111results about How to "High extraction recovery" patented technology

The present invention disclose a method of preparing high pure cathode copper by using PCB acid chlorine copper etching solution sewage, the main technical characteristics include applying sewage preprocess procedure to satisfy extraction need better, programming multi-extraction to improve extraction recovery rate of cooper, applying extractant with high selectivity avoid extraction entrainment design, washing procedure etc. to reduce carried impurity and dispel affect of chloride ion to electrodeposition. The electrodeposition applies additive to improve copper crystallinity, simultaneity, utilize residual useful ingredient in raffinate to prepare copper etching solution, arriving the objective of both prepare high pure cathode copper effectively and regenerative cycle use of the etching solution. The purity of the prepared cathode copper reaches 99.99%.

The invention discloses a method for extracting and separating vanadium and chromium from an alkaline aqueous solution. The method comprises the following steps: adding sulfate, carbonate and / or phosphate into the alkaline aqueous solution containing vanadium and chromium; adding an acidized amine extraction agent obtained by mixing with an acid solution in advance, mixing with the alkaline aqueous solution containing vanadium and chromium, and extracting vanadium, wherein chromium is not extracted and remains in the alkaline aqueous solution; after extraction, an organic phase loaded with vanadium can be subjected to reverse extraction by using an alkali metal salt, alkali metal hydroxides, sulfuric acid or aqueous nitric acid solution and can be acidized again to be recycled. According to the method disclosed by the invention, the vanadium and chromium can be extracted and separated from the concentrated alkaline aqueous solution with the pH value of more than 11, the single stage separation coefficient of the vanadium and chromium is large, the process flow is simple, and the extraction agent can be recycled.

The present invention discloses preparation process and use of Chinese paris rhizome total saponin as the effective component. The preparation process of the present invention is one simplified one comprising alcohol extraction, water precipitation, and deionized water washing and depositing. The preparation process has lowered alcohol consumption, obviously reduced production cost, no use of acetone, high effective component yield, high product purity and stable quality. The present invention also relates to the application of Chinese paris rhizome total saponin in preparing externally applied medicine for diminishing inflammation, eliminating swelling and relieving pain, antiviral medicine, and anti-tumor medicine.

The invention belongs to the technical field of endogenous substance detection and discloses a GC-MS (gas chromatography-mass spectrometer)-based method for quantifying eleven types of short-chain fatty acids in intestinal contents and fecal samples. By adoption of a hydrochloric acid solution prepared from saturated salt water for acidification, high-stability ethyl acetate for extraction and N-tert-butyldimethylsilyl-N-methyl trifluoroacetamide MTBSTFA for derivatization, the eleven short-chain fatty acids in mouse intestinal contents and fecal samples are quantified by a gas chromatography-mass spectrometer. The method is high in accuracy and precision and low in detection limit, can be used for quantitative detection of eleven types of short-chain fatty acids and can meet detection requirements on determination of major short-chain fatty acids in the mouse intestinal contents and the fecal samples. Moreover, the method is conducive to analysis and comparison of metabolic disposition laws of the short-chain fatty acids under normal and enteritis conditions and observation whether changes of the short-chain fatty acids can represent dynamic conditions of enteritis or not, thereby providing significant bases for potential biomarkers under the enteritis condition.

This invention is related to a kind of method for barrier separation extrating red colouring matter from sweet potato. It extrat red colouring matter solution from acidificated solution of the purple sweet potato's root tuber and other organs, segregation with purify multi-stage separation film and remove impurities to get concentrating liquid end product. The raw materials used in this invention has extensive source and can be operated at normal temperatureits energy consumption is little and has no hazardous or harmful solvent; it is non-polluted, healthy and safe, low cost; extrating recovery ratio of colouring matter is high, which is up to more than 80%. The stability of colouring matter is good, and the tone of the product is high; the secial resource purple sweet potato can be used to prepare newly drug, daily chemical industry and food stain.

