78 results about "Disodium EDTA" patented technology

The invention discloses a triiodothyronine dissociation agent, a detection kit, a preparation method of the triiodothyronine dissociation agent and application of the triiodothyronine dissociation agent and the detection kit, and the triiodothyronine dissociation agent comprises 10-100 mM of acetic acid-sodium acetate buffer solution, 0.05-1 g / L of ethylene diamine tetraacetic acid disodium salt, 1-10 g / L of perfluoroalkyl ethyl methacrylate, 0.2-1 mL / L of Tween-20 and 0.2-2 mL / L of ProClin 300, the pH (Potential of Hydrogen) of the triiodothyronine dissociation agent is 5.5 + / -1; the kit comprises a triiodothyronine dissociation agent and a reagent strip. According to the present invention, the two sites can be specifically recognized, the sensitivity and the specificity are high, the high-specificity detection on the specific antigen can be achieved, and the low-end sensitivity is high; meanwhile, the interference problem of rare earth europium during detection of triiodothyronine can be solved, and the accuracy of a detection result is further improved.

The application discloses a polishing liquid and a polishing method for a laser gyroscope cavity, and the polishing liquid comprises a polishing liquid and acid-resistant soft abrasive particles, the polishing liquid comprises the following components in mass fraction: HF 5-20%, H2SO4 5-10%, CH3COOH 10-20%, NH4HF 10-20%, disodium ethylenediaminetetraacetate 2-5%, ammonium sulfate 2-5%, and the balance is water; the mass of the acid-resistant soft abrasive particles is 10-20% of the mass of the polishing liquid. The polishing method comprises circulating jet polishing of the polishing liquid at a flow rate of 500-600 mL / min through the laser gyroscope cavity. The polishing liquid can realize one-time polishing of the laser gyroscope cavity during polishing, not only has good polishing effect, but also greatly improves polishing efficiency and greatly reduces polishing cost, and can also avoid the uneven corrosion caused by the traditional polishing method of fixing the cavity.

The invention relates to the technical field of production and preparation of ammonium tetramolybdate, and particularly discloses a preparation method for producing high-purity ammonium tetramolybdate from low-grade molybdenite. The preparation method for producing the high-purity ammonium tetramolybdate from the low-grade molybdenite comprises the following steps: S1, pretreating the low-grade molybdenite to obtain slag, and roasting the slag to obtain roasted slag; s2, the roasted slag and an ammonia water solution are mixed and leached, and a leaching solution is obtained; s3, an impurity removal agent and an adsorbent are added into the leachate for adsorption and purification, the impurity removal agent comprises mercaptoacetic acid and disodium ethylene diamine tetraacetate, the adsorbent is modified calcium alginate, and after purified liquid passes through an anion exchange resin column, an ammonium molybdate solution is obtained; and S4, adding a nitric acid solution into the ammonium molybdate solution, adjusting the pH value, and then crystallizing to obtain high-purity ammonium tetramolybdate. According to the preparation method, the purity of the ammonium molybdate solution is effectively improved through three procedures, and then the purity of ammonium tetramolybdate prepared from low-grade molybdenite is effectively improved.

The invention belongs to the technical field of metallurgy, and relates to a comprehensive recovery method for antimony-containing gold concentrate, which comprises the following steps: S1, mixing antimony-containing gold concentrate and an antioxidant, carrying out size mixing, then adding sodium sulfide and sodium hydroxide to obtain a size, and reacting to obtain a leaching solution and leaching residues; s2, the leachate obtained in the step S1 is subjected to electrodeposition, and crude antimony and barren liquor are obtained; wherein in the step S1, the antioxidant is a mixture of sodium ascorbate and ethylenediamine tetraacetic acid disodium salt. According to the method, the antimony-containing gold concentrate is subjected to antimony leaching through Na2S under the alkaline condition, in order to avoid gold loss caused by the fact that S < 2-> is oxidized into S < x > < 2-> and then the S < x > < 2-> and Au generate AuSx dissolved in an alkaline solution in the leaching process, an antioxidant is added in the leaching process, leaching of gold in the antimony-containing gold concentrate can be remarkably reduced, and the recovery rate of gold is increased.

