention relates to a chemical absorption liquid for removing methyl iodide and a preparation method thereof, and belongs to the technical field of underwriting. The chemical absorption liquid comprises the following raw materials in percentage by mass: 0.2-5% of sodium thiosulfate, 1-10% of long-chain alkyl trimethyl ammonium halide, 0-1% of sodium hydroxide, 0-10% of polyethylene polyamine and the balance of water. The number of long-chain carbon atoms in the long-chain alkyl trimethyl ammonium halide is greater than 8; the chemical absorption liquid is prepared by completely dissolving and uniformly mixing the components. According to the chemical absorption liquid, the long-chain alkyl trimethyl ammonium halide salt is introduced as a surfactant for the first time, has a solubilizing effect, and can greatly reduce the gas-liquid mass transfer resistance of methyl iodide, so that efficient absorption of radioactive and non-radioactive methyl iodide is realized; the chemical absorption liquid is not only suitable for normal temperature, but also suitable for high-temperature and high-humidity environments, and harmful gas can be purified in a solution washing or solution spraying mode.

To provide a unit dosage form containing a pharmaceutically acceptable sodium thiosulfate (for example, sodium thiosulfate pentahydrate).SOLUTION: There is provided a unit dosage form which contains 10 ppm or less of non-removable organic carbon, 0.05 ppm or less of mercury, 2 ppm or less of aluminum, 0.003 wt.% or less of selenium, and on an anhydrous basis measured by ion chromatography, 98 wt.% or more and 102 wt.% or less of sodium thiosulfate, 10 ppm or less of heavy metals, 200 ppm or less of chlorides, 0.001 wt.% or less of sulfides, 0.002 wt.% or less of iron, 0.01 wt.% or less of calcium, 0.005 wt.% or less of potassium, 0.1% or less of sulfites, 0.5% or less of sulfates and 3 ppm or less of arsenic, 0.001 wt.% or less of lead or the like, wherein a 10% aqueous solution at 25°C is colorless and has a pH of 6.0 to 8.0.SELECTED DRAWING: None

This application belongs to the field of water quality testing technology, specifically relating to a method for testing ammonia nitrogen in wastewater from the hydrometallurgical process of laterite nickel ore. The method includes the following steps: adding sodium thiosulfate and zinc sulfate to the wastewater, adjusting the pH with a boric acid-sodium hydroxide buffer solution to pH 9.5, and allowing the solution to stand; filtering, taking an appropriate amount of filtrate into a colorimetric tube, and adjusting the volume, then adding potassium sodium tartrate and Nessler's reagent, mixing well, and allowing it to stand; measuring the absorbance, and calculating the ammonia nitrogen concentration in the wastewater based on the absorbance. This method can effectively eliminate the interference from high sulfate content and metal ions in high-sulfate industrial wastewater. The resulting colorimetric system is highly stable and has the advantages of being simple to operate and providing reliable results. It holds significant importance for the testing and treatment of wastewater from the hydrometallurgical process of laterite nickel ore.

The invention discloses a method for removing antibiotics by activating permanganate through ball milling MoS2, and belongs to the field of water treatment technologies and environmental functional materials. The method comprises the following steps: co-precipitating to synthesize MgAl-layered double hydroxides, and carrying out hydrothermal compounding and ball-milling bonding to obtain the ball-milling modified composite material and the water treatment application thereof. In order to solve the technical problems that in an existing permanganate activation technology, active species in a homogeneous system are prone to inactivation, the activation efficiency of a heterogeneous system is low, and only physical contact exists between materials, so that an interface electron transfer potential barrier is high, sodium thiosulfate is adopted for assisting ball milling to induce chemical bonding, a continuous electron transfer network is constructed, an electron-rich state is formed on the surface of MoS2, and the MoS2 is prepared. Antibiotics are synergistically oxidized through a high-valence manganese intermediate and a free radical double path, and meanwhile heavy metal is adsorbed through multiple mechanisms of sulfur coordination, sulfur vacancy anchoring and hydroxyl complexing. Under the optimal condition, the method realizes that the SMX removal rate reaches 96.8% and the lead ion removal rate reaches 99.2%.

