52 results about "Methylmercury" patented technology

The invention discloses compound biochar-based slow-release fertilizer and an application method thereof and mainly relates to the field of biochar-based fertilizer. A preparation method of the compound bio-carbon-based slow-release fertilizer comprises mixing agricultural rice straws and wood shavings, preparing char, adding sodium selenite into the char to obtain biochar, mixing pig manure and chicken manure, carrying out fermentation on the pig manure and chicken manure, carrying out metal passivation treatment to obtain manure-based fertilizer, further fermenting the biochar and the manure-based fertilizer, and adding diatomite into the fermentation product for modification to obtain slow release fertilizer granules. In use, preferably, the slow-release fertilizer granules are applied to the field according to a ratio of 256 kg per mu, and a field moisture capacity measured value is kept in a range of 70% to 80% in the whole growth period. The compound biochar-based slow-release fertilizer can meet the demand of nitrogen and phosphorus in the early stage and the whole period of rice seedling, has sufficient and lasting fertilizer effects, prevents the effects of heavy metals, improves the soil environment, inhibits methylmercury, and can produce high-yield good-quality selenium-rich rice.

The invention discloses a method for measuring methyl mercury and ethyl mercury in animal flesh. The method is characterized by comprising the following steps of: pretreating an animal flesh sample; performing microwave-assisted extraction; analyzing through a liquid chromatography-atomic fluorescence combined instrument; and finally, collecting and processing the data by using a data processor, and measuring the content of methyl mercury and ethyl mercury in fish flesh. The microwave-assisted extraction and high performance liquid chromatography-atomic fluorescence spectroscopy (HPLC-AFS) method are simultaneously applied to detecting the methyl mercury and ethyl mercury in animal flesh, and an extraction process is optimized; according to selection and concentration control of mobile phase in chromatographic analysis and reasonable control on concentration of hydrochloric acid in atomic fluorescence analysis, selection of reducing agents and lamp current, the process flow is simplified, the content of methyl mercury and ethyl mercury in the animal flesh can be rapidly and simply measured, and the detection method is simple and fast in measurement and high in stability and has the characteristics of high measurement sensitivity, high accuracy and high interference resistance.

A preparation method of a novel sulfhydrylization graphene oxide and iron and manganese oxide composite material is simple and convenient. The method comprises the steps that a ferrous sulfate solution and a potassium permanganate solution are added into a graphene oxide suspension in sequence, mixing is conducted to be uniform, the pH is adjusted to be 7.5, stirring and standing are conducted, water washing is conducted till the mixture is neutral, and after freeze drying is conducted, graphene oxide and iron and manganese oxide composite material powder is obtained; the powder is cleaned with ethyl alcohol, ultrasonic dispersion is conducted for 1 h in methylbenzene, after cleaning is conducted with ethyl alcohol, the treated powder is dispersed in a 2% 3-mercaptopropyltrimethoxysilane (95% ethyl alcohol) solution, stirring is conducted for 6 h, the pH is adjusted to be 9.5 with ammonia water, stirring is conducted for 24 h, water washing and freeze drying are conducted, and sulfhydrylization graphene oxide and iron and manganese oxide composite material powder is obtained. Graphene oxide is combined with iron and manganese oxides, agglomeration of the iron and manganese oxides is blocked, and the removal effect of methylmercury in water is significantly improved by means of introduction of a sulfhydryl group. The preparation method of the novel sulfhydrylization graphene oxide and iron and manganese oxide composite material has the advantages of being simple in process, stable in effect, wide in application range, environmentally friendly, high in selectivity and the like.

The invention relates to a method of determining a residual quantity of methylmercury in aquatic products. The method comprises mixedly extracting samples by a given volume of hydrochloric acid of a certain concentration and a sodium chloride solution, extracting with toluene, stripping with an L-cysteine ??solution, deriving with a given volume of derivative agents of two concentrations, pre-treating with n-hexane extraction, measuring the methylmercury by using a gas chromatography-mass spectrometry, wherein a temperature of an introduction port of the gas chromatography is set to be 250-300 DEG C, a carrying gas is set as a constant voltage mode, a nonpolar chromatographic column is selected and an interface temperature is 260-300 DEG C, passing the pre-treated sample through the gas chromatography and then into the chromatographic column, then heating, separating the sample in the chromatographic column, then entering into the mass spectrometry, determining nature of the sample according to a retention time of object compounds, characteristic ions and an abundance ratio, and determining an amount of the sample by an external-standard peak-area method. The method provided by the invention has advantages of accurate analysis method, good selectivity, high sensitivity and small interference.

The invention discloses a methylmercury ion imprinted magnetic microsphere, and a preparation method and application thereof. The methylmercury ion imprinted magnetic microsphere is an ion imprinted polymer prepared by synthesizing methylmercury ion physical structure three-dimensional holes in the surface of a ferroferric oxide magnetic microsphere. According to the characteristics that the ion imprinted polymer with the methylmercury ion structure three-dimensional holes has high specific adsorption capacity to methylmercury ions, and ferroferric oxide magnetic microspheres can be quickly collected and separated through magnet, specific, rapid and high-expansion preconcentration and separation of ultra-trace methylmercury in water can be realized.

The invention belongs to the field of heavy metal detection, and relates to a measuring method of methyl mercury and ethyl mercury. According to the measuring method, chitosan is taken as a raw material to prepare aminothiourea modified magnetic chitosan (AT-MCS), MSPE is adopted, aminothiourea modified magnetic chitosan (AT-MCS) is taken as a solid phase extracting material, high performance liquid chromatography and atomic fluorescen spectrometry method are combined and adopted to measure methyl mercury and ethyl mercury in environmental water samples, and a morphological analysis method of methyl mercury and ethyl mercury in environmental water samples is established. Operation of the measuring method is simple and convenient; analysis time is shortened greatly; analysis cost is reduced greatly; average recovery rate ranges from 83.4 to 106.0%; the relative standard deviation ranges from 1.61 to 9.83%; extraction effect is excellent; analysis results are accurate; reproducibility is high; the raw materials are cheap and easily available; material preparation process is simple; reaction conditions are mild; and the measuring method is friendly to the environment.

The invention discloses a thermal desorption and sampling device for methyl mercury. The thermal desorption and sampling device comprises a flow meter and a thermal desorption device, wherein the thermal desorption device comprises a heating coil, a heating power supply, a heating switch and a heating power supply and voltage regulator; when an experiment for determining the content of the methyl mercury is carried out, an argon bottle is firstly opened; argon enters the lower end of the flow meter through a PFA gas pipeline, then flows out from the upper end of the flow meter, and enters a methyl mercury-enriched Tenax adsorption pipe through the PFA gas pipeline; and the heating coil sleeves the adsorption pipe. According to the thermal desorption and sampling device, carrier gas flow control and heating desorption devices are integrated; the thermal desorption and sampling device is simple in structure and convenient to operate; thermal desorption and sampling operation on the methyl mercury are greatly simplified; experiment efficiency is improved; and compared with devices with the similar functions, the thermal desorption and sampling device is extremely low in construction cost.

The invention discloses an ionic imprinting material for enriching ultratrace methyl mