443results about How to "Strong complexing ability" patented technology

The invention discloses a preparation method of polypropylene with high melt strength. The method includes i) a step of, under the action of a Ziegler-Natta catalyst containing a silane type external electron donor, subjecting propylene or propylene with other alpha-olefin to polymerization to obtain a polymer A having a melt mass flow rate of 0.01-0.4 g / min, with a hydrogen concentration being not more than 400 ppmV; ii) a step of adding a 1,3-diether type external electron donor and premixing the 1,3-diether type external electron donor and the polymer A; iii) a step of, under the existence of hydrogen and the premixed materials in the step ii), subjecting the propylene or the propylene with other alpha-olefin to polymerization to obtain a polymer B having a melt mass flow rate of 1.0-60 g / 10min; and a step of preparing polypropylene C with high melt strength comprising the polymer A and the polymer B. The melt mass flow rate of the polypropylene C is 0.8-15 g / 10min. The preparation method is simple and feasible and is convenient to operate and prone to industrial production. High-performance products with high melt strength and wide molecular weight distribution can be prepared by the method. The method has wide application prospect.

The invention relates to the soil improvement technology and the environment protection technology, in particular to a soil heavy metal passivant for the facilities vegetable field and a preparation method thereof for solving the problem that due to solid heavy metal pollution, the sustainable utilization of the facilities vegetable field is influenced. The soil heavy metal passivant for the facilities vegetable field comprises the following components in percentage by weight: 10 to 30 percent of medical stone powder, 10 to 30 percent of diatomite in powder, 10 to 20 percent of zeolite powder, 20 to 30 percent of lignite and 25 to 35 percent of fly ash. The preparation method for the soil heavy metal passivant comprises the following steps: mixing the medical stone powder passing through a 80-mesh screen, the diatomite in powder passing through a 80-mesh screen and the zeolite powder passing through a 80-mesh screen with lignite and uniformly stirring the mixture; and mixing the mixture with the fly ash passing through a 80-mesh screen, sufficiently stirring the mixture and after mixing uniformly, preparing the soil heavy metal passivant. The invention has simple preparation method and achieves the effects of passivating the soil heavy metals in the facilities vegetable filed and reducing the content of heavy metals in the soil which can be utilized by the crops by synergistic effect of the components.

The invention relates to gold potassium citrate for gold plating and a preparation method thereof. The gold potassium citrate is used to substitute for gold potassium cyanide in acidic and neutral gold plating technology. The problem that the product coverage area is too wide when gold citrate is used in the gold plating technology is solved. The technical scheme is that the gold potassium citrate is the mixed crystal of gold potassium cyanide and citric acid potassium salt and the chemical composition of the gold potassium citrate is KAu (CN)2 (K3C6H5O7. k1C6H8O7) k2, wherein KAu (CN)2 is gold potassium cyanide, K3C6H5O7.k1C6H8O7 is citric acid potassium salt which is mixed by potassium citrate K3C6H5O7 and citric acid C6H8O7, k1 is the molar ratio of potassium citrate to citric acid, is more than or equal to zero and is less than or equal to three, and k2 is the molar ratio of citric acid potassium salt to gold potassium cyanide, is more than or equal to one point three and is less than five. The method is mainly suitable for the acidic and neutral gold plating technology.

The invention discloses tin stripping and tin plating liquid, a preparing method of the tin stripping and tin plating liquid and a method for adopting the tin stripping and tin plating liquid for recycling metal tin from tin-containing waste. The tin stripping and tin plating liquid includes various effective components such as organic sulfonic acid tin salt, alkanol group sulfoacid, a stabilizing agent, an accelerating agent, an accelerator, a brightening agent, a grain fining agent, antioxidant and a foaming agent, and all the components are in synergy. The defect of traditionally recycling tin from tin stripping waste liquid is overcome, interference of other metal impurities is avoided, and high-purity metal tin can be efficiently recycled from the waste liquid. In addition, the operation steps for adopting the tin stripping and tin plating liquid for recycling the metal tin from the tin-containing waste are simple and convenient and fast to implement, the high-quality metal tin can be recycled, furthermore, the tin stripping liquid can be regenerated at the same time to be repeatedly utilized, and the problems that traditional tin stripping waste liquid is large in amount, resources are wasted, and the environment is seriously polluted are solved.