The invention provides pantoprazole sodium for injection, which is prepared by dissolving 40 parts of pantoprazole sodium, 25 parts of amino-PEG-mannose, 0.5 part of disodium calcium ethylene diamine tetraacetate and water for injection to 1000 parts and freeze-drying, the redissolution time of pantoprazole sodium for injection is short, related substances in the solution are not increased, the content is not obviously reduced, and the pantoprazole sodium for injection is suitable for clinical application. The stability is good in the transportation and storage process, the compatible solution can be stored for a long time during clinical use, clinical use becomes more convenient, and the problems of medication potential safety hazards, side effects and the like brought to patients due to impurity increase, content reduction and the like are also greatly reduced.

The invention relates to the technical field of biomedical materials, in particular to silver-containing collagen sponge and a preparation method thereof.The preparation method comprises the following steps that S1, silver salt is added into a collagen solution, and a first solution is obtained; s2, glutathione and ethylene diamine tetraacetic acid disodium salt are added into the first solution, and a second solution is obtained; s3, adding sodium alginate and chitosan into the second solution, and homogenizing to obtain a homogenized solution; and S4, carrying out freeze drying on the homogenized liquid to obtain the silver-containing collagen sponge. The preparation method of the silver-containing collagen sponge provided by the invention is simple in process, good in reproducibility and suitable for large-scale production; according to the silver-containing collagen sponge, chelating is stably combined with a microcapsule coating composite system, oxygen is isolated from silver ions, the oxidation rate of the silver ions is remarkably reduced, meanwhile, slow release of silver is achieved, and therefore the antibacterial time efficiency of the silver-containing collagen sponge can be prolonged.

The invention relates to the technical field of water hardness detection, in particular to a water hardness detection reagent as well as a preparation method and application thereof. Comprising the following raw materials in parts by weight: 0.8-1.5 parts of ethanolamine, 5-7 parts of diethanolamine, 35-40 parts of triethanolamine, 52-57 parts of an ammonia-ammonium chloride buffer solution, 1.5-2 parts of a chrome black T indicator, 1-1.5 parts of ethylene diamine tetraacetic acid disodium magnesium salt, 0.1-0.3 part of sodium chloride and 0.1-0.3 part of a formaldehyde aqueous solution. The prepared water hardness detection reagent has the characteristics of good stability and high sensitivity.

The invention discloses a method for stably fixing sulfides in water for a long time. The method comprises the following operation steps: step 1, preparing a composite reagent; 2, fixing the water sample; 2, fixing the water sample; step 4, automatic detection; step 5, quality control; the invention has the following beneficial effects: through steric hindrance effect and electrostatic repulsion effect of sodium carboxymethyl cellulose, zinc sulfide is uniformly dispersed in the form of 50-200nm nanoscale particles, particle aggregation and sedimentation are effectively inhibited, long-acting preservation of more than or equal to 7 days is realized, pH value adjustment or addition of other chemical reagents is not needed during preservation, and the method is simple and convenient to operate. A dynamic equilibrium system is established through coordination competition of disodium ethylene diamine tetraacetate and zinc ions, and when the concentration of sulfide in a water sample changes in a range of 0.1 mg / L-50 mg / L, the release rate of the zinc ions can be adaptively adjusted, so that complete generation of zinc sulfide precipitates is ensured, and a wider concentration detection range is covered.

The present application belongs to the field of dandruff removal, and particularly relates to a dandruff removal composition, a preparation method and application thereof. The raw materials of the dandruff removal composition include a dandruff removal component and auxiliary materials, the raw materials of the dandruff removal component are Schisandra chinensis and Evodia rutaecarpa, and the auxiliary materials include phase A, phase B, phase C and phase E, phase A is selected from water and sodium laureth sulfate, phase B is selected from one or two of glycerol and polyquaternium, phase C is selected from one or more of sodium cocamphopropionate, sodium chloride, disodium EDTA, cocamide MEA, phenoxyethanol, ethylhexylglycerin, PEG-7, glyceryl cocoate and panthenol, and phase E is selected from one or more of citric acid, sodium chloride and water. It is found through repeated test research that Schisandra chinensis and Evodia rutaecarpa used in the dandruff removal component of the present application can synergistically promote the reduction of the number of dandruff of subjects with dandruff problems, not only achieving a good anti-dandruff effect, but also significantly inhibiting scalp itching.