The present application relates to a kind of preparation methods of ultra-low profile thick electrolytic copper foil, comprising: i. adding composite additive in foil electrolyte, the composite additive is composed of phenylethyl resorcinol, sodium thiosulfate and diallyl disulfide;II. Adding bismuth sulfate as inorganic additive in roughening solution of surface treatment process.The ultra-low profile thick electrolytic copper foil prepared by the present application has lower surface roughness, and the actual effective copper thickness is close to the theoretical value. Under the same 2-3Oz thickness specification, the effective thickness of the copper foil is thicker than the conventional RTF copper foil. In the PCB circuit, it shows low resistance, less power consumption and better heat dissipation performance, solving the technical problems of high power loss and poor heat dissipation performance under AI high computing power.

The application belongs to the technical field of microorganisms, and particularly relates to a Moraxella rosselloensis with deep-sea mining heavy metal pollution ecological restoration function and application thereof. Rossellomorea yichunensis The Latin name of the Moraxella rosselloensis is Moraxella rosselloensis, which was preserved in the China General Microbiological Culture Collection Center on July 30, 2025, and the preservation number is CGMCC NO: 35470. The strain can produce hydrogen sulfide by using sodium thiosulfate; and has tolerance to heavy metals such as Mn 2+ , Co 2+ , Cu 2+ and Cd 2+ ; in the degradation experiment of the strain, the removal rate of Cd 2+ reaches 90.03%; the removal rate of Cu 2+ reaches 77.28%; and the removal rate of Mn 2+ reaches 68.36%. It can be known that the strain has strong application value for ecological restoration of heavy metal ions such as Mn, Cu and Cd released in deep-sea mining.

The application provides an immersion solution for a corneal contact lens, a preparation method and the corneal contact lens, and the immersion solution is prepared from the following raw materials in mass percentage: letastigmine 0.01-0.15%; buffer salt 0.1-2%; sodium chloride 0.2-1.2%; sodium thiosulfate 0-0.5%; and pure water 97-99%. The immersion solution for the corneal contact lens prepared by the application can well interact with water molecules in the corneal contact lens, so that the drug molecules in the immersion solution are well replaced in the corneal contact lens, the drug molecules are retained in the gel network of the corneal contact lens, high drug loading is achieved, the bioavailability of the drug is improved, the corneal contact lens prepared by the immersion solution has a drug slow-release effect, directly acts on the eyes and can reduce the toxic and side effects of the drug.

The invention relates to the technical field of medicines, in particular to a preparation process of xantinol nicotinate injection and an impurity control method of the xantinol nicotinate injection. According to the process, water for injection is subjected to nitrogen deoxidation treatment, a whole-process nitrogen-sealed environment is maintained, xantinol nicotinate is gradually added in three times, and a multi-component synergistic stable system including hydroxypropyl-beta-cyclodextrin, N-acetyl-L-cysteine, L-methionine, diethylenetriamine pentaacetic acid, sodium metasulfite, sodium thiosulfate and the like is matched, so that the xantinol nicotinate injection is prepared. Double-molecular-weight dextran is introduced to regulate and control a microenvironment, an acetic acid-sodium acetate buffer system is introduced to optimize pH, and finally, high stability and low impurity generation of the finished injection at high temperature are realized through nitrogen replacement subpackaging and precise sterilization conditions. According to the method, the content and the purity of the xantinol nicotinate injection are remarkably improved, the impurity content during sterilization and storage is remarkably reduced, the safety and the effectiveness of drugs are guaranteed, and the method has important significance on optimization of a heat-sensitive injection process.

The invention discloses a CoS2 (at) TCPP-Co nano composite material as well as a preparation method and application thereof, and relates to the technical field of rapid detection of nano enzyme materials and efficient degradation of fungaltoxin. The preparation method of the CoS2 (at) TCPP-Co nano composite material comprises the following steps: dissolving cobalt nitrate and sodium thiosulfate in water, adding ethylene glycol and ethanol, stirring and heating to react, centrifuging, washing and drying a solid to obtain CoS2. The preparation method comprises the following steps: dissolving tetra (4-carboxyl phenyl) porphin and polyvinylpyrrolidone in N, N-dimethylformamide and absolute ethyl alcohol, uniformly mixing, adding CoS2, carrying out a constant-temperature reaction, and finally centrifuging, washing and drying to obtain the CoS2 atTCPP-Co nano composite material. The composite material shows excellent peroxidase-like activity, and can be coupled to a ligand to realize rapid quantitative detection of AFB1. In addition, reactive oxygen free radicals generated by the CoS2 (at) TCPP-Co in the catalytic reaction can efficiently destroy the molecular structure of AFB1, so that effective degradation of the toxin is realized.