The invention provides a heavy metal-contaminated soil remediation agent. The remediation agent is prepared from, by weight, 30%-45% of quick lime, 10%-25% of biomass charcoal, 10%-15% of kieselguhr, 10%-15% of sodium bentonite, 10%-15% of activated aluminum oxide, 5%-10% of nitrilotriacetic acid, 1%-5% of sodium lignin sulfonate and 1%-5% of sodium dodecyl sulfate. A preparation method comprises the steps that the quick lime, the biomass charcoal, the kieselguhr, the sodium bentonite, activated aluminum oxide, nitrilotriacetic acid, sodium lignin sulfonate and sodium dodecyl sulfate are stirred and mixed to be uniform according to the weight ratio, and then the soil remediation agent is prepared. The prepared soil remediation agent has the good effect when cadmium-lead-zinc-mercury compound contaminated soil is remedied.

The invention discloses a purification method for high-purity natural graphite. A method for purifying graphite at high temperature is adopted, and the high-purity graphite is prepared by high temperature reaction, chemical purification, washing and dehydration. An oxidizer and a complexing agent are reacted with the natural graphite, impurities in the raw material are removed, and the graphite with low content of trace element and stable properties is obtained. In the process, the graphite raw material with the carbon content of more than 60 percent is purified, and the graphite with the purity of over 99.9991 percent, ash content of less than 1PPM and the trace elements of less than 0.5PPM is obtained; and the method has the advantages that: the process is simple, and is easy to operate; the production efficiency is high; the power consumption is low; large processing equipment is not needed; and the production cost is saved.

The invention discloses an electrolyte corrosion inhibitor for an aluminum-air cell, an electrolyte and a preparation method, belonging to the technical field of chemical batteries. The electrolyte corrosion inhibitor mainly comprises sodium hyposulfite which has a concentration of 0.005 to 0.2 mol / L in the electrolyte and may further comprise the auxiliary additive sodium stannate which has a concentration of 0.01 to 0.03 mol / L in the electrolyte. The aluminum-air cell provided by the invention has the advantages of simple composition, low cost, safety and accordance with environmental protection requirements, can substantially reduce the hydrogen evolution self-corrosion rate of an aluminum anode, enables the open circuit potential of the aluminum anode and working potential under the condition of impressed current to undergo substantial negative transfer, allows an aluminum anode alloy to have good corrosion resistance and high electrochemical activity and meets the requirement of an alkaline aluminum-air cell for large current density discharging.

The invention relates to a cationic flocculant based on collagen modification and a preparation method thereof. The cationic flocculant is prepared through the following steps of: 1) taking trypsin as hydrolytic agent to hydrolyze industrial gelatine to obtain collagen solution; 2) using glyoxylic acid or gallic acid to modify the obtained collagen solution aiming at increasing the content of carboxyl groups or phenolic hydroxyl groups on collagen molecules to obtain modified collagen solution; and 3) conducting complexation to the obtained modified collagen solution and ferric sulfate or aluminum sulfate according to mass ratio being 1:2 to 1:4 to obtain the cationic flocculant based on the collagen modification. The cationic flocculant can be used for treating waste drilling fluid and solves the problems that the preparation cost of the existing flocculant is high, the synthesized or degraded products are highly toxic and carcinogenic and serious environmental pollution is caused during the current treatment of the waste drilling liquid.

