60 results about "IODINE/POTASSIUM IODIDE" patented technology

The invention discloses a trace element solution, which comprises at least one metal selected from the group comprising selenium, copper, zinc, manganese and chromium and which comprises a concentration of the metal(s) of at least 60 mg / ml. The solution further comprises at least one compound selected from the group comprising iodine, potassium iodide, sodium iodide, iron, iron chloride, zinc oxide, manganese sulphate, sodium selenite, copper carbonate, sodium carbonate, anhydrous disodium EDTA and sodium hydroxide. The trace element solution is prepared by a method consisting essentially of the steps of preparing a MnCO3 mixture in a container; adding an EDTA / NaOH mixture to the container and subsequently adding at least one metal compound; and adding Na2SeO3 to the container to obtain the trace element solution. The method also comprises the step of adding CrCl3.6H2O to the trace element solution.

The invention discloses an oil-tea camellia husk polysaccharide which has the following characteristics: a. physicochemical properties: the polysaccharide is brown powder with small odor and is easily-soluble in water and not soluble in organic solvents such as chloroform and ether, the polysaccharide is orange if reacting with phenol-sulfuric acid, shows a negative reaction with Fehling reagent and shows a negative reaction with iodine-potassium iodide; b. composition of the polysaccharide: the content of the polysaccharide is 30 percent to 50 percent; the distribution range of molecular weight is 7,000 to 200,000,0Da; the polysaccharide is prepared by the following six kinds of monosaccharide: glucose, fucose, arabinose, galactose, seminose and rhamnose. The oil-tea camellia husk polysaccharide is used as free radical scavenger or used for preparing medicaments with anti-tumor function for curing tumors.

An environment protection type nutritive bactericide for agricultural crops is prepared from iodine, potassium iodide, salicylic acid, benzoic acid, emulsifier and solvent. It is applied by spraying, irrigation, or coating. Its preparing process is also disclosed.

The invention discloses a method for recovering gold from iodine-potassium iodide leachate. Concentrated sulfuric acid (H2SO4) and hydrogen peroxide are added into the leachate containing iodine, potassium iodide and gold iodide, the two reagents are reacted with iodine ions in the leachate to generate iodine, the iodine is volatilized out of a container at high temperature, and after the iodine is volatilized, the leachate is transparent; and the leachate is continuously heated, the two reagents also can convert gold in an ion state into gold in an atomic state to fulfill the aim of reducing the gold, and excessive reagents are decomposed at high temperature. The invention aims to control the types and weight of the added chemicals, simplify the operating process and improve the purity of the recovered gold; and by the method, the utilization rate of the gold can be greatly improved.

The invention discloses a preparation method of an amylose inclusion complexation carrier. The method comprises the following steps: preparing a starch raw material into starch milk by a disodium hydrogen phosphate-sodium dihydrogen phosphate buffer solution, adjusting the pH to 4.5-6.5, putting the starch milk in an enclosed container for gelatinization; after the gelatinization, cooling the gelatinized liquid, adding a debranching enzyme, stirring and reacting at 45-65 DEG C for 1-3 hours; adjusting the pH to 5.5-7.0, adding alpha-amylase, stirring and reacting at 45-110 DEG C for 1-10 min, performing enzyme deactivation; adding an iodine-potassium iodide mixed solution prepared by water, controlling the concentration of the potassium iodide in the mixed solution to be 5-20 mg / mL; performing thermal insulation and stirring at 60-80 DEG C for 10-20 min; performing neutralization to obtain a pH of 6.0-6.5, drying, and crushing. The amylose carrier prepared by the invention can realize inclusion complexation of substances of essence perfume, aliphatic acid, inorganic micromolecules, and the like, and has wide applications in industries of food, medicine, cosmetics, chemical engineering, and the like.