The invention discloses a method for extracting gold, silver and copper from a mobile phone circuit board. The method comprises steps as follows: step one, pretreatment of the mobile phone circuit board: the circuit board is calcined, broken, screened and subjected to magnetic separation, and metal-enriched powder and non-metal impurities are obtained through pneumatic separation; step two, metal element analysis: content of metals such as silver, copper, aluminum, zinc and the like is tested by an atomic absorption spectrometer, and content of precious metals such as gold, platinum, palladium and the like is measured by an inductively coupled plasma emission spectrometer; step three, extraction and recovery of silver and copper; step four, thiourea leaching of gold: residues obtained after silver and copper leaching with nitric acid are put in a reactor and dissolved with thiourea and ferric sulfate, and content of gold is measured; step five, gold recovery: the solution obtained after thiourea leaching of gold is transferred to a reaction container, trisodium citrate and zinc powder are added, and filter residues are subjected to electrolytic refining of gold. According to the method, extraction and recovery rate of gold, silver and copper is high, the reaction speed is high, invested cost is low, little environmental pollution is produced, and industrialization is facilitated.

The invention relates to a method for recovering gallium, germanium and indium in a zinc replacement slag leaching solution through extraction. The method comprises the following steps that (1) neutralization and reduction are carried out, wherein a neutralizer is added into the zinc replacement slag leaching solution until the pH value reaches 1.5-1.8, then a reducing agent is added for reaction, and the content of the ferric ion (Fe <3+>) in the solution after reaction is controlled to be less than 1g / L; (2) extraction is carried out, wherein an extracting agent, a co-extracting agent and adiluent are mixed for extracting the obtained solution in the step (1); (3) reverse extraction of the gallium is carried out by using sulfuric acid; (4) reverse extraction of the indium is carried out by using hydrochloric acid; (5) reverse extraction of the germanium is carried out by using a fluoride aqueous solution; and (6) acidifying and regenerating are carried out, wherein the organic phase obtained by extraction in the step (5) is subjected to acidification regeneration treatment by using the sulfuric acid, and the regenerated organic phase is returned to the step (2) for extraction.The method for recovering the gallium, the germanium and the indium in the zinc replacement slag leaching solution through extraction has the advantages of being high in extraction recovery rate, simple in process and low in cost.

The invention provides a method and a system for recycling struvite from sludge, and solves a problem that lots of phosphorus resources are wasted as a large number of phosphorus elements exist in a solid phase and cannot be fully released or extracted during sludge treatment. The method comprises the following steps: firstly, performing ultrasonic treatment on thick sludge in an ultrasonic reaction tank while stirring; secondly, performing solid-liquid separation treatment on the thick sludge subjected to ultrasonic treatment through a diaphragm plate-and-frame filter press to obtain a dehydrated mud cake and a filtrate, and conveying the dehydrated mud cake out to be processed; thirdly, performing secondary filtration on the filtrate through a filtering device to obtain a secondary filtrate, and mixing the secondary filtrate with a magnesium source according to a molar ratio of Mg: P of being (1.3-1.5): 1 in a struvite reaction recovery device for struvite reaction treatment, wherein the reaction treating time is controlled to be 2 hours, and in the struvite reaction treatment process, struvite particles are precipitated out from the secondary filtrate; finally, collecting the precipitated out struvite particles after the struvite reaction treatment, allowing the secondary filtrate to flow back to a sewage treatment plant to be treated further.

The present invention discloses a method for enriching nature tetracycline antibiotics in aquatic products, and relates to a sample pretreatment in the field of food safety analysis. The method comprises the following steps: a 0.1 mol / L disodium ethylenediaminetetraacetate / Mcllvaine extraction buffer solution pretreatment, phenol or benzoic acid-modified polystyrene superparamagnetic bead adsorption, elution collection and the like, wherein an eluent can be directly added to liquid chromatography or LC-MS to carry out analysis. Compared with the traditional sample pretreatment method for tetracycline antibiotics in aquatic products, the method of the present invention has the following characteristics that: a sample pretreatment operation process is substantially simplified, a sample pretreatment time is shortened, the adsorbent use amount is reduced, and an extraction yield of the tetracycline antibiotics in the sample is increased.