The application discloses a treatment method for efficiently removing selenium from waste acid, and specifically comprises the following steps: preheating waste acid to be treated for removing selenium, adding sulfuric acid to adjust the H + concentration of 4-6 mol / L, then adding a reducing agent sodium sulfite Na2SO3, and fully stirring and mixing; controlling the temperature to be 55-70 DEG C to perform a first-stage reaction, then adding a composite catalyst prepared by mixing sodium thiosulfate Na2S2O3 and iodine I2, stirring and mixing, continuing to perform a deep reaction, and performing solid-liquid separation after filtration when the reaction is completed. The application uses sodium sulfite reduction, iodine and sodium thiosulfate catalysis as a substitute for the traditional SO2 reduction mode, solves the problem that the traditional SO2 reduction method is limited by pH liquid, accelerates the reaction rate through iodine and sodium thiosulfate catalysis, simultaneously solves the problem that the traditional sulfite cannot reduce selenium-containing substances other than selenite, and improves the reduction effect of selenium.

The invention discloses a preparation method of sabesartan sodium in the technical field of medicines, which comprises the following steps of: adding cuprous chloride and a catalyst in the SN2 nucleophilic substitution reaction process of 8-chloro ethyl caprylate serving as a raw material and capralan, so that the reaction selectivity and the reaction yield are improved; a sodium hydroxide hydrolysis reaction is carried out, and a reducing agent is added under an anaerobic condition, so that the formation of colored impurities is minimized; and finally salifying with sodium hydroxide in an alcohol solvent to obtain a final product SNAC. The method has the advantages of high efficiency, simplicity, easiness in factory operation, good product appearance, high purity, economical and easily available raw materials and good industrialization prospect.

The invention provides a nucleic acid protective agent and a preparation method and application thereof, the nucleic acid protective agent comprises a nucleic acid stabilizing main reagent, an RNA enzyme inhibitor and an antioxidant, the nucleic acid stabilizing main reagent comprises maltodextrin, xylitol and hydroxypropyl-beta-cyclodextrin; the RNA enzyme inhibitor comprises cyclopentanol and tetrahydrofurfuryl alcohol; the antioxidant comprises sodium thiosulfate, sodium pyrophosphate and ascorbic acid. According to the nucleic acid protective agent provided by the invention, free nucleic acid substances including DNA and RNA can be preserved for 2 weeks under the condition of 37 DEG C, preserved for 6 months under the condition of 2-8 DEG C and preserved for 15 months under the condition of-20 DEG C, and the degradation rate is less than 10%.

The application provides a method for analyzing nickel in a zinc-nickel electroplating solution. The method comprises: performing standard coulometric titration on a sodium thiosulfate standard solution to calculate an actual molar concentration c 标准 ; adding an oxidizing agent solution and a sodium hydroxide solution to the zinc-nickel electroplating solution to obtain a high-nickel hydroxide precipitate, then adding a KI solution and sulfuric acid to obtain a sample solution; adding a second part of the sodium thiosulfate standard solution and a second part of a KI electrolyte to an electrolytic cup to perform sample coulometric titration and calculate the molar concentration c 镍 of nickel in the zinc-nickel electroplating solution. The application uses the change in the valence state of nickel hydroxide, combines a redox reaction with an indirect coulometric titration method, and obtains a cyanide-free coulometric titration method for quantitatively determining the content of nickel in a zinc-nickel electroplating solution. The method does not need to prepare a standard solution, indirectly determines nickel by using electrically generated iodine in a high-concentration zinc metal ion background, realizes high selectivity, high precision, and online determination of the content of nickel, and can significantly improve the detection efficiency.