The invention discloses a safe broad-spectrum povidone-iodine preparation and a preparation method and application thereof. Each 1000g of the safe broad-spectrum povidone-iodine preparation is prepared from 10 to 15.5g of polyvinylpyrrolidone, 5.5 to 7.5g of refined iodine, 1.8 to 8.3g of potassium iodide, 0.01 to 3g of potassium iodate, 0.01 to 1.25g of a surfactant, 2 to 8g of a pH regulator andthe balance of water. A weight ratio of the polyvinylpyrrolidone to the effective iodine is (1.6-3.6): 1. The safe broad-spectrum povidone-iodine preparation with a proper dosage cannot cause poisoning and digestive tract injury after being orally taken, can be used for preventing and treating diseases of animals, reducing antibiotic abuse and improving human food safety, and is good in stability, not easy to decompose under the illumination condition and long in preservation time.

The invention discloses a method and device for rapidly leaching out gold in a waste circuit board. The method comprises the following steps: pre-treating the circuit board with nitric acid; adding an iodine-potassium iodide solution in a reactor, and sealing the reactor; starting a heater, opening a CO2 gas cylinder and starting a pressure pump, and introducing CO2 after pressurized into the reactor; and after reaction is finished, opening an extraction valve at the outlet formed in the bottom of the reactor, separating a leaching solution from solid phase residues, and enabling the leaching solution to enter an extracted product bottle to obtain a gold-rich solution. According to the method disclosed by the invention, on the basis of the traditional potassium iodide-iodine method, a supercritical CO2 extraction system is adopted with KI and I2 as a cosolvent, hydrogen peroxide, serving as an oxidant, is not needed, the gold leaching time is shortened to 15mins and by 16 times compared with the traditional method, and the leaching efficiency of the gold is improved to 99.9 percent.

The invention provides a long-branched-carbon-chain triazine ultraviolet absorbent compound and a preparation method thereof. The reaction of the preparation method is as shown in the specification, wherein n is 10-15, R1 is H or CH3, R2 is H or CH3, R3 is H or CH3 and R4 is H or CH3. A synthesizing method of the long-branched-carbon-chain triazine ultraviolet absorbent compound includes: dissolving triazine fragments into an organic solvent such as benzene, toluene, xylene, tetrahydrofuran and 1, 2-dichlorobenzene; adding C13-C18 long-branched-carbon-chain glycidyl ether, adding a catalyst such as iodine and potassium iodide, and adding a cocatalyst such as 18-crown-6, PEG400, tetrabutyl ammonium bromide, tetrabutyl ammonium chloride and benzyl triethyl ammonium chloride; slowly heating to 60-140 DEG C, keeping the reaction for 12-24 hours; cooling after the reaction, washing with water, concentrating and crystalizing to obtain the long-branched-carbon-chain triazine ultraviolet absorbent compound. The long-branched-carbon-chain triazine ultraviolet absorbent compound is novel in structure, simple in preparation operation and extremely high in commercial application value.

The invention belongs to the technical field of plant cytology, and particularly relates to a method for identifying haploid regenerated by brassica napus microspores simply, conveniently and quickly in batch in the early stage in a method of chloroplast counting. The method is characterized by comprising the following steps of: inoculating an embryoid cultured by in-vitro microspores onto a B5 culture medium; when the embryoid is grown into a complete plant, cutting the fifth even leaf sterilely; dyeing the lower epidermis tissue in the middle of the leaf by using iodine-potassium iodide; observing chloroplasts of guard cells of air vents by using an optical microscope; and recording the number of the chloroplasts of 10 air vents on each prepared leaf (namely the same leaf), wherein more than 7 air vents have 6 to 8 chloroplasts, and the plants of the chloroplasts are the haploid. By the method, the problem of long-time subculture of the haploid is solved, and in ten thousands of plants, the cost of reagents, lands and labors can be saved by 19,083 RMB. The method has a simple process, is easy to operate and low in cost and can be used for identifying the ploidy of a large number of plants, and one plant of seedling is identified only for 5 minutes, so the application efficiency of the double haploid (DH) technology is improved.