The invention relates to a method for sub-critically extracting jasmine flower head fragrance essential oil, and the method is characterized by comprising the following steps: uniformly mixing active carbon granules absorbing jasmine flower head fragrance; putting processed active carbon into an extraction kettle; pressing a solvent in the extraction kettle into a separation tank to evaporate, vacuumizing till the pressure of the separation tank is decreased to negative pressure, and separating an extraction agent from jasmine flower fragrance components, thereby obtaining a fragrance extract; neutralizing solvent gas evaporated from an extraction solution in jasmine flower head fragrance absorption materials, liquifying after compressing and condensing, and flowing the liquid solvent in a solvent tank to be recycled. According to the invention, solvent residue does not exist; furthermore, the solvent can be recycled; the consumption of the extraction agent is reduced; the extraction yield can be above 90%; the purity is high; by means of gasification and liquidation of the solvent, heat exchange is carried out; the energy consumption is low; the extraction efficiency is high; the extraction time is greatly shortened by 2-5 hours; essential oil is extracted at normal temperature and under low-medium voltage; in addition, the manufacture cost of equipment is lower; the method disclosed by the invention is convenient for industrial production and has good market prospection.

The inventive aims to overcome the defects of the conventional enzyme inhibition-type biosensor and provides a visual identification method for detecting a micro-trace organophosphorus pesticide. When the detection method is adopted to detect the organophosphorus pesticide, on one hand, an adopted AChE liquid (Acetylcholine Esterase) is not subjected to solidification treatment, so that the highest activity of the AChE liquid is kept, and the detection sensitivity is improved; on the other hand, the extraction and recovery rate of the organophosphorus pesticide in a sample to be detected is improved through an adopted extracting solution, so that the detection sensitivity is improved to 0.01 ng / L. The detection method can be extensively applied to the detection of micro-trace organophosphorus pesticide residue in grains, vegetables, fruits and other agricultural products as well as the environment, and can also be used in the safety evaluation of agricultural products and the environment, the pollution condition monitoring of the organophosphorus pesticide, and the like.

The invention relates to a cinnamate type ultraviolet sun-screening agent molecular engram solid-phase extraction column as well as preparation and application thereof, and belongs to the technical field of solid-phase extraction of detection analysis. According to the invention, iso-octyl p-methoxycinnamate is adopted as a template molecule, methacrylic acid is adopted as a functional monomer, ethylene glycol dimethyl acrylic ester is adopted as a crosslinking agent, azodiisobutyronitrile is adopted as an initiating agent, cinnamate type ultraviolet sun-screening agent molecular engram polymer microspheres are obtained by virtue of a precipitation polymerization method, and the obtained polymer microspheres are filled into a solid-phase extraction column through a wet method. The molecular engram polymer solid-phase extraction column provided by the invention can selectively adsorb a cinnamate type ultraviolet sun-screening agent, and compared with a conventional solid-phase extraction column, the molecular engram polymer solid-phase extraction column overcomes the defect of poor selectivity of a conventional solid-phase extraction filler, is strong in adsorptivity, high in extraction recovery rate, and achieves efficient selective separation, enrichment and purification of a trace amount of the cinnamate type ultraviolet sun-screening agent in various environments and biological samples.

The invention provides a comprehensive recovery method of tungsten and molybdenum from the slag of bismith smelting furnaces and bismith reverberatory furnaces, comprising the following steps: soaking the slag of bismith smelting furnaces and bismith reverberatory furnaces with alkali to obtain alkali leaching solution, oxidizing the alkali leaching solution with H2O2, adjusting the PH value with acid, then adding MgCl2 and (NH4)2CO3 to removing S<2->, SiO2, As and P for decontamination, extracting tungsten and molybdenum with N235 from the purified solution, washing the extract with water, back-extracting with ammonia water, concentrating and crystallizing the back-extracting solution and finally obtaining tungsten and molybdenum mixed oxides by roasting. The method has less pollution, strong adaptability, high tungsten and molybdenum recovery rate, and the tungsten recovery rate is more than 90% and the molybdenum recovery rate is more than 95%, thus reducing the production cost and providing a new method for recycling tungsten and molybdenum simultaneously.

