16 results about "Ammonium citrate" patented technology

This invention provides a precise method for detecting phosphorus content in high-matrix copper-phosphorus alloys, belonging to the field of chemical analysis technology for metallic materials. The detection method of this invention includes the following steps: S1: Sample pretreatment; S2: Sample dissolution and volume adjustment; S3: Solution pretreatment: Nitric acid, hydrochloric acid, and deionized water are added to the solution and boiled to remove volatile impurities; S4: Precipitation formation: Ammonia water is added to the solution to adjust the pH to 8.5-9.5, and ammonium citrate-EDTA masking agent is added; quinomolybdate-limonene precipitant is slowly added under simmering conditions, and boiling is carried out for 10-15 minutes with intermittent stirring to ensure complete phosphorus precipitation; S5: Filtration, washing, drying, and weighing; S6: Calculation of phosphorus content. Compared with existing technologies, this invention, through a unique combination scheme, suppresses the hydrolysis of copper ions and the interference of coexisting elements, enabling precise detection of phosphorus content in high-matrix copper-phosphorus alloys. It has advantages such as strong resistance to matrix interference, high detection accuracy, good reproducibility, wide applicability, low detection cost, and simple operation.

This invention discloses a culture medium for manganese-oxidizing bacteria suitable for low-carbon source environments in water supply networks and its application. The culture medium is prepared by mixing ferric ammonium citrate, manganese sulfate, ammonium sulfate, sodium chloride, magnesium sulfate, dipotassium hydrogen phosphate, and sodium nitrate, followed by high-temperature and high-pressure sterilization to obtain a culture solution. Manganese sulfate is added to the culture solution to obtain the manganese-oxidizing bacteria culture medium. Manganese-oxidizing bacteria are screened using this culture medium. Cast iron pipe scale is subcultured in the medium to enrich the manganese-oxidizing bacteria culture solution. The enriched manganese-oxidizing bacteria culture solution is diluted and spread onto agar solid medium, and incubated at a constant temperature to obtain manganese-oxidizing bacteria colonies. This invention solves the problem of altered bacterial physiological metabolism caused by high concentrations of added manganese ions, effectively improving bacterial activity and manganese oxidation capacity.

This invention belongs to the field of cemented carbide additive manufacturing technology and discloses a method for preparing a high-solids WC-Co water-based slurry for direct-write forming. The invention uses cobalt-coated tungsten carbide powder as the solid phase, which is dispersed in an aqueous solution of ammonium citrate and polyethylene glycol composite additives to obtain a WC-Co water-based slurry with a solid content of 90wt%~93wt%. The slurry of this invention exhibits good shear-thinning properties and extrusion shape retention, with a total dispersant dosage of only 1~1.2wt%. After direct-write 3D printing and debinding sintering, a density ≥99% and a Vickers hardness >1900HV can be obtained. 30 The complex structure of WC-Co cemented carbide components is suitable for the low-cost preparation of high-performance cemented carbide in industrial applications.

The application discloses a combined depressor for recovering scheelite from ultra-low-grade tungsten-molybdenum associated ore and a method, the combined depressor comprising sodium humate, sodium mercaptoacetate, ammonium citrate, sodium pyrophosphate, sodium fluosilicate and lead nitrate, and the six kinds of substances are configured into the combined depressor in a proportion of 1:1:(2-5):(1-5):(1-3):(2-5). The application aims at recovering scheelite from low-grade refractory ore, improves the separation effect of scheelite and gangue minerals, improves the scheelite recovery rate and the concentrate grade, and improves the economic benefit.

This invention discloses an alkaline, phosphorus-free nano-chelating agent, which, by weight percentage, is composed of the following components: 30%–40% sodium hydroxide, 6%–15% polyethylene terephthalate, 5%–10% polyglutamic acid, 1%–5% polysuccinimide, 11%–18% ammonium citrate, 2%–9% nano-silica, 2%–9% nano-alumina, and the balance being water. This phosphorus-free nano-chelating agent contains no phosphorus and will not cause phosphorus pollution during use. Compared to traditional phosphorus-containing chemicals, it is more environmentally friendly and helps reduce phosphorus content in water bodies, thereby mitigating environmental problems such as eutrophication.

The application discloses a method for preparing active calcium oxide by using carbide slag, which comprises the following steps: screening the particle size of the carbide slag raw material by using an airflow classifier, adding an ammonium citrate solution into a stirring tank to obtain a sulfur-removed carbide slag mixture, performing solid-liquid separation on the sulfur-removed carbide slag mixture, and then feeding the solid-liquid separated carbide slag mixture into a continuous sintering furnace for staged sintering, wherein the continuous sintering furnace is sequentially provided with a first temperature zone and a second temperature zone along the material conveying direction, the sintered material is cooled to room temperature, and the activity of the material is detected by using a pH-temperature combined detection device; by accurately grading the core particle size section of the carbide slag, the application significantly improves the recovery rate of the target particles, reduces the production loss, deeply removes the impurities of the carbide slag, improves the product purity, guarantees the product activity and strength, and improves the product qualified rate through standardized and accurate detection, and the production link has environmental protection and safety.