The invention provides a stereoscopic dyeing method for a cell slide of a Korla pear. The stereoscopic dyeing method is characterized by mixing a hematoxylin absolute ethyl alcohol solution with a concentration of 5%, a ferric trichloride solution with a concentration of 10%, an iodine-potassium iodide solution and a hydrogen peroxide solution with a concentration of 30% in a certain ratio and then carrying out dyeing on the cell slide of the Korla pear, wherein the cell walls are dyed brown, cell nucleuses are dyed atropurpureus, sclereids are dyed light yellow to brown, transfusion tissue is dyed light brown, and cells at each part are clear, visible and distinct, so stereoscopic dyeing effect is achieved. The stereoscopic dyeing method provided by the invention overcomes the defects that dyeing time is difficult to control, sclereids and transfusion tissue are indistinct, and boundaries of pulp cells are not clear in the prior art. The stereoscopic dyeing method is applicable to research on cells in each stable of growth and development of the Korla pear. The stereoscopic dyeing method is simple to operate and saves time and materials; and the prepared cell slide can be observed without a cover slip and a permanent slide for scientific research and teaching can be prepared from the cell slide after treatment with xylene.

The invention provides an ADP-glucose pyrophosphorylase mutant and a screening method and application thereof. The screening method includes the steps of firstly, synthesizing first chain cDNA; secondly, performing PCR amplification; thirdly, building AGPase large and small subunit cDNA prokaryotic expression vectors; fourthly, performing active screening. The method has the advantages that distant hybridization is performed on AGPase large subunit genes and small subunit genes from different species, and the recombinant gene expression vectors are obtained in a highly-controllable manner; escherichia coli glgC mutant strains are converted and inoculated to a Conberg enrichment solid culture medium, and iodine-potassium iodide dyeing is used to screen the high-activity ADP-glucose pyrophosphorylase mutant. The screening method is simple and practical and stable and reliable. The enzyme activity and glycogen content of the ADP-glucose pyrophosphorylase mutant are evidently higher than those of wild corn AGPase, evident change of the substrate affinity of the ADP-glucose pyrophosphorylase mutant is avoided, and the sensitivity of the ADP-glucose pyrophosphorylase mutant to activating agent is increased.

The invention relates to a dendrobium-devonianum-paxt-dried-stem polysaccharide with the effects of immunological enhancement and the hypoglycemic activity and a preparing method. The preparing method of the dendrobium-devonianum-paxt-dried-stem polysaccharide includes the steps of water extraction, alcohol precipitation, redissolving, drying or water extraction, ultra-filtration, drying and the like; the dendrobium-devonianum-paxt-dried-stem polysaccharide is characterized in that development does not occur when an iodine-potassium iodide reagent is added, the molecular weight is 3*10<5> Da-5*10<5> Da, a monosaccharide composition mainly comprises mannose, Acetyl-Man an a small amount of glucose (Glc), and the composition ratio of the mannose to the Glc is larger than 20:1; a glycosidic bond is mainly beta-1,4-Manp and beta-1,4-Glcp. The dendrobium-devonianum-paxt-dried-stem polysaccharide has the effects of immunological enhancement and the hypoglycemic activity, and can be used for developing relative products for treating immunosuppression and hyperglycemia.

The invention discloses a method for testing the content of tapioca starch in tapioca and maize mixed starch. The method comprises the steps as follows: firstly, an iodine-potassium iodide indicator is prepared, water is added to a to-be-tested sample, the mixture is oscillated and shaken fully and uniformly, heated to boiling for full gelatinization and cooled naturally to the room temperature, the iodine-potassium iodide indicator is extracted and dropwise added to a sample solution obtained in the previous step, and the mixture is oscillated and shaken fully and uniformly for developing; and a developed sample is centrifuged, supernate is taken, deionized water is used for comparison, a light absorption value y corresponding to the mixture is tested by a visible spectrophotometer, the y is substituted into a regression equation, and a content percentage of the tapioca starch in the tapioca and maize mixed starch is calculated.