The invention provides a dried blood spot quantitative collection device. The dried blood spot quantitative collection device comprises a sample collection tube, sample collection filter paper and a quantitative blood collection tube, wherein the sample collection tube comprises a tube body and a tube cover; the tube body is a straight tube, and the tube cover is used for sealing the tube opening.The quantitative blood collection tube comprises a quantitative capillary tube and a fixing piece; the quantitative capillary tube is fixed on the fixing piece and is provided with a blood sampling end which is used for sampling blood and is exposed out of the fixing piece; the fixing piece is clamped in the tube opening, and the quantitative capillary tube extends into the tube body; the samplecollection filter paper is arranged in the tube body, and the blood sampling end abuts against the sample collection filter paper. The invention further provides a method for collecting the dried blood spots. The integrated blood collecting device design is adopted, sample collection, drying, transportation, storage and extraction can be achieved in the same device, sample pollution is avoided, and the accuracy of a dried blood spot quantitative detection result is improved.

The invention discloses a preparation method and application for aminoglycoside-antibiotic molecularly imprinted polymers. The target molecularly imprinted polymers with the fixed hole sizes and the fixed shapes are made with streptomycin as template molecules, methacrylic acid as functional monomers and ethylene glycol dimethacrylate as cross-linking agents in a thermal initiation polymerization mode, and are used as solid phase extraction column packing. High-selectivity enrichment of aminoglycoside antibiotics can be conducted by a produced solid phase extraction column. The aminoglycoside-antibiotic molecularly imprinted polymers are high in antibiotic extraction recovery rate, and can be used for sample pretreatment of detection of aminoglycoside antibiotics in animal derived food.

The invention belongs to the technical field of sample pretreatment in analytical chemistry, and relates to an efficient method for extracting sulfonamide residues in animal derived food. The efficient method includes synthesizing a sulfonic polystyrene high-molecular polymer, preparing a nanofiber membrane from the sulfonic polystyrene high-molecular polymer through electrostatic spinning, and treating the surface of the nanofiber membrane with plasmas. The high-hydrophilia and high-stability sulfonic functional group nanofiber membrane is prepared, and a sample pretreatment method for effectively enriching sulfonamide type veterinary drug residues without degreasing steps is created. By the sulfo group modified hydrophilia nanofiber membrane, efficient enrichment, extraction and analysis of the sulfonamide type veterinary drug residues of 13 types of labeled samples and market samples in the animal derived food can be realized. By the method, the sulfonamide residues in fat-rich animal derived food base materials can be enriched selectively, utilization of normal hexane is not needed, operation steps are reduced, emulsification is avoided, and accordingly, extraction efficiency is improved remarkably; the method has the advantages of rapidness, simplicity, convenience, high efficiency and high repeatability.

The invention discloses a method for determining the concentrations of two anti-tumor drugs, metabolites and endogenous substances related to the activity of a metabolic enzyme in human plasma, whichcomprises the following steps: preprocessing, respectively taking voriconazole and bromouracil as internal standards, separating drug components in supernate by using high performance liquid chromatography in a preprocessed sample, performing drug targeting detection by using a high-resolution mass spectrum multi-reaction monitoring mode, and quantifying to realize the analysis and determination of the concentrations of the two anti-tumor drugs, the metabolites and the endogenous substances related to the activity of the metabolic enzyme in the plasma. The method has the advantages of rapidness, extremely high targeting property, high flux, high sensitivity, strong specificity, good precision and accuracy, good stability, high extraction recovery rate, no obvious matrix effect and dilutioneffect and the like. The method for determining the concentrations of two anti-tumor drugs, metabolites and endogenous substances related to the activity of the metabolic enzyme in the human plasma can be used for monitoring the blood concentration of irinotecan and metabolites thereof and the blood concentration of fluorouracil and endogenous substances related to the activity of the metabolic enzyme thereof clinically.