A method of preparing a FeMnCeOx biomaterial is provided, including the following steps. A Pseudomonas sp. strain KW-2 is obtained. A culture medium with a pH of 6.5-7.8 is prepared, which includes 0.1 g / L K2HPO4, 0.2 g / L MnSO4·7H2O, 0.2 g / L NaNO3, 0.1 g / L CaCl2), 0.1 g / L NH4Cl, 0.1 g / L (NH4)2CO3, 35 g / L NaCl and 150 mg / L ferric ammonium citrate. The culture medium is autoclaved, inoculated with the KW-2 strain, cultured for 1-3 days, added with a cerium nitrate solution, cultured for 3-7 days and centrifuged at 4,000-8,000 rpm for 10-20 min to collect a precipitate. The precipitate is rinsed 5-8 times with deionized water and 0.01 mol / L phosphate buffered saline (PBS) and freeze-dried at −60° C. to obtain the FeMnCeOx biomaterial. A method for treating antibiotic wastewater using the FeMnCeOx biomaterial is also provided.

The present application relates to a kind of carbon quantum dots, preparation method, application, the component identification method and concentration detection method of to be measured liquid, comprising: urea and ammonium citrate are dissolved in solvent, then transfer to reaction kettle and carry out heating reaction.The carbon quantum dots provided by the present application not only have lower preparation cost itself, but also the detection method of chlorogenic acid and tinidazole is relatively simple, conducive to the low-cost detection of chlorogenic acid and tinidazole.

This invention discloses a functionalized MXene-based waterborne fire-retardant coating, its preparation method, and its application, belonging to the field of fire-retardant coating technology. This invention combines the advantages of functionalized MXene materials, such as high dispersibility, high temperature resistance, and excellent flame-retardant properties, using waterborne polyurethane as the resin matrix, ammonium citrate as the acid source, and MXene materials as nanostructured flame retardants to develop an environmentally friendly, high-performance reinforced waterborne fire-retardant coating. The MXene materials can be obtained through chemical modification with different functional groups (such as silane coupling agents, calixarenes, and MOFs) to introduce polar groups onto the surface. The fire-retardant coating prepared using functionalized MXene materials achieves UL-94 V-0 flame retardancy through a dual mechanism of physical barrier and "catalytic char formation," while also possessing high mechanical strength and thermal stability, making it suitable for protecting substrates such as metals and wood.

This invention provides a method for preparing a scale-inhibiting and bactericidal water treatment material, belonging to the technical field of water treatment materials. The method includes the following steps: adding PSI and water and stirring to disperse; adding L-histidine and NaOH; heating and reacting to obtain a histidine-modified polyaspartic acid solution; adjusting the pH to neutral; adding ferric ammonium citrate and ascorbic acid; stirring and reacting to obtain an iron-containing complex mixed solution; dissolving β-cyclodextrin in water; adding succinic anhydride and reacting; then adding an ε-polylysine aqueous solution; using EDC and NHS as condensing agents; stirring and reacting; dialysis and filtration to obtain a polylysine-cyclodextrin complex solution; adding the polylysine-cyclodextrin complex solution dropwise to the iron-containing complex mixed solution; ultrasonically stirring; adding sodium citrate and molten PEG-6000; heating and mixing; extruding; and drying to obtain the finished product. The scale-inhibiting and bactericidal water treatment material obtained by this invention can achieve efficient scale inhibition while also possessing bactericidal function, and its components are safe and environmentally friendly.

The application discloses an organic alkali cleaning solution and a multistage coupling cleaning method for SiC shower heads, and belongs to the technical field of semiconductor component wet cleaning. The organic alkali cleaning solution comprises an organic quaternary ammonium compound, an organic alcohol amine, a chelating agent, an ammonium salt corrosion inhibitor and a fluorocarbon surfactant; wherein the chelating agent is a mixture of trans-cyclohexanediaminetetraacetic acid and diethylenetriaminepentaacetic acid. The multistage coupling cleaning method for SiC shower heads comprises the steps of sequentially performing isopropyl alcohol immersion ultrasonic cleaning, organic alkali cleaning solution immersion ultrasonic cleaning and pure water ultrasonic cleaning, and then combining micro-nano bubble cleaning. The selected organic alkali cleaning solution comprises a three-component synergistic system of trans-cyclohexanediaminetetraacetic acid, diethylenetriaminepentaacetic acid and ammonium citrate. The use of the chelating agent produces a significant synergistic chelation effect on various metal ions, and the ammonium citrate simultaneously plays multiple functions of corrosion inhibition, auxiliary chelation and particle dispersion, which helps to significantly improve the cleaning effect.