The invention provides an acidic decolorizing agent. The invention relates to an adhesive which comprises the following components in parts by weight: 30-34 parts of hydrolyzed wheat starch, 28-32 parts of wheat flour, 12-16 parts of potassium persulfate, 4-8 parts of ammonium persulfate, 3.5-7.5 parts of hydroxyethyl cellulose, 1.5-5.5 parts of silicon dioxide, 1-2 parts of hydroxypropyl trimethyl ammonium chloride hydrolyzed collagen, 0.8-1.3 parts of guar gum and 0.8-1.3 parts of sodium metasilicate. The invention relates to an anti-rust agent, which is prepared from the following components in parts by weight: 0.8 to 1.3 parts of magnesium stearate, 0.8 to 1.3 parts of magnesium carbonate, 0.8 to 1.3 parts of disodium ethylene diamine tetraacetate, 0.08 to 0.12 part of hydrolyzed keratin, 0.4 to 0.8 part of sodium laureth sulfate, 0.3 to 0.5 part of titanium dioxide, 0.3 to 0.5 part of glucose and 0.1 to 0.3 part of mineral oil.

The present invention relates to the technical field of element content detection, and in particular to a method for determining the gold content and other element contents in a gold alloy product. The method comprises the following steps: 1) dissolving a sample, adding hydrochloric acid, disodium ethylenediaminetetraacetic acid, tartaric acid, oxalic acid, and perchloric acid to prepare a stable sample solution; 2) preparing a calibration solution composed of the main element contents; 3) measuring calibration samples of gold, silver, copper, zinc, nickel, iron, manganese, and chromium with known concentrations to determine the test conditions for the above elements; and 4) testing the calibration solution samples to construct a calibration working curve showing the relationship between X-ray fluorescence spectrum intensity and the gold, silver, copper, zinc, nickel, iron, manganese, and chromium content. The calibration curve is then used to test the sample to determine the gold, silver, copper, zinc, nickel, iron, manganese, and chromium contents in the gold alloy product to be tested. This method can quickly and accurately determine the gold, silver, copper, zinc, nickel, iron, manganese, and chromium contents in gold alloy products with a gold content of 0.15% to 99.9%.

The application relates to the technical field of water hardness detection, in particular to a water quality hardness detection reagent, a preparation method and application thereof, the water quality hardness detection reagent comprises the following raw materials in parts by weight: ethanolamine 0.8-1.5 parts, diethanolamine 5-7 parts, triethanolamine 35-40 parts, ammonia-ammonium chloride buffer solution 52-57 parts, chrome black T indicator 1.5-2 parts, ethylenediaminetetraacetic acid disodium magnesium salt 1-1.5 parts, sodium chloride 0.1-0.3 parts and formaldehyde aqueous solution 0.1-0.3 parts. The water quality hardness detection reagent prepared by the application has the characteristics of good stability and high sensitivity.

The application discloses a copper strip surface cleaning agent, which is composed of the following components in percentage by mass: 10-20% of citric acid, 5-10% of ammonium oxalate, 5-10% of disodium ethylenediaminetetraacetate, 1-5% of polyhydroxy alcohol, 0.5-2% of persulfate, 0.5-1.5% of surfactant, and the balance of water. Compared with traditional strong acid cleaning, the copper strip surface cleaning agent is safe and environmentally friendly, has no damage to human body and clothes, has no irritating odor, has no pollution to the environment, and has the removal effect of the oxide on the surface of the copper strip reaching the effect of the strong acid cleaning. In the case that degreasing is not complete, the cleaning effect is even better than that of the strong acid cleaning. The copper strip surface is not damaged, the strip surface is not corroded by over pickling, and the copper strip surface has a certain passivation effect.

The application discloses a kind of iron silver diatomic catalyst based on ligand complexation effect construction and its preparation method and application, belong to material science and environmental engineering technical field;The method utilizes the difference between iron, silver atom and o-phenanthroline, ethylenediamine tetraacetic acid disodium ligand complexing rate and capacity, optimizes the adding order of ferric nitrate and silver nitrate, accurately controls the complexation mode of metal atom and ligand oxygen / nitrogen atom;And further with the directional assembly and melting point reduction effect of intermolecular hydrogen bond, successfully prepare the diatomic catalyst that iron silver atomic spacing and coordination configuration can be controlled;The design essentially strengthens the synergistic catalysis of iron silver double site, realizes the cascade activation of peroxymonosulfate internal oxygen atom, and then generates singlet oxygen with high yield and high output;The application provides an efficient new material and feasible new technical scheme for the advanced treatment of typical phenolic and antibiotic wastewater.