The invention belongs to the technical field of nuclear fuel postprocessing, and discloses a uranium (U) and plutonium (Pu) separation technology in a Purex process. According to the uranium and plutonium separation technology, Pu (IV) in 1BF material flow is reduced to Pu (III) in 1B tank by use of reducing agent 1BX and supplement extractant 1BS to enable plutonium to get into an aqueous phase and uranium to be retained in an organic phase, and uranium and plutonium separation is realized. The reducing agent 1BX which is used comprises 0.1-0.2 mol / L of formaldoxime, 0.35-0.5 mol / L of NO<3-> and 0.35-0.5 mol / L of H<+>; the flow ratio of 1BF:1BX is 1-4, and the flow ratio of 1BF:1BS is 4-6. The uranium and plutonium separation technology has the characteristics that the plutonium recovery rate is high, and the purification coefficients of removal of plutonium from uranium and removal of uranium from plutonium are large.

The invention discloses a compound soil conditioner and a preparation and use method. The compound soil conditioner comprises the following raw materials by mass percent: 40-60% of decomposed organicfertilizer, 10-20% of fulvic acid, 15-20% of edible mushroom dreg or biogas residue, and 15-20% of a compound microbial agent. The raw materials of the compound soil conditioner are rich, the formulais simple, the cost is low, the effect is good, and the compound soil conditioner is suitable for various types of soils and is convenient for large-area agricultural popularization and application. The compound soil conditioner effectively improves the soil and the soil fertility, the content of organic matters in the soil is increased, the microelement is better promoted to be absorbed by a plant root system, the adverse resistance of the plant is improved, the development of the plant root and the action of the beneficial bacteria are promoted, the ecological environment of the soil is improved, the use amount of a fertilizer is reduced, the utilization rate of the fertilizer is increased, and the quality of an agricultural product is improved.

A heavy metal ion adsorbent as well as preparation and application thereof are provided. The invention relates to a composite material graphene-oligomerization tri-aminopropyl triethoxysilane. In addition, the graphene-oligomerization tri-aminopropyl triethoxysilane is used as the heavy metal ion adsorbent. The heavy metal ion adsorbent provided by the invention has excellent property in the aspect of heavy metal wastewater treatment.

The invention relates to the field of preparation methods of polyetheramine, and especially relates to a hyperbranched polythioether polyamine, and a preparation method and a use thereof. The preparation method is simple, raw materials are nontoxic and are easy to obtain, cysteamine hydrochloride can be prepared through hydrolyzing human and animal hair, alkynyl glycidyl ether can be directly purchased, and the method also has the advantages of low requirements of devices involved in the preparation process, no special or strict conditions, and mild reaction conditions. The molecular periphery of the hyperbranched polythioether polyamine has a plurality of primary amino groups, so the hyperbranched polythioether polyamine can be used as an epoxy resin flexible curing agent; and hyperbranched polythioether polyamine hydrochloride which is the precursor of the hyperbranched polythioether polyamine has a strong fluorescence effect, a good antibacterial performance and a good sterilizing performance.

The invention discloses a clean fracturing fluid which comprises crude rubber fluid, viscosity accelerant and gel breaker, the crude rubber fluid comprises the following materials by mass percent: 0.1%-0.5% of hydrophobic association polyacrylamide, 0.05%-0.2% of organic acid, 0.1%-0.8% of clay stabilizer and the balance of water; the viscosity accelerant comprises the following materials according to mass percent: 0.05%-0.4% of alkyl amine oxide, 0.1%-0.5% of Gemini surfactant, 0.1%-1.0% of alkyl lower alcohol, 0.05%-0.4% of pH regulator, and the balance of water; the volume ratio of the crude rubber fluid to the viscosity accelerant is 100:(5-10), and the mass of the gel breaker is 0.005%-0.05% that of the clean fracturing fluid. The invention further provides a preparation method of the clean fracturing fluid. The long-term technical problems of high cost and poor temperature resistance performance of the clean fracturing fluid are solved.