The invention discloses a method for measuring a rice amylose content through singles grain of rice. The method comprises the following steps that: a plurality of rice varieties with different amylose contents are selected as reference samples; the amylose contents are measured separately; the rice of the reference samples and the rice of to-be-tested samples are dried until the weight of the rice of the reference samples and the rice of the to-be-tested samples is constant, a single grain of rice is selected from the reference samples and the to-be-tested samples respectively, and husked and weighed, and then, each husked grain of rice is added into a NaOH solution, and the NaOH solution with the husked grain of rice is vibrated; water is added into the NaOH solution until the total volume of the NaOH solution and the water reaches first volume; centrifugation is performed, and a supernate is obtained; and a glacial acetic acid solution and an iodine-potassium iodide solution are added into a centrifuge tube where the supernate is arranged, the volume of the glacial acetic acid solution and the volume of the iodine-potassium iodide solution are equal to the volume of the supernate; water is added into the centrifuge tube until the total volume of the supernate, the glacial acetic acid solution, the iodine-potassium iodide solution and the water reaches second volume, an obtained mixture stands still, a color developing solution is obtained; absorbance values is measured, with the amylose contents of the reference samples adopted as vertical coordinates, and the absorbance values of a grain of rice of 0.025g converted from the above absorbance values adopted as abscissas, a standard curve is drawn, or a regression equation is obtained; and the amylose contents of the to-be-tested samples are calculated according to the absorbance values of the grain of rice of 0.025g converted from the absorbance values of the to-be-detected samples. The method is unique and novel. With the method adopted, the rice amylase contents can be measured by single grains of rice, and measurement is accurate and reliable.

The invention discloses a test paper slip for testing adulterated milk rapidly. The test paper slip is characterized in that a starch test paper slip for composing the test paper slip is produced by the steps of taking 10 ml of an iodine-potassium iodide solution with an I2 concentration of 0.032 mol / mL and a KI concentration of 0.126 mol / mL, diluting it with equal amount of a solvent, immersing completely quantitative test paper into the diluted iodine-potassium iodide solution for 5 minutes, airing the test paper obtained from the previous step at a temperature of 5 to 6 DEG C in darkness, clipping, and preserving it in a dark place; a carbamide test paper slip for composing the test paper slip is produced by the steps of taking 6 ml of a sodium nitrite hydrochloric acid solution with a sodium nitrite content of 0.04%, adding 0.4 g of a Griess reagent into the sodium nitrite hydrochloric acid solution, mixing well, immersing completely quantitative test paper into the mixture for 10 minutes, taking out the immersed test paper, airing it in the shade, clipping, and preserving it in a dark place; an edible alkali test paper slip for composing the test paper slip is produced by the steps of taking 10 ml of a prepared Bromothymol Blue ethanol indicator with a Bromothymol Blue content of 0.04%, placing the indicator on a disk, immersing completely quantitative test paper into the indicator for 10 to 15 minutes, taking out it, airing it, clipping, and preserving it in a dry place; and a salt test paper slip for composing the test paper slip is produced by the steps of mixing well 15 ml of a silver nitrate solution with a silver nitrate concentration of 0.01 mol / mL and six drops of a potassium chromate solution with a potassium chromate content of 10% quickly, immersing completely quantitative test paper into the mixture for about 20 minutes, taking out it, airing the immersed test paper, clipping, and preserving it in a dry place. The test paper slip provided by the invention can carry out an on-site test on raw milk, has a high sensitivity of test and can produce an accurate test result.

The invention discloses an identification method of interspecific hybrids of Brassica campestris and Brassica napus, falling into the technical field of plant cytology. The method includes collecting the 4th-7th leaves of a plant in the seedling stage, tearing to collect hypoderm tissues of lower parts of the leaves, staining with iodine-potassium iodide solution, observing stomata under an optical microscope, measuring major / minor axis values of guard cells, calculating perimeter values of the guard cells with an ellipse model while observing and counting chloroplasts, recording 15 data per leaf, and identifying with parents as controls. For Brassica campestris, stoma guard cells have perimeter smaller than 58.90 micrometer and chloroplast count of 9-11; for Brassica napus, stoma guard cells have perimeter greater than 75.83 micrometer and chloroplast count of 19-20; while, for the to-be-identified material, if more than ten stomata simultaneously satisfy that guard cells have perimeter of 58.90-75.83 micrometer and chloroplast count of 14-16, it is determined that the plant is interspecific hybrids F1 of Brassica campestris and Brassica napus, otherwise it is false hybrid.