This invention discloses an environmentally friendly descaling and cleaning agent for subsea pipelines, its preparation method, and its application method. The descaling and cleaning agent comprises the following components by mass percentage: Agent A: 50%–90% tetramethylolphosphine sulfate; balance water. Agent B: 1%–12% disodium ethylenediaminetetraacetate; 1%–8% thiourea; 1%–5% ammonium chloride; 0.1%–8% alcohol ether carboxylates or alcohol ether sulfates; 0.8%–11% alkylphenol polyoxyethylene ether; balance water. The descaling and cleaning agent of this application consists of two agents, has a near-neutral pH, and is an environmentally friendly descaling agent. Furthermore, this descaling and cleaning agent can effectively prevent the generation of sulfides and high-valence ferric ions, effectively controlling corrosion.

The invention discloses a deodorization composition, a preparation method thereof and application of the deodorization composition in deodorization of cat excrement. The deodorization composition is prepared from the following components in parts by weight: 15 to 30 parts of compound enzyme, 5 to 35 parts of N, N '-bis (3-picolyl) thiourea, 5 to 10 parts of chitosan / pectin embedded lactobacillus plantarum, 2 to 3 parts of zinc ions, 0.01 to 0.1 part of citric acid, 0.02 to 0.2 part of disodium ethylene diamine tetraacetate and 19.7 to 78.97 parts of water, the pH value of the deodorization composition is 5 to 6. The deodorization composition has a uniform and stable system, and the conditions of layering, flocculent precipitation and the like are avoided. The deodorant composition not only has an excellent short-term removal rate for cat excrement such as cat urine and cat excrement, but also can take effect quickly, and has an excellent long-term removal rate.

This invention belongs to the technical field of functional personal care products, and specifically relates to a highly efficient and stable natural sulfur hot spring bath concentrate formula and its preparation process. The bath concentrate formula, by mass percentage, comprises the following components: 35.0-65.0% sulfur hot spring active concentrate, 0.001-0.01% sodium selenite, 0.1-1.0% sodium thiosulfate, 0.05-0.2% disodium EDTA, 0.5-3.0% cationic liposomes, 0.2-0.8% carrageenan, 0.5-3.0% calcium source, 0.3-2.0% magnesium source, 0.1-0.5% bisabolol, 0.1-0.5% dipotassium glycyrrhizate, 0.2-1.5% citrate-sodium citrate buffer pair, 3.0-8.0% polyol, 0.1-0.3% β-cyclodextrin-encapsulated fragrance, and deionized water to 100%. A liquid bath concentrate was obtained using natural sulfur hot spring water as the water source, which fully retains its active sulfide spectrum and characteristic mineral ions, and can be stored for a long time at normal temperature and pressure. It has the advantages of high stability, high polysulfide content, slow release, and no irritation.

The invention relates to the technical field of fertilizer preparation, in particular to a chelated selenium leaf fertilizer and a preparation method and application thereof. The chelated selenium leaf fertilizer is obtained by mixing a chelated selenium solution and a chelated selenium auxiliary agent in equal mass, wherein the chelated selenium solution is prepared from the following raw materials in parts by mass: 1-5 parts of sodium tetraborate, 3-8 parts of sodium hydroxide, 5-10 parts of selenium dioxide, 5-10 parts of fulvic acid, 6-15 parts of a solvent and 200-300 parts of water; the chelated selenium additive is prepared from the following raw materials in parts by mass: 5 to 10 parts of sodium potassium tartrate tetrahydrate, 5 to 10 parts of disodium EDTA (Ethylene Diamine Tetraacetic Acid), 1 to 5 parts of a magnesium source, 1 to 5 parts of a potassium source, 0.2 to 1.5 parts of a manganese source, 1 to 3 parts of a copper source, 1 to 5 parts of a nitrogen source, 6 to 15 parts of a solvent and 200 to 300 parts of water. According to the chelated selenium leaf fertilizer, the selenium content in agricultural products is increased, and meanwhile the yield of the agricultural products is greatly increased.