This invention belongs to the field of metal surface treatment technology, and relates to a cyanide-free cadmium plating and cadmium-titanium plating removal solution, method, and application. The removal solution consists of the following components: main oxidant: nitric acid with a volume percentage concentration of 5% to 15%; pH buffer and complexing component: composed of ammonium acetate and ammonium citrate, with a total addition amount of 5 to 15 grams per 100 ml of the removal solution, wherein the mass percentage of ammonium citrate is not less than 30%; conductive salt: ammonium chloride, with an addition amount of 10 to 25 grams per 100 ml of the removal solution; additive: double-functional... The invention comprises a bifunctional nanocapsule additive, added at a rate of 1 to 4 grams per 100 ml of stripping solution, with the remainder being deionized water. The bifunctional nanocapsule additive has a core-shell structure, with a core of layered hexagonal boron nitride nanosheets and a shell of pH-responsive silane-cerium composite gel. The stripping solution of this invention is completely free of ammonium nitrate, thus avoiding regulatory risks. It achieves efficient stripping, simultaneous inhibition of hydrogen embrittlement, and in-situ self-passivation through a one-step operation, integrating traditional multi-step processes into a single step, significantly simplifying the process and resulting in excellent stripping quality.

The present application relates to the technical field of cell engineering, and particularly relates to a culture medium for producing biological antibodies and a fermentation method thereof.The culture medium comprises a basic culture medium and a fermentation culture medium; the basic culture medium is based on a commercial culture medium and comprises the following components: fumaric acid, ferric ammonium citrate, astragaloside and baicalein; the fermentation culture medium is based on a commercial culture medium and comprises the following components: L-citrulline, L-ornithine, L-theanine, L-homoarginine, L-hydroxyproline, L-allo-threonine, mannose, isorhamnetin and ginkgolin.The culture medium combination can effectively improve the expression level of target antibodies, supports cells to maintain long-term activity in a high-density state; meanwhile, the charge variant distribution of the obtained antibodies is more uniform, and the product purity and consistency are significantly improved.

This invention belongs to the field of polymer composite material preparation technology, and particularly relates to a crack-resistant and flame-retardant material for cables and its preparation process, including the following steps: dissolving PVP and ammonium citrate in an ethanol solution, adding Mg / Al-LDH and hydrophilic modified expanded graphite for dispersion, heating and adding aluminum isopropoxide solution for reaction, washing and dispersing in phytic acid solution, heating and reaction, washing and drying to obtain flame-retardant microparticles; mixing EVA, EVA-g-MAH, flame-retardant microparticles, antioxidants and lubricants and extruding them in an extruder, cooling and pelletizing the extrudate to obtain the crack-resistant and flame-retardant material for cables. This invention obtains the material by blending flame-retardant microparticles with EVA and other materials and then granulating them. The flame-retardant microparticles can meet the flame-retardant requirements of the sheath made of the material with a relatively small amount added, improving the continuity of the EVA matrix and preventing cracking of the sheath under frequent bending conditions.

This invention discloses a low-temperature preparation technology for plasma-assisted hydrothermal synthesis of carbon nanotubes and its application in the field of cold cathode technology. It relates to the fields of carbon nanotube preparation and cold cathode technology, including the construction of a reaction system containing a catalyst precursor and a carbon source, and a hydrothermal reaction: the catalyst precursor is a phosphorus-free core-shell Ni-Mo-ammonium citrate complex, formed by nickel nitrate, sodium molybdate, and ammonium citrate in the order Ni... 2+ :MoO4 2‑ The reaction is carried out with a citrate molar ratio of 3:1:1.2. In this invention, phosphorus residue and catalyst agglomeration are eliminated by using a phosphorus-free core-shell catalyst, combined with a composite heteroatom source and ultrasonic-stirring dispersion process, and a three-stage pulsed plasma reaction at ≤190℃. This optimizes the quality of carbon nanotubes, eliminates the need for acid washing / annealing, and is compatible with flexible substrates. The cold cathode is fixed by a modified PET substrate and a metal-free transition layer, ultimately achieving a 1×10⁻⁶ reaction. ‑4 Achieving an on-state electric field ≤1.8V / μm, a threshold electric field ≤4.2V / μm, and a current density stability ≥90% under Pa conditions, this technology solves the problems of carbon nanotube quality, cost, substrate compatibility, and cold cathode performance in traditional technologies.

This invention provides a method for preparing and applying a graphene-supported ruthenium quantum dot catalyst. By designing and developing a Ru@N-rGO catalyst, the hydrogenation of phenol, a model compound of bio-oil, was studied to prepare high-value-added cyclohexanol. Specifically, using graphene oxide as a substrate, leveraging its rich surface chemistry, adding ammonium citrate as a binder and nitrogen source, and incorporating a Ru precursor, a Ru@N-rGO composite catalyst was successfully prepared via a wet chemical-carbothermic reduction method. The Ru@N-rGO composite catalyst promotes excellent conversion and stability in the hydrogenation of phenol to cyclohexanol.