253results about How to "High enrichment factor" patented technology

The invention discloses a solid phase microextraction coating of a hydroxyl cucurbituril as well as a preparation method and an application thereof, relates to an analyzing sample pre-treatment technology, and belongs to the technical field of analytical chemistry. The solid phase microextraction coating is characterized in that a common pentabasic cucurbituril or six-membered cucurbituril is subjected to potassium peroxodisulfate oxidation and cation exchange resin separation and purification so as to obtain the hydroxyl cucurbituril through, the hydroxyl cucurbituril is bonded on a sol-gel mesh through a chemical reaction so as to obtain the solid phase microextraction coating, the coating is utilized to prepare a solid phase microextraction fibre which is combined with a gas chromatography, the environmental water sample containing polycyclic aromatic hydrocarbon is analysed, and the coating is utilized to prepare a solid phase microextraction stirring rod which is combined with a high performance liquid chromatography so as to analyze non-steroid antiinflammatory drugs. The solid phase microextraction coating provided by the invention has the advantages that the superficial area of the coating is large, and the extraction capacity is large; and the solid phase microextraction coating is a novel solid phase microextraction coating, is used for analyzing, high in selectivity, low in detection limitation, wide in linearity range, and good in selectivity.

The invention discloses a method for simultaneously detecting six types of 24 antibiotics in livestock excrements by combination of ultrasonic extraction-solid phase extraction pretreatment and a liquid chromatography-mass spectrometry technology. The method comprises the following steps: (1) adding an internal standard substance for indicating the recycling rate in advance, and performing ultrasonic extraction; (2) performing solid phase extraction to enrich and purify target antibiotics; (3) performing the liquid chromatography-mass spectrometry technology to detect the contents of the 24 antibiotics. According to the method, the residue conditions of the six types of 24 antibiotics in the livestock excrements can be simultaneously detected at one time; the time of the detection processis short, the detection precision is high, the sensitivity, the stability and the selectivity are high, and the detection limit is low; by optimization of an extraction solvent, chelation between theantibiotics and metal ions in the excrements can be effectively reduced, so that the target antibiotics are separated from a sample, and the recycling rate is increased; furthermore, the method is easy and convenient to operate, high in enrichment factor and high in repetitiveness. The internal standard substance for indicating the recycling rate is added before the whole pretreatment process, sothat the loss of target substances in the pretreatment process can be well expressed, and a final result is more real and reliable.

The invention discloses a chitosan-grafted beta-cyclodextrin bonded silica gel absorbent as well as a preparation method and application of the chitosan-grafted beta-cyclodextrin bonded silica gel absorbent, and belongs to the technical field of the absorbent material preparation. The preparation method of the chitosan-grafted beta-cyclodextrin bonded silica gel absorbent comprises the steps of (1) activating silica gel, (2) bonding the silica gel with gamma-aminopropyl, (3) carrying out silica gel formyl group modification reaction, and (4) bonding chitosan with glutaraldehyde and grafting beta-cyclodextrin with the chitosan. According to the chitosan-grafted beta-cyclodextrin bonded silica gel absorbent provided by the invention, the activated silica gel surface is chemically modified by gamma aminopropyl triethoxy silane, and then, cyclodextrin-grafted chitosan is taken as a functional monomer to compound a solid-phase extraction material. By combining cyclodextrin recognition performance and a chitosan absorbing function, the chitosan-grafted beta-cyclodextrin bonded silica gel absorbent has the advantages of firmness in bonding, stable property, favorable reproducibility and selection, and large enrichment multiple, and the chitosan-grafted beta-cyclodextrin bonded silica gel absorbent can be used in a wide pH scope. The absorbent can be used in the enrichment pretreatment of trace Cu (I) and Cd (II) in an environmental water sample.

The invention discloses a hyperbranched polyamide-grafted chitosan adsorbent and its preparation method and use and belongs to the field of adsorption material preparation. The preparation method comprises 1, amino-terminated hyperbranched polymer synthesis and 2, amino-terminated hyperbranched polyamide-modified chitosan synthesis. Under cross-linking action of glutaraldehyde as a cross-linking agent, amino-terminated hyperbranched polyamide is carried by chitosan as a carrier so that the solid phase extraction material is obtained. Through introduction of a lot of nitrogen-containing groups to chitosan, active group content is improved, adsorbent adsorption performances are improved, bonding strength is improved, properties are stable, reappearance is good and enrichment multiple is large. The hyperbranched polyamide-grafted chitosan adsorbent can be used for adsorption of heavy metal copper ions and dye in an environment sample.

The invention discloses a method for recovering noble metals from a spent auto-catalyst. The method comprises the following steps: (1) early treatment of materials; (2) burdening, and mixing, namely mixing the materials processed in the step (1) according to the ratio, wherein the materials comprise 75-85 parts of spent auto-catalyst taking cordierite as a carrier, 2-4 parts of magnetite, 1-3 parts of metallurgical coke, 10-13 parts of lime and 1-3 parts of fluorite mine; (3) processing the obtained materials by adopting a plasma furnace: a, introducing argon of which the purity is 99.99% into the plasma furnace, so as to keep micro negative pressure inside the furnace; b, beginning to feed the materials obtained in the step (2) to the plasma furnace when the temperature inside the plasma furnace is within the range of 1500-1600 DEG C; c, beginning to discharge slag from a slag phase discharge hole after smelting for 3-6 hours, d, carrying out heat preservation at 1600-1650 DEG C for 30 minutes after charging the materials obtained in the step (2), and then opening the metal phase discharge hole, so as to obtain alloy containing noble metals. By adopting the method, the total yield of platinum, palladium and rhodium is greater than 98%, the recovery rate of platinum is greater than 98%, the recovery rate of palladium is greater than 98%, and the recovery rate of rhodium is greater than 97%.

The invention relates to a technology for purifying scandium, titanium and vanadium from an acid solution step by step. According to the technology, the acid solution obtained by leaching red mud through sulfuric acid is subjected to three-time extraction work, and an extraction organic phase is composed of a P507 extraction agent, a TBP synergist and sulfonated kerosene; in the first-time extraction process, the acid solution is directly subjected to scandium extraction and enrichment without pH value adjustment, after two-phase separation, a scandium-enriched organic phase and a titanium and vanadium containing solution are obtained, the scandium-enriched organic phase is subjected to sulfuric acid scrubbing and reverse extraction of sodium hydroxide, and scandium-enriched liquid is obtained; after the titanium and vanadium containing solution is subjected to pH value adjustment, the second-time extraction work is conducted for enrichment and separation of titanium, after two-phase separation, a titanium-enriched organic phase and a vanadium-containing solution are obtained, and after the titanium-enriched organic phase is subjected to sulfuric acid scrubbing and reverse extraction of hydrofluoric acid, titanium-enriched liquid and the vanadium-containing solution are obtained; and after the vanadium-containing solution is subjected to pH value adjustment and reducing treatment, the third-time extraction is conducted, and after two-phase separation, a vanadium-enriched organic phase and raffinate are obtained. The technology has the beneficial effects that the separation efficiency is high, the enrichment multiple is large, the technology is simple, and the number of the kinds of extraction agents is small.

The invention provides, inter alia, methods of extracting an analyte from a solution comprising the steps of: passing a solution containing an analyte through an extraction channel having a solid phase extraction surface, whereby analyte adsorbs to the extraction surface of said extraction channel; purging bulk liquid from said extraction channel; and eluting the analyte by passing a desorption solvent through the channel. In some embodiments, the analyte is a protein. The invention further provides reagents, channels, columns and instrumentation related to this and other methods.

The invention provides an aqueous two-phase extraction system formed by anion/cation mixed surfactant which is induced by fluoroalcohol, a preparation method and an application thereof. The aqueous two-phase extraction system comprises anion surfactant sodium dodecyl sulfate, cation surfactant hexadecyl trimethyl ammonium bromide, hexafluoroisopropanol and water. The extraction system has short phase forming time, wide phase forming range, gentle and simple phase forming condition, low consumption and high efficiency, so the extraction system is a novel extraction system. The invention can extract and separate different types of compounds through the phase forming conditions of the system, so the application prospect is good.

The invention relates to a method for recycling sulphur from a sulphur-containing residue. The method comprises the following steps: mixing the sulphur-containing residue and an organic solvent in a proportion; heating, preserving heat, and stirring to melt the sulphur; keeping the temperature of a mixture and filtering; drying a filtered residue, and recycling the organic solvent; settling and layering a filtrate; returning the organic solvent on the upper layer into a system for reuse; cooling liquid sulphur on the lower layer to obtain finished sulphur. The method disclosed by the invention is simple in equipment, low in investment and energy consumption, high in sulphur recycling rate and low in residue amount; the sulphur content in the residue is low; the valuable metal enrichment factor is large; continuous production is convenient to realize.

The present invention relates to the ore prospecting of blind uranium ore deposit and is one foamed plastic carried extraction and exploration method. Foamed high density polyurethane plastic carrying PMBP or N263 with very high adsorption to uranium (VI) is used as extracting material in adsorption extracting exploration or constant-voltage adsorption extracting exploration. The said method can find uranium ore deposit buried deep under to 400 m depth, and the present invention solves the difficult problem of finding blind uranium ore deposit. The present invnetion includes the preparation of foamed plastic carrying PMBP or N263 and field extraction job. The present invention has the features of great information amount, high abnormal peak, great enrichment coefficient and good ore finding effect.

The invention relates to a method for separating/gathering trace ciprofloxacin in food, belonging to the field of environment analysis technologies. The method is a novel separation technology in which thermo-sensitive polymer EOPO (ethylene oxide and propylene oxide copolymer) and salt are mixed, the property that the affinity of a surface active agent and water is changed under a temperature change condition is utilized, and an aqueous two-phase system is formed with the combination of inorganic salt to perform extraction separation. The novel separation system has the advantage of aqueous two-phase extraction, and can realize secondary extraction due to the temperature separation property of the thermo-sensitive polymer, so that the extraction efficiency is higher than that of one-time extraction, and besides, the recovery of phase components enables the experiment cost to be reduced.

The invention discloses an aminoglycosides molecular molecularly imprinted solid-phase extraction column. Molecularly imprinted polymeric microspheres are filled in a columnar shell, and a preparation method for the molecularly imprinted polymeric microspheres comprises the steps of: taking 3-aminopropyltriethoxysilane or phenyltriethoxysilane as functional monomers, taking tetraethyl orthosilicate as a cross-linking agent and taking aminoglycoside antibiotics as template molecules, performing hydrolytic condensation by adopting a sol-gel method, forming a rigid network structure of an Si-O-Si bond on the surface of activated silica gel to form the polymeric microspheres; and eluting.by using template molecules, so as to obtain the molecularly imprinted polymeric microspheres. The extraction column is used for separating and concentrating target objects before sample pretreatment is performed on residue of veterinary drugs of the aminoglycoside antibiotics, and selectively adsorbing the target objects, and has the advantages of being simple and fast in separation, purification and concentration, little in organic solvent consumption and high in repeatedly used times, and the like.

The invention provides an energy plant remediation method for heavy metal contaminated soil and a modifying agent for the energy plant remediation method. Improved soil is planted with energy plants, and thus, heavy metal in the soil can be absorbed; the modifying agent which comprises, by mass, 80-95% of a bio-organic fertilizer, 3-15% of peat soil and 2-5% of a pH regulator is adopted to control and adjust the soil fertility and the pH value, so that a more favorable growing environment is provided for the plants, the biomass and the enrichment effect of the plants for absorbing the heavy metal are remarkably improved, and accordingly, the plants are promoted to absorb the heavy metal; and in addition, large-scale digestion and save of crop straw and livestock excrement can be achieved, and the method and the modifying agent have prominent economic benefits and environmental benefits.