The present invention belongs to the field of metallurgy technology and relates to a comprehensive recovery method for antimony-containing gold concentrate, comprising the following steps: S1: mixing and slurrying the antimony-containing gold concentrate and an antioxidant, then adding sodium sulfide and sodium hydroxide to obtain a slurry, and obtaining a leachate and a leaching residue after the reaction; S2: electrolyzing the leachate obtained in step S1 to obtain crude antimony and a barren solution; wherein, in step S1, the antioxidant is a mixture of sodium ascorbate and disodium ethylenediaminetetraacetic acid. The present invention utilizes Na2S to leach antimony from the antimony-containing gold concentrate under alkaline conditions. In order to avoid the formation of S during the leaching process, 2‑ Oxidized to S x 2‑ , and then reacts with Au to form AuS soluble in alkaline solution x The present invention adds an antioxidant during the leaching process, which can significantly reduce the leaching of gold in the antimony-containing gold concentrate and improve the gold recovery rate.

The invention relates to the field of working standard reagents, and particularly discloses a method for improving the quality of disodium ethylene diamine tetraacetate, which comprises the following steps: dispersing a disodium ethylene diamine tetraacetate crude product in water, adjusting the pH value of a system, adding sodium carbonate, separating out salt, adding a negative electricity polymer, stirring, standing, adding activated carbon for adsorption, and filtering to obtain a filtrate, the negative electricity polymer comprises one or more of sodium polyacrylate, polyaspartic acid, sodium polystyrenesulfonate and sodium alginate, performing ultrafiltration on the filtrate obtained in the step I, adding absolute ethyl alcohol into the obtained liquid phase, controlling the volume ratio of the absolute ethyl alcohol to the filtrate to be 1.5: (2-4.5), filtering after stirring, and drying the obtained filter residue to obtain the negative electricity polymer. The ethylenediamine tetraacetic acid disodium salt is obtained. According to the method disclosed by the invention, a plurality of steps are linked with one another, so that a tight and smooth overall scheme is formed, and the purity of the ethylene diamine tetraacetic acid is improved to 99.5% or above.

The invention belongs to the technical field of electronic materials, and discloses a magnesium-strontium double-doped calcium fluoride crystal and a preparation method and application thereof.The method comprises the steps that firstly, disodium ethylene diamine tetraacetate is chelated with calcium and magnesium ions, and the calcium and magnesium ions and villiaumite are subjected to a coordination exchange reaction to prepare a magnesium-doped calcium fluoride microsphere precursor; regulating and controlling hydrolysis of 3-aminopropyltriethoxysilane through an absolute ethyl alcohol-deionized water mixed solvent, and realizing uniform anchoring and deposition of strontium ions by virtue of an interface connection effect of the 3-aminopropyltriethoxysilane, so as to construct a magnesium-strontium double-doped precursor with a core-shell structure; carrying out hot pressed sintering in a CF4 / Ar mixed atmosphere to obtain a high-density polycrystalline blank; and finally, finishing crystal oriented growth by adopting a Bridgman-Stockbarger method. Through the synergistic effect of the components in the whole process, gradient uniform doping of magnesium and strontium ions is achieved, lattice distortion is effectively eliminated, the optical uniformity, the anti-laser-damage threshold value and the mechanical stability of the crystal are improved, and the prepared crystal can be widely applied to manufacturing of special electronic materials such as semiconductor wafers and the like and has good industrialization prospects.

The invention discloses a moisturizing, anti-wrinkle and anti-aging multi-effect polypeptide composition and a preparation method thereof, and belongs to the technical field of polypeptide composition preparation. The polypeptide composition is prepared from the following components: 60 percent of process water, 5 percent of glycerol, 3 percent of butanediol, 3 percent of betaine, 0.5 percent of p-hydroxyacetophenone, 5 percent of 1, 2-hexanediol, 2 percent of water-soluble silicone wax, 0.5 to 3 percent of PEG / PPG / polybutylene glycol-8 / 5 / 3 glycerol, 0.5 percent of polyacrylate cross-linked polymer-6, 2 percent of panthenol, 0.5 percent of carnosine, 0.2 percent of xanthan gum, 0.1 to 0.5 percent of dipotassium glycyrrhizinate, 3 percent of lactic acid, 0.1 to 0.5 percent of disodium EDTA (Ethylene Diamine Tetraacetic Acid), 0.5 percent of sodium hyaluronate and 0.2 percent of hydroxyethyl cellulose. According to the polypeptide composition, various moisturizing and hydrating essence components can achieve a synergistic effect, the skin water shortage state can be improved, fine wrinkles can be reduced, the skin can become elastic, tender, tight, moisturized and brightened, and the young muscle state is rejuvenated, the polypeptide composition does not emit moisture after being used by a user, and the moisturizing and hydrating effects are good.