The invention provides a method for producing biological fertilizer by using marijuana degumming waste liquid. The method comprises the following steps: (1) adding the marijuana degumming waste liquid and starch which serve as indicators into a reaction container, and under an alkaline condition, dropwise adding an iodine-potassium iodide solution, and stopping adding the iodine-potassium iodide solution till reaction liquid turns into light blue; (2) adding activated carbon for adsorption, standing for 30 to 60 minutes, performing filtering, thus obtaining filtrate A, adding glucan for stirring for 1 to 2 hours, performing filtering, and removing filter residues, thus obtaining filtrate B; (3) adding the filtrate B into a fermentation tank, and then adding a microbial agent for fermentation, thus obtaining biofertilizer stoste; (4) adding beta-cyclodextrin into the biofertilizer stoste, and stirring for 2 to 4 hours, thus obtaining required biological fertilizer. According to the method, harmful substances can be removed from the degumming waste liquid, which is produced by electrochemical-enzymolysis united degumming, through chemical treatment, and gum in the degumming waste liquid is turned into the biological fertilizer easily absorbed by plants through biological fermentation.

The invention relates to an external compound preparation for curing tinea corporis as well as a preparation method and a content measuring method thereof, which solves the problems of slow therapeutic action and low curative ratio of the existing oral and injective therapy techniques in curing tinea corporis, tinea cruris, hand-foot tinea and other fungus infection diseases and the difficulties of the existing oral and injective therapy techniques that more factors and defects influence the product quality in the product production process. The external compound preparation of the invention is prepared by the following steps: dissolving benzoic acid, salicylic acid, iodine, potassium iodide, menthol and borneol with ethanol; and then respectively preparing into tinctures, linimentum, pigmentum, liniment, patch, ointment, gels, lotion, film agents and spray. In the preparation process, a closed preparation method is adopted, thereby preventing active components from volatilizing and ensuring the curative effect of drugs. The invention adopts the convenient and stable content measuring method, thereby ensuring the product quality, enabling the curative effect to be more definite, being capable of curing superficial fungus infection and having good effect for the tinea corporis, the tinea cruris and the hand-foot tinea.

The invention discloses a preparation method of cefozopran hydrochloride intermediate, which comprises the following steps: (1) the chemical name of the cefozopran hydrochloride intermediate is 7-amino-2-carboxy-8-oxo-5-thia-1-aza-bicyclo[4.2.0]octyl-2-alkenyl-3-yl]methyl]imidazo-[1,2-b]pyridazine onium salt; (2) by using 7-phenylacetamido-3-chloromethylcephalosporanate (GCLE) as the initial raw material, activating C-3 site with iodine, potassium iodide or sodium iodide hydrate, reacting with imidazo-[1,2-b]pyridazine disclosed as Formula (III), and carrying out after-treatment to obtain a compound; and (3) hydrolyzing the compound obtained in the step (2) under the action of phosphorous pentachloride to remove C-7 site protective group, hydrolyzing under the action of phenol to remove C-4 site phenylacetyl protective group, and carrying out after-treatment to obtain the cefozopran hydrochloride intermediate. The invention has the advantages of cheap and accessible raw materials, mild and manageable reaction conditions, high production safety and low production cost.

The invention relates to a method for rapidly identifying cassava autotetraploid, and belongs to the technical field of autotetraploid identification. The method for rapidly identifying the cassava autotetraploid comprises the following steps: 1) immersing a cassava leaf in a Carnot fixer to obtain a fixed cassava leaf; 2) taking the lower epidermis of the fixed cassava leaf obtained in step 1), and staining the lower epidermis in an iodine-potassium iodide staining solution to obtain a stained lower epidermis; and 3) microscopically observing the stained lower epidermis obtained in step 2), counting the number of chloroplasts in the guard cells, determining the cassava as an autoteraploid if the number of chloroplasts in more than 90% of the guard cells in the visual field is 7 or more, and determining the cassava as a diploid if the number of chloroplasts in more than 90% of the guard cells in the visual field is less than 7. The identification method has the advantages of low cost,high speed, high accuracy, and realization of efficient and rapid detection of the cassava autotetraploid.