The invention discloses a method for measuring ethanolamine substance residual quantity in cosmetics. The method comprises the following steps of detecting a sample which is subjected to liquid-liquid extraction by using high performance liquid chromatography-tandem mass spectrometry instrument (HPLC-MS / MS), adding a formic ethanol solution in the sample, uniformly mixing in a volution manner, carrying out ultrasound extraction and centrifugal separation, taking a supernatant fluid and detecting by using the HPLC-MS / MS. The liquid chromatography conditions are that an amino liquid chromatography pillar is adopted, the column temperature is 30-60 DEG C, sample volume is 10-20mu L and the flowing speed of a flowing phase is 0.15-0.60mL / min; and the MS / MS conditions include an electric atomizing ion source, an cation mode ionization and a multi-ion reaction monitoring mode (MRM). The method provided by the invention has the characteristics that the extraction and purification are rapid, the selectivity of the method is high, the specificity of a chromatogram is strong, the interference is small, and the detection limit is low.

The present invention provides a liquid-liquid extraction device, and a phase splitting commutator and a liquid-liquid extraction method. The device is composed of an extraction container, a phase splitting commutator and a separating container, combined a seal structure. Wherein, the phase splitting commutator only allows liquid flow to separating container in single direction from the extraction container. Using the device for liquid-liquid extraction does not need liquid transfer tool, the operating step is simple, the extraction yield and the precision of the extracted object are higher.

The invention discloses a method for selectively extracting gallium and germanium from peracid lixivium containing gallium and germanium. The method comprises the following steps of: performing liquid-liquid extraction I on the peracid lixivium containing gallium and germanium by an oxime chelate extracting agent, and performing reverse extraction on a loading organic phase obtained from liquid-liquid extraction I by a sodium hydroxide solution to obtain a sodium germanate solution; adding an adjustor to raffinate obtained from liquid-liquid extraction I for adjusting, and performing liquid-liquid extraction II on the adjusted raffinate by phosphate or a phosphate extracting agent; and performing reverse extraction II on a loading organic phase obtained from liquid-liquid extraction II by a sulfuric acid solution to obtain a gallium sulfate solution, or washing the loading organic phase obtained from liquid-liquid extraction II by hydrochloric acid, and then, performing reverse extraction II on the washed organic phase by a sulfuric acid solution to obtain a gallium sulfate solution. The method selectively and efficiently extracts and separates gallium and germanium from the peracid lixivium containing gallium and germanium by the oxime chelate extracting agent and the phosphate or phosphate extracting agent. The extraction recovery rate of germanium is up to 98% and that of gallium is up to 99%. The method disclosed by the invention is simple in process and low in cost, and industrialization is easy to realize.

The invention discloses a method for simultaneously determining blood concentrations of six first-line antituberculosis drugs and antifungal drugs voriconazole in blood plasma, and relates to the technical field of clinical blood concentration monitoring and control. According to the method, an HPLC MS / MS method is adopted, acetaminophen is used as an internal standard, the blood plasma is subjected to protein precipitation through using methyl alcohol, is subjected to elution and separation through HPLC under the specific gradient elution condition according to a specific mobile phase, then enters a mass spectrum system and undergoes multi-reaction monitoring and analysis, therefore, accurate quantification of the blood concentration of seven antibiotics is achieved at the same time. Themethod has the advantages of strong specificity, high sensitivity, good precision and accuracy, good stability, high extraction recovery rate, no obvious matrix effect, simple operation, convenience and rapidness. The method provided by the invention can realize high-throughput determination of clinical samples of tuberculosis patients and guide clinical individualized medication.