The present invention relates to the field of pharmaceutical chemistry technology, specifically, to a crystallization process for p-aminosalicylic acid. It comprises the following steps: p-aminosalicylic acid crude product is dissolved in a solvent, disodium edetate is added synchronously to form a homogeneous solution; polyvinyl pyrrolidone and sodium lauryl sulfate are dissolved in water to form a composite micelle system, and acetone is added to form an anti-solvent phase; the anti-solvent phase is added dropwise to the homogeneous solution, and target crystal form seed is injected; the solution is subjected to solid-liquid two-phase separation; solid phase is treated to obtain wet crystals; wet crystals are processed by a vacuum belt dryer to obtain p-aminosalicylic acid crystals. In the present invention, metal-catalyzed decarboxylation is blocked by disodium edetate, free impurities are adsorbed with polyvinyl pyrrolidone-sodium lauryl sulfate micelles, and polyvinyl pyrrolidone can stabilize the target crystal lattice, and sodium lauryl sulfate can induce crystal growth, so as to stably output low residual high-purity pharmaceutical-grade p-aminosalicylic acid.

This invention discloses a neutral dissociation agent and its preparation method for detecting the content of 25-hydroxyvitamin D in human blood samples, belonging to the field of biomedical detection technology. The dissociation agent is composed of disodium EDTA, sodium dodecyl sulfonate, dithiothreitol, hexadecyltrimethylammonium bromide, and hydroxypropyl-β-cyclodextrin dissolved in 50 mM tris(hydroxymethyl)aminomethane buffer, with the mass-volume ratios of each component being 0.5%-1%, 0.5%-1%, 0.2%-0.5%, 0.2%-0.5%, and 0.2%-0.5%, respectively. During preparation, each component is dissolved according to the steps, and the pH is adjusted to 7.4. This dissociation agent exhibits mild dissociation conditions, does not damage protein activity, has high dissociation efficiency, and is non-corrosive and non-toxic. The detection results show high specificity and sensitivity, with a coefficient of variation ≤6%. It can be directly integrated into automated detection processes and is suitable for large-scale clinical and research applications.

This invention discloses a nickel-aluminum catalytic method for synthesizing a pentavalent lactam containing a quaternary carbon chiral center. Under a nitrogen atmosphere, a secondary phosphooxy ligand, a metal catalyst Ni(cod)₂, a formamide compound, and a solvent are sequentially added to a reaction flask. A Lewis acid is then added, and the mixture is stirred at a specified reaction temperature. After the reaction is complete and cooled to room temperature, the mixture is washed with 2 mL of a 5 wt% ethylenediaminetetraacetic acid disodium salt aqueous solution. The mixture is separated, and the organic phase is dried over anhydrous sodium sulfate. Column chromatography is then used to separate the pentavalent lactam containing the quaternary carbon chiral center. This method involves no atomic loss, generates no other waste, and exhibits high yield and selectivity.

The invention discloses a gas well potential tapping and yield increasing composite technology, and relates to the technical field of petroleum and natural gas development, the gas well potential tapping and yield increasing composite technology comprises the following three steps: S1, plugging removal liquid (18-22% of composite chelating acid, 0.6-1.0% of a nanometer surfactant, 0.4-0.7% of a biological enzyme preparation and the balance of formation water, and the chelating acid is prepared from glycolic acid, EDTA disodium and ammonium fluoride according to the ratio of 18-22: 6-8: 4-7); s2, performing 3-5 stages of fracturing circulation, and injecting prepad fluid, sand-carrying fluid and a temporary plugging agent at each stage; and S3, supercritical gas is injected step by step, the initial pressure is 0.65-0.75 times of formation pressure, the final pressure is 1.3-1.45 times of formation pressure, and the pressure is increased by 0.02-0.03 MPa / min. According to the invention, pre-blocking removal and multi-stage temporary blocking fracturing are cooperated, a complex fracture net is made by means of a compound agent, pulse blocking removal and improvement of liquid spreading, and a bi-component temporary blocking agent and modified ceramsite; a desorption activation program is combined with controllable gradient supercritical gas injection, mixed gas activates adsorption gas, supercritical gas channeling prevention is controlled, real-time monitoring is carried out, traditional pain spots are broken, the recovery rate of residual gas is increased, and the stable production period of a gas well is prolonged.

This invention discloses a chromogenic solution and kit for visual colorimetric detection of free ferrous protoporphyrin in cells. The chromogenic solution consists of reagents A, B, and C: Reagent A is prepared with deionized water and contains NaCl, Proclin 300, and glycerol; Reagent B is prepared with an acetate-sodium acetate buffer at pH 4.0 and contains glycerol, Triton X-100, β-cyclodextrin, disodium EDTA, citric acid, ethanol, and 3,3',5,5'-tetramethylbenzidine; Reagent C is prepared with an acetate-sodium acetate buffer at pH 4.0 and contains 2.0-4.0% hydrogen peroxide and 35.0-50.0% ethanol. The chromogenic solution of this invention has a lower background value and can detect the content of free ferrous protoporphyrin in cells within 10 minutes by visual colorimetry, with a detection limit as low as 10 nmol / L. The chromogenic stability is maintained for 12 hours, making it suitable for rapid assessment of cellular pathological conditions.

This invention discloses a method for detecting L-5-methyltetrahydrofolate content with magnesium ion interference resistance, comprising the following steps: S1. Sample pretreatment: S11. Using phosphate buffer containing antioxidants, disodium EDTA, and sodium citrate as the extraction reagent, the sample is ultrasonically extracted in an ice-water bath at 2-6°C under light-protected conditions; S12. Extraction is performed using an aqueous two-phase extraction system; S2. HPLC detection: A reversed-phase chromatographic column is used, with gradient elution using mobile phase A and mobile phase B; mobile phase A is an aqueous solution of potassium dihydrogen phosphate containing antioxidants, sodium citrate, and disodium EDTA, and mobile phase B is methanol. This invention solves the problems of peak tailing, signal suppression, and matrix interference in the detection of L-5-methyltetrahydrofolate in complex magnesium-containing systems by synergistically dissociating the magnesium-folate complex through pH control and a composite masking agent, combined with aqueous two-phase extraction to purify the matrix, and optimized HPLC separation conditions.

The invention discloses an acid-base regulation diatom-based modifier as well as a preparation method and application thereof. The acid-base regulation diatom-based modifier is prepared from the following raw materials in parts by weight: 50 to 77 parts of a diatom matrix, 6 to 12 parts of modified zeolite powder, 8 to 13 parts of a pH regulator, 2 to 6 parts of a pH buffer agent, 1 to 3 parts of disodium EDTA (Ethylene Diamine Tetraacetic Acid) and 0.5 to 2 parts of a stabilizer. A specific preparation method is adopted, so that all the components synergistically exert advantages. When being applied to soil improvement, the soil conditioner can effectively regulate the soil pH value, improve the soil structure, increase the air permeability and water-retaining property, improve the soil fertility and realize sustainable improvement and utilization of the soil.

The invention discloses a reagent for detecting the hardness of industrial boiler water and application of the reagent, and belongs to the technical field of water quality analytical chemistry. The hardness reagent disclosed by the invention is prepared from the following components in parts by mass: 0.01 to 0.05 part of chrome black T, 0.01 to 0.03 part of disodium ethylene diamine tetraacetate, 1.5 to 2.0 parts of a pH regulator, 0.05 to 0.15 part of a synergist, 6 to 8 parts of an anti-caking agent and 1 to 1.5 parts of a stabilizer. According to the final color of the reaction liquid, the numerical range of water sample parameters is given, industrial boiler water quality monitoring can be conveniently guided, the detection operation is rapid, the deviation of the result compared with a national standard method is smaller than or equal to 10%, and the method is suitable for on-site hardness detection; a waterproof reference color card is matched, the color developing result is visual and easy to understand, the problems that the threshold of existing detection technicians is high, efficiency is low, reagents are difficult to purchase and the like can be effectively solved, and the method is suitable for water quality dynamic regulation and control of industrial boilers and circulating water systems.