The invention relates to the field of seed science and particularly relates to a rapid detection and evaluation method for mechanical injury of corn seeds. The rapid detection and evaluation method comprises preparation of a treating solution, pretreatment of mechanical injury detection of the seeds, developing treatment of the mechanical injury of the seeds, detection and evaluation of the mechanical injury of the seeds, quality predication of the seeds and the like. Based on the mechanical injury, starch layers of the corn seeds are exposed; when an iodine-potassium iodide solution is reacted with starch, starch iodide is formed and a blue special reaction is carried out; a developing reaction is combined with division of four corn seed mechanical injury grades to rapidly detect and evaluate the mechanical injury condition of the corn seeds; and on the basis, a seed activity correlation index fitting equation is established and is used for predicating the quality of corn sample seeds under different mechanical injury conditions. The rapid detection and evaluation method can be widely applied to the aspects including the detection of the corn seeds and the like, and provides evidences to the aspects including selection and determination of machining parameters in the production and processing of the corn seeds and the like.

The invention relates to the technical field of chip manufacturing, and discloses a VCSEL chip gold film etching solution and an etching method thereof, the etching solution comprises an iodine-potassium iodide-aqueous solution and an alcohol, the etching method of the VCSEL chip gold film uses the etching solution, and the etching method comprises the following steps: adding the alcohol into theiodine-potassium iodide-aqueous solution, stirring uniformly to obtain an etching liquid, then putting the wafer subjected to the electroplating process in the VCSEL chip manufacturing process into anetching solution, standing and soaking, and after sputtered gold is completely etched, washing with water and drying. According to the method, the gold film of the VCSEL chip is etched uniformly, themorphology of the gold film becomes better, and the problems that after the VCSEL chip is etched through the wet gold film, the morphology of a residual electroplated gold layer is irregular, and theroughness is large are effectively solved.

The invention belongs to the field of veterinary drug preparations, and particularly relates to an iodine glycerin nipple infusion special for dairy cattle nipples and a preparation method thereof. The iodine glycerin nipple infusion is prepared from iodine, potassium iodide, polyvinylpyrrolidone, Arabic gum, polyvinyl alcohol, glycerinum and purified water. According to the novel iodine glycerinnipple infusion and the preparation method thereof, the adsorbability of liquid medicine to skin is increased, in using of the soups, the phenomenon of liquid medicine dropping cannot occur, the liquid medicine can be well absorbed on the surface of the skin to form a layer of protective films, the using efficiency of the liquid medicine is greatly improved, and the bactericidal effect of medicated bath solutions is better met. At present, iodine glycerin nipple infusion is not reported by other patents and documents.

The invention discloses a rapid detection method for beta-cyclodextrin in a water sample. The rapid detection method comprises the steps of taking a to-be-detected water sample, adjusting a pH value and filtering the to-be-detected water sample through a filter membrane to obtain a to-be-detected sample solution containing beta-CD; adding the to-be-detected sample solution and an iodine-potassiumiodide color-developing agent, shaking well and standing; determining a light absorption value of the solution by taking a reagent blank as reference; drawing a standard curve of the beta-CD by takingdistilled water as reference and obtaining a standard curve regression equation, sensitivity and a detection limit; and substituting the light absorption value of the to-be-detected sample solution into the standard curve regression equation, thereby obtaining a concentration value of the beta-CD in the solution. A spectrophotometry of taking iodine-potassium iodide mixed liquid as a color-developing agent has the advantages of being convenient and rapid to operate, simple in pretreatment, high in antijamming capability, relatively low in detection limit, large in detection range, easily available in instrument and reagent and the like, and is very suitable for the requirements of rapid detection and analysis of the beta-cyclodextrin in relevant water samples in the fields, such as pharmaceuticals, foods, cosmetics, textiles and environmental protection.