The invention discloses a preparation method of a carbon self-supported metal phosphide catalyst. The preparation method comprises the following steps: dispersing a transition metal element or a transition metal compound in distilled water to form a transition metal dispersion; uniformly mixing the transition metal dispersion with phytic acid, placing the obtained mixture in an oven, drying the mixture to form a colloidal material, and calcining the colloidal material in a microwave oven to obtain a catalyst precursor; and placing the catalyst precursor in a tubular furnace, carrying out calcining reduction in a H2 atmosphere, cooling the obtained material to a passivation temperature, introducing an inert gas containing low-concentration oxygen, and carrying out calcining passivation to obtain the carbon self-supported metal phosphide catalyst. In the present invention, the phytic acid can rapidly absorb microwaves, the transition metal phosphate precursor can be quickly obtained during microwave calcining, the phytic acid is carbonized when absorbing the microwaves and being rapidly heated in order to coat the transition metal phosphate precursor, and carbon wraps the carbon self-supported metal phosphide catalyst which is obtained by the reduction to form a slight carbon film in order to prevent the catalyst from being oxidized.

The invention provides a preparation method of a polycarboxylic acid water reducing agent containing a phosphate group. The preparation method comprises the following steps: firstly, preparing a terminal alkenyl unsaturated phosphonic acid monomer; secondly, mixing acrylic acid, the unsaturated phosphonic acid monomer, a chain transferring agent and de-ionized water to prepare a mixed monomer solution; by taking an alkenyl polyoxyethylene ether macro-monomer solution as a base material, dropwise adding an initiator water solution and the mixed monomer solution respectively under a room-temperature polymerization condition; uniformly stirring, dropwise adding and reacting; and finally neutralizing with a sodium hydroxide solution to obtain the polycarboxylic acid water reducing agent. According to the water reducing agent, the terminal alkenyl unsaturated phosphonic acid monomer is introduced into a structure and primary adsorption is facilitated; the initial dispersity is improved, and hydration and agglomeration of cement are delayed; the slump retaining property is effectively improved and the sensitivity to concrete is reduced; and the stress resistance and adaptability on different aggregate are enhanced.

The invention discloses a thiosemicarbazide compound with the colorimetric identification capability of Hg<2+> and Ag<+>. The compound uses a thiosemicarbazide group as an identification group and nitrobenzophenone as a signal-reporting group and can rapidly and accurately detect mercury ions and silver ions. The identification function of the thiosemicarbazide compound in dimethyl sulfoxide (DMSO) and ten kinds of positive ions are considerate by element synthesis and IR and <1>HNMR confirmation through colorimetric identification and ultraviolet-visible absorption spectrum, the result showsthat the compound can better performs the colorimetric identification on the Hg<2+> and the Ag<+>. Proved by ultraviolet titration experiments, the compound has stronger bonding capability to the Hg<2+> and higher detection sensitivity to the Hg<2+> and achieves a lowest detection limit of 1.6*10<-7> mol*L<-1>. In addition, experiments prove that the compound has selective identification capability to the Hg<2+> and has a certain anti-interference capability to other metal ions.

The invention discloses a concrete brick with high water permeability. The concrete brick is prepared from raw materials in parts by weight as follows: 120-200 parts of cement, 250-300 parts of gravel, 10-35 parts of ardealite, 10-50 parts of slag, 10-50 parts of steel slag, 200-350 parts of river sand, 20-50 parts of fly ash, 5-20 parts of silica fume, 10-35 parts of sintered magnesia, 2-15 parts of metakaolin, 10-40 parts of mixed fiber, 5-38 parts of straw powder, 3-8 parts of a water reducer, 0.1-0.5 parts of ethylene diamine tetra (methylene phosphonic acid) sodium and 20-50 parts of water. The concrete brick with high water permeability has very high compressive strength and excellent water permeability and can meet the use requirement of multiple fields.

A preparation method of an EDTA modified magnetic adsorbent includes the steps of adding Fe3O4@SiO2 particles to methyl alcohol, conducting ultrasonic dispersing for 20-30 min, adding N-[(3-trimethoxysilyl)propyl]ethylenediamine triacetic acid trisodium salt, then adding glacial acetic acid, and conducting ultrasonic dispersing, washing and drying to obtain the EDTA modified magnetic adsorbent. By controlling the ratio of the magnetic Fe3O4@SiO2 particles to EDTA, the EDTA is polymerized on the Fe3O4@SiO2 particles, and the novel EDTA modified magnetic adsorbent is synthesized; the characteristic of Fe3O4@SiO2 magnetic separation is used, the adsorbent has the capacity of the EDTA for complexing and adsorbing trivalent chromium, and is an adsorbent good in application prospect, and the adsorbent is short in synthesis cycle, low in cost, simple in method and good in economic benefit.

The invention discloses a separating membrane for filtering heavy metal ions, wherein the separating membrane is composed of a non-woven cloth layer, a porous support layer and an algin layer on the surface of the porous support layer; the non-woven cloth layer is coated with the porous support layer, the porous support layer is a membrane layer formed by mixing cellulose acetate, a pore-foaming agent and a solvent. The separating membrane prepared by the method has a favorable interception performance to heavy metal ions (such as Cd(II), Cu (II) and Fe (III)) in a water solution, and can be applied to waste water treatment in the chemical engineering industry.

The invention discloses a regenerated liquid of a vanadium and titanium-based selective catalytic reduction (SCR) denitration catalyst. The regenerated liquid comprises a cleaning liquid and an active replenishing liquid, wherein the cleaning liquid consists of alkaline organic salt, a surfactant and deionized water; the active replenishing liquid consists of weak acid, ammonium metavanadate, ammonium tungstate, cerous nitrate and deionized water. The cleaning liquid ingredient in the denitration catalyst regenerated liquid provided by the invention can eliminate adverse effects of harmful substances to the SCR denitration catalyst, and recover the pore pathway structure; the active replenishing liquid ingredient can improve the activity of the denitration catalyst, increase the thermal stability of the catalyst, and prolong the service life of the catalyst; the denitration ratio of the regenerated catalyst can reach 82%-90%; the SO2 / SO3 conversion rate is less than 1%; the service life of the regenerated liquid is mo than 85% of that of a fresh catalyst.

The invention discloses a high-voltage electrolyte containing cyclopentene dinitrile and a lithium-ion battery employing the electrolyte. The high-voltage electrolyte is characterized by comprising an electrolyte lithium salt, a non-aqueous organic solvent and an additive, wherein the additive comprises fluoroethylene carbonate and a cyclopentene dinitrile compound; a nitrile functional group -CN in the cyclopentene dinitrile compound and transition metal ions in a positive active material can generate complexation; catalytic decomposition of the electrolyte is reduced; dissolution of the metal ions is inhibited; and the crystal structure of the high-voltage positive active material is stabilized, so that the cycle performance and the high-temperature performance of the high-voltage battery are improved.

The invention provides a Cu<2+> chemical sensor, and a preparation method and application thereof. Based on an MOF nanomaterial, the invention combines with a Cu<2+> fluorescent probe to further prepare a Cu<2+> chemical sensor. The MOF nanomaterial ZIF-8 not only has specific adsorption capacity on Cu<2+>, but also has high porosity, high specific surface area, transition metal as center, chemical stability, regular structure, and diversified frame structure. A novel Cu<2+> sensor and fluorescent probe show good linear relationship with Cu<2+> ions, and the detection limit is 8.3*10<-9>mol / L and 5.2*10<-8>mol / L. The novel Cu<2+> sensor obtained by the present invention has a lower detection limit based on the original probe, and can be used for quantitative detection of Cu<2+> concentration the water.

The invention provides a total nutrient rice seedling culture substrate, belonging to plant seedling culture substrates in the field of agriculture, and in particular relates to a total nutrient rice seedling culture substrate which takes turf as a main ingredient. The total nutrient rice seedling culture substrate contains 70%-87% of turf, 10%-27% of a fertilizer and 3%-15% of an agricultural water-retaining agent by weight percentage, wherein the fertilizer contains 20-40 parts of a nitrogen fertilizer, 15-25 parts of a phosphate fertilizer, 10-15 parts of a potash fertilizer, 8-12 parts of hypha protein powder, 6-10 parts of fulvic acid and 5-10 parts of fly ash in parts by weight. The total nutrient rice seedling culture substrate provided by the invention has the advantages of warming, ventilating, retaining the fertilizers and water, being nutritionally balanced, small in volume weight, easy and convenient to operate, easy to manage, good in seedling quality and low in seedling culture cost, labor and effort conservation, and the like.

The invention provides a process for electrolyzing and refining lead, zinc and copper through a wet method. The process includes the specific steps that an alkalescent complexing solution with high complexing capacity is selected as a leaching solution and all valuable metals are leached out; impurities of the leaching solution are removed through a metal replacement mode; deposited lead or deposited zinc or deposited copper and oxygen are obtained through an electrolytic method; then the solution is subjected to desulfuration and desilicication through calcium oxide or calcium hydroxide; and finally, the lead or the zinc or the copper is obtained after being refined. The alkalescent complexing solution is adopted for leaching and electrolyzing, so that the problems that the leaching rate is low and metal silicates and ferrates are hard to dissolve in terms of current metal smelting with the wet method are solved. Compounds of calcium or barium are adopted for desulfuration of metal sulfates, so that the problem of high desulfuration cost caused by current desulfuration through sodium carbonate or sodium hydroxide is solved. The potential of hydrogen (pH) value of the alkalescent complexing solution is controlled to be 7.5-13.5, the electrolytic voltage is substantially lowered, and the energy consumption is effectively reduced.

The invention discloses a hydrogel material for treating heavy metal containing sewage. The hydrogel material is mainly prepared from, by weight, 30-50 parts of methacrylic acid, 20-30 parts of polyethylene glycol, 10-15 parts of sepiolite, 5.0-7.0 parts of polyvinyl alcohol, 3.0-5.0 parts of humic acid, 0.4-0.6 part of ammonium persulfate, 0.05-0.10 part of aluminum sulfate and 0.05-0.10 part of N,N'-methylene bisacrylamide. The reinforcing function of humic acid and sepiolite is utilized, humic acid and sepiolite are evenly inserted into a three-dimensional network hydrogel material formed by methacrylic acid, polyethylene glycol and polyvinyl alcohol, and the hydrogel material with good adsorption efficiency on heavy metal ions, the large adsorption amount, a stable structure and excellent mechanical performance is formed. Production cost is reduced, meanwhile, the thermal decomposition temperature of the material is raised, the service life of the material is prolonged, and the hydrogel material is suitable for the sewage treatment technology. The invention further discloses a preparation method of the hydrogel material for treating the heavy metal containing sewage. The production process is simple, cost is low, safety and environment friendliness are achieved, and market application prospects are achieved.

The invention relates to a method for preparing feed protein power and a fermented nutrition improver through comprehensive utilization of corn steep liquor. The method comprises the following steps: by taking the corn steep liquor as a raw material, performing phytase hydrolysis pretreatment, micro-filtration and ultrafiltration, thereby obtaining concentrated solution which takes a macromolecular protein as a main component; concentrating and drying, thereby obtaining the feed protein powder which serves as a feed protein raw material, wherein the clear liquor obtained by ultrafiltration takes small molecule peptides and amino acids as main components, is rich in biotin, vitamin B1, nutritive salt and other nutrient substances needed by microbes. Performing nanofiltration concentration on the clear liquor, separating to remove the sulphurous acid, lactic acid and one part of salt, and further concentrating, thereby obtaining the fermented nutrition improver, which serves as an upgraded product of the corn steep liquor or replaces the yeast extract to be used for the fermentation industry. According to the method disclosed by the invention, the modern separation technology is utilized, the corn starch byproduct, namely the corn steep liquor, is processed into the feed protein powder and fermented nutrition improver with high additional value, and comprehensive utilization of resources is improved.

The invention discloses a tooth powder which is characterized by comprising anti-staining active ingredient, acid-free desensitization ingredient, odour removal ingredient and base stock ingredient, wherein the anti-staining active ingredient comprises modified phytic acid sodium and urea hydrogen peroxide; the acid-free desensitization ingredient comprises sodium monofluorophosphate and Chinese medicine desensitization agent; the odour removal ingredient comprises angelica root extract and liex rotunda extract; and the base stock ingredient comprises dicalcium phosphate dehydrate, calcium carbonate, silica, soluble saccharin, glycerol, essence, sodium lauryl sulfate and the balance of preservative. When being in fabrication, the tooth powder not only has the functions of cleaning dental plaque, complexing and dissolving pigmentation of tooth surface but also can reduce the irritation to the oral cavity and the aching, limp and allergic feeding can not be caused during use process through a combination technology.