The invention discloses an Ag2S / Cu9S8 / PANI / cotton fabric and a preparation method and application thereof. The preparation method comprises the following steps: preparing an organic phase solution and a water phase solution; respectively soaking the cotton fabric in the organic phase solution and the aqueous phase solution to obtain a PANI cotton fabric; mixing copper sulfate pentahydrate, sodium thiosulfate, silver nitrate and distilled water, and adjusting the pH value to obtain a reaction solution; and putting the PANI cotton fabric into the reaction solution to react, and then taking out to obtain the Ag2S / Cu9S8 / PANI / cotton fabric. An interfacial polymerization method is adopted to synthesize polyaniline on a cotton fabric to prepare a PANI cotton fabric in situ, and a stepped heating water bath oscillation reaction is adopted to prepare the Ag2S / Cu9S8 / PANI cotton fabric. According to the invention, the preparation method is simple and convenient, and the prepared Ag2S / Cu9S8 / PANI cotton fabric has excellent conductivity and electromagnetic shielding effectiveness.

The invention discloses a citric acid fentanyl injection and a preparation method thereof, and belongs to the technical field of pharmaceutical preparations. The formula of the citric acid fentanyl injection comprises an active ingredient citric acid fentanyl, a pH buffering agent, a compound stabilizer, an isoosmotic adjusting agent and solvent water for injection, the compound stabilizer is composed of sodium thiosulfate, citrulline and methyl meglumine, and the sodium thiosulfate, the citrulline and the methyl meglumine cooperate to inhibit degradation of citric acid fentanyl citrate. Through a specific compound stabilizer system and an optimized preparation process, the stability, the dissolution efficiency and the quality uniformity of the injection are remarkably improved, the process steps are clear, parameters are definite, and the injection is suitable for large-scale production and has important clinical value and industrial significance.

This application relates to the field of water pollution control technology and discloses a method for preparing a sediment microecological reconstruction and pollutant-targeted immobilization conditioner. The method includes: modifying mesoporous silica with amino- and thiolated compounds and mixing it with biochar to obtain an adsorbent material; dispersing ferrous sulfate, sodium thiosulfate, and hydroxyapatite with the adsorbent material in a sodium alginate solution and adding it dropwise to a calcium chloride solution for cross-linking and chitosan coating to obtain microcapsules; compounding riboflavin, humic acid, carbon source nutrients, and adding signaling molecules to obtain a metabolic enhancer; compounding metalloenzyme inhibitors and activating them with microorganisms to obtain an activator; granulating and coating calcium carbonate, magnesium hydroxide, ferrous sulfate, sulfur powder, calcium peroxide, and sodium lactate to obtain buffer particles; mixing the adsorbent material, microcapsules, and buffer particles, spraying, adding the metabolic enhancer and activator, adding binders and pore-forming agents, granulating, drying, sieving, and spraying a protective film to obtain the conditioner. This application solves the technical problems of existing sediment conditioners, such as single function, uncontrolled release, and microecological imbalance.

The invention relates to the technical field of surface treatment, in particular to a plating solution and process for cyanide-free gold electroplating, and the plating solution for cyanide-free gold electroplating comprises sodium gold sulfite, sodium sulfite, sodium thiosulfate, triammonium citrate, thiourea and organic amine compounds. The plating solution adopts a cyanide-free plating solution system, so that the environmental protection property is improved. Importantly, an organic amine compound serving as a welding binding agent is added into the plating solution, amino containing lone pair electrons is contained in the molecular structure of the organic amine compound and has a strong polarity adsorption effect, and the amino and active sites on the surface of a gold plating layer are subjected to a coordination reaction in the subsequent gold plating process, so that the bonding effect is improved. And monomolecular layer adsorption films which are arranged in order are formed on the surface of the plating layer by means of intermolecular Van der Waals force, so that non-uniformity of surface energy is corrected, and unstable high surface energy is converted into stable, uniform and controllable surface energy. And meanwhile, the surface is cleaned, impurities are removed, the interface reaction is regulated and controlled, the wettability of the welding flux on the surface of the plating layer is enhanced, and the welding flux can be rapidly spread in the welding process to form a continuous and uniform welding flux layer.