The invention relates to an overall planning method for large-scale glutinous wheat grain identification. The method comprises the steps: transversely cutting wheat grains and enabling the section tobe away from a germ end; carrying out iodine-potassium iodide solution light dyeing on the cross section of the germ end, sucking up a dyed solution floating on the surface of the germ end, and then carrying out drying; and carrying out color identification on the dried germ end through professionals, reserving glutinous grains, directly sowing the dyed germ ends, and carrying out later agronomictrait investigation. According to the overall planning method for identifying the large-scale glutinous wheat grains, the preservation space of the wheat grains is greatly saved, and errors caused bydisordered control of the wheat grains are avoided; the color display is facilitated, and the color development error is reduced; and the drying treatment can enable the color identification to be more convenient, the storage of the germ end is more convenient, and the condition of seed germination or seed rotting caused in the storage process is reduced, so that the identification efficiency of theglutinous wheat is greatly improved.

The invention relates to the technical field of high-purity gold preparing, and provides a high-purity gold powder clean production method. Iodine, potassium iodide and potassium iodate are utilized for assisting gold powder dissolving, gold enters a solution in the form of auric potassium iodide, silver, copper and other metal impurities in the gold containing solution are removed through pH value adjusting and filtering, iodine gold acid radicals are extracted into an organic phase through extraction, gold is deposited in a simple substance form through reverse extraction, and accordingly high-purity gold powder is obtained. According to the provided method, the gold dissolving speed is high, the process is simple, the purity of the obtained high-purity gold powder can reach the 5N level, and the GB25933-2010 quality requirement is met. Furthermore, raffinate and reverse extraction liquid can be used for recycling iodine through electrolysis. An extraction agent can be cyclically used after being regenerated, and therefore the provided method is free of waste water emission, energy saving and emission reducing are conducted to the maximum degree, and accordingly a large amount ofenvironment protection facility investment and three-waste treatment cost is saved.

The invention relates to a method for measuring gold in secondary utilization waste, and belongs to the technical field of solid waste comprehensive utilization. The method comprises the steps of waste preparation, preparation of diluted hydrochloric acid extracting agent, stannous chloride and diluted hydrochloric acid are mixed to prepare a reducing agent; mixing the waste material with a diluted hydrochloric acid extracting agent and then carrying out leaching reaction; synchronously adding a stannous chloride solution reducing agent; the method comprises the following steps: taking gold-containing waste leachate, heating in a water bath, mixing the gold-containing waste leachate with a cyanide-free agent or an environment-friendly agent or an iodine-potassium iodide gold leaching solution, carrying out a leaching reaction, synchronously introducing micro-nano bubbles in the cyanide-free or environment-friendly leaching reaction to obtain gold-free waste leachate subjected to the leaching reaction, and calculating the leaching rate of gold according to a test result. The method has the advantages that the natural solubility of jarosite and stannate is brought into full play, andthe recovery rate of gold minerals is increased; a small amount of stannous chloride mixed solution is added as a reducing agent, the reaction is more sufficient and thorough through water bath heating, the leaching rate of gold minerals is ensured, and the gold recovery rate is high.

The invention provides an ADP-glucose pyrophosphorylase mutant and a screening method and application thereof. The screening method includes the steps of firstly, synthesizing first chain cDNA; secondly, performing PCR amplification; thirdly, building AGPase large and small subunit cDNA prokaryotic expression vectors; fourthly, performing active screening. The method has the advantages that distant hybridization is performed on AGPase large subunit genes and small subunit genes from different species, and the recombinant gene expression vectors are obtained in a highly-controllable manner; escherichia coli glgC mutant strains are converted and inoculated to a Conberg enrichment solid culture medium, and iodine-potassium iodide dyeing is used to screen the high-activity ADP-glucose pyrophosphorylase mutant. The screening method is simple and practical and stable and reliable. The enzyme activity and glycogen content of the ADP-glucose pyrophosphorylase mutant are evidently higher than those of wild corn AGPase, evident change of the substrate affinity of the ADP-glucose pyrophosphorylase mutant is avoided, and the sensitivity of the ADP-glucose pyrophosphorylase mutant to activating agent is increased.