The invention discloses a method for quantitatively detecting abiraterone in whole blood. The method adopts whole blood as an object for detecting, and sequentially comprises the following steps: adding ethyl acetate to whole blood lysate, performing vortex shaking, and centrifuging; drying the ethyl acetate layer with nitrogen airflow by means of blowing, redissolving with 20% acetonitrile aqueous solution, centrifuging, and extracting supernatant I; weighing alkaline diatomite and putting into a glass chromatographic column, vibrating, adding the supernatant I, eluting with pure water, 20% methanol aqueous solution and chromatographic methanol sequentially, drying the eluent with nitrogen airflow by means of blowing, redissolving with 20% acetonitrile aqueous solution, centrifuging, extracting supernatant II, and analyzing with a high performance liquid chromatography system to obtain an abiraterone drug peak area Y, putting into equation Y equaling to 27524X plus 1956.6, wherein X is the abiraterone concentration of the supernatant II; and performing conversion to obtain the abiraterone concentration in the whole blood for detecting.

The invention discloses a pretreatment reagent for rapid detection of heavy metal cadmium in grain crops and belongs to the field of heavy metal detection. The pretreatment reagent is formed by mixing ionic liquid, hydrogen peroxide and a citric acid solution, and a method for rapid detection through the pretreatment reagent is further introduced. The implementability and the accuracy of rapid detection of the heavy metal cadmium in grain crops are ensured, the extraction recovery rate of the heavy metal in grain crops can be obviously increased, a possibility is provided for rapid detection and field detection of cadmium in grain crops, grain crops with the cadmium content exceeding the standard are effectively prevented from entering the market to circulate, and a guarantee is provided for people eating the healthy grain crops.

The invention provides a method for simultaneously a detecting concentration of aromatase inhibitor, a type 5 phosphodiesterase inhibitor and the metabolites of the aromatase inhibitor and the type 5 phosphodiesterase inhibitor in human plasma. The method comprises the following steps of: adding a protein precipitant into a human plasma sample to precipitate protein in the human plasma sample; measuring the obtained sample solution by high performance liquid chromatography-mass spectrometry; determining the aromatase inhibitor, the 5 type phosphodiesterase inhibitor and the metabolites thereof in the sample solution according to retention time; and performing quantifying by adopting an internal standard curve method so as to determine the concentrations of the aromatase inhibitor, the 5 type phosphodiesterase inhibitor and the metabolites thereof in the sample solution. The method not only is simple and rapid and accurate in quantification, but also has the advantages of high sensitivity, high selectivity, good repeatability, high recovery rate and the like, and meets the clinical large-batch biological sample analysis requirements of simple operation, reliable data and controllable conditions.

The present invention disclose a method of preparing high pure cathode copper by using PCB acid chlorine copper etching solution sewage, the main technical characteristics include applying sewage preprocess procedure to satisfy extraction need better, programming multi-extraction to improve extraction recovery rate of cooper, applying extractant with high selectivity avoid extraction entrainment design, washing procedure etc. to reduce carried impurity and dispel affect of chloride ion to electrodeposition. The electrodeposition applies additive to improve copper crystallinity, simultaneity, utilize residual useful ingredient in raffinate to prepare copper etching solution, arriving the objective of both prepare high pure cathode copper effectively and regenerative cycle use of the etchingsolution. The purity of the prepared cathode copper reaches 99.99%.

The invention provides a dilution extraction process capable of improving the copper recovery rate. In a two-stage countercurrent extraction system of a copper-containing solution, raffinate after first-stage extraction is diluted according to an appropriate proportion, then second-stage extraction is performed, an organic phase in the raffinate is recovered by using an oil separation tank, then neutralization is performed by lime, and the up-to-standard emission is further realized. The process has the advantages of simple process flow, good matching property with an existing process, no increase in equipment investment, no increase in production and operation cost, no influence on technical indexes of the extraction process, capability of effectively improving the extraction recovery rate of copper and reducing loss of copper, and the like. The process can also be popularized and applied to a high-acid leaching solution containing copper materials for extracting copper, the copper-containing high-acid leaching solution is used for leaching in a circulating manner, and part of the high-copper and high-acid leaching solution is discharged by opening a path regularly, diluted appropriately and then used for extracting copper, so that the effects of improving the copper leaching rate by high-acid leaching and improving the copper extraction rate by low-acid extraction are achieved, the problems of copper loss, a large amount of gypsum slag, non-smooth copper extraction process and the like caused by a lime neutralization-extraction process of the high-acid leaching solution can be avoided, and the process has relatively good popularization and application prospects.

The invention discloses an HPLC-MS / MS method for simultaneously measuring concentrations of three kinds of aminoglycoside antibiotics in plasma. According to the method, with Dabigatran as an interiorlabel, the protein in plasma is precipitated by using a methanol solution containing formic acid with the volume fraction of0.1%; drug components in the supernatant are separated by using high performance liquid chromatography; and then drug targeting detection is carried out by using a high-resolution mass spectrometry multi-reaction monitoring mode and quantification is performed, thereby realizing simultaneous analysis and measurement of the concentrations of three kinds of aminoglycoside antibiotics in plasma. The method has advantages of high speed, high targeting performance, rapidness,high throughput, high sensitivity, high specificity, high precision and accuracy, high stability, high extraction recovery rate, obvious matrix effect prevention, and dilution effect prevention. Themethod can be applied to the blood concentration monitoring of the conventional aminoglycoside antibiotics clinically, thereby guiding the rational clinical application of aminoglycoside antibiotics.

The invention discloses a quick extraction method for arsenic and selenium in different forms in flying ash. The method comprises the following steps: pretreatment of a flying ash sample; extraction of arsenic and selenium in a non-specific adsorbed state (form 1); extraction of arsenic and selenium in a specific adsorbed state (form 2); extraction of arsenic and selenium in an amorphous and weakly crystallized iron aluminum hydrate oxide combined state (form 3); extraction of arsenic and selenium in a fully crystallized iron aluminum oxide combined state (form 4); and extraction of arsenic and selenium in a residual form (form 5), wherein different forms of arsenic selenium require different ultrasonic extraction time, and the ultrasonic extraction time for arsenic the form 1, the form 2and the form 3 are respectively 11 to 13 min, 23 to 25 min and 2 to 3 min; and the ultrasonic extraction time for selenium in the form 1, the form 2 and the form 3 are respectively 9 to 11 min, 19 to21 min and 27 to 29 min. Compared with a conventional oscillating extraction scheme, the method disclosed by the invention greatly shortens the extraction time, is stable in result and shows high repetitiveness and reproducibility.

The invention discloses a method for producing GlcNAc salts by an enzymic method and purifying the GlcNAc salts, and belongs to the technical field of bioengineering. According to the method, N-acetyl-D-(+)-glucosamine is used as a raw material and is hydrolyzed by deacetylase to obtain GlcNAc and acetic acid; then, the GlcNAc salts are obtained through separation by eluting cation exchange columns by an acid solution; and meanwhile, a byproduct of sodium acetate is obtained through anion exchange recovery. The obtained GlcNAc salts are subjected to concentration, crystallization, decoloring and drying to obtain high-purity GlcNAc salt crystals. According to the method, a cyclic utilization process of enzymes, a cyclic recovery process of residue substrates and a recovery process of aceticacid are combined. The conversion rate of the N-acetyl-D-(+)-glucosamine and the total yield of the GlcNAc salt product are improved, and meanwhile, enzymes are cyclically utilized, so that the residue substrates circulate to be sufficiently converted, and the acetic acid is utilized as resources. Through operation conditions at the normal temperature, the resin loss rate is low; the generation quantity of hydrochloric acid waste liquid is very small; and the economic benefits of energy saving and consumption reduction and the effects of environment protection and safety are realized.