A method for detecting a divalent cadmium ion in an aquatic product by using an HPLC-ICP-MS (High Performance Liquid Chromatography-Inductively Coupled Plasma-Mass Spectrometer) coupling technique belongs to the technical field of detection of aquatic products. The method comprises the following steps: 1), selecting instruments and equipment as well as an HPLC-ICP-MS coupling system; 2), configuring reagents and a standard solution; 3), processing a sample; 4), creating conditions for the experiment instruments; and 5), detecting the sample and calculating the results. According to the method, the cadmium in the aquatic product is extracted by neutral water in an ultrasonic way and the state of the cadmium is not changed, so that the cadmium in a free ion state and the cadmium subjected to complexation with organic matters such as protein both exist in the extract solution. In the adopted mobile phase, oxalate exerts a strong complexation effect on the cadmium ions but does not adsorb and elute stable cadmium complex in the extract solution, so that the cadmium ions and the cadmium complex in the sample can be guaranteed to be better separated. The method for detecting the divalent cadmium ion in the aquatic product by using the HPLC-ICP-MS coupling technique fills a blank in national standard that only the cadmium detection method is provided but no method for detecting the state of cadmium element is provided, therefore, the quality safety of the aquatic product and products of the aquatic product can be accurately and scientifically evaluated, meanwhile, the method is of great significance for formulating a new standard on the limit of harmful elements in the aquatic product.

The invention discloses a pre-embedded bag for multi-stage remediation of uranium-contaminated soil and a use method thereof, and belongs to the technical field of uranium-contaminated soil remediation. The pre-embedded bag for multi-stage remediation of uranium-contaminated soil can be pre-embedded by a soil cleaning and per-embedding manner, on the one hand, uranyl ions in the soil are transferred through a strict water-conducting network, a large amount of uranyl ions are actively and quickly collected into the pre-embedded bag to facilitate fixed-point remediation, on the other hand, a special soil remediation agent is used to greatly improve adsorption and accumulation for uranyl ions, agglomeration of uranyl ions is improved based on nano porous properties, and uranyl ions are filledin micro-pores to avoid contamination and diffusion. After the active primary remediation, uranyl ions in the uranium-contaminated soil are reduced to a certain value, then natural secondary remediation, namely heavy metal uranium enrichment plant remediation, is followed, the soil organic matter content and soil fertility are increased, a soil surface structure is improved and maintained, and asolid foundation for direct use of the soil after uranium pollution remediation is laid.

The invention provides a benzimidazole quinoline derivative, a preparation method and application in copper ion detection, and particularly relates to a 2-(4-N,N-bis-substituted styryl)-8-1H-benzimidazole) quinoline derivative. Particularly, 2-aminobenzoic acid is used for preparing 2-methylquinoline-8-carboxylic acid, then the 2-methylquinoline-8-carboxylic acid and o-phenylenediamine are subjected to condensation to obtain 2-methyl-8-(2-benzimidazolyl) quinoline, the 2-methyl-8-(2-benzimidazolyl) quinoline and N,N-bis-substituted benzaldehyde are subjected to condensation to obtain the benzimidazole quinoline derivative. A probe has the good complexation with copper ions, when the copper ions exist, derivation of the solution is observed with naked eyes, and the solution is changed from yellow to purple, absorption at the 418 nm position on an ultraviolet visible absorption spectrum is weakened, and a novel absorption peak appears at the 550 nm and gradually increases when the concentration of the copper ions is increased; the benzimidazole quinoline derivative can be used for real-time and rapid measurement of complex samples and can also be used for semiquantitative detection of micro / trace Cu2+ of environment samples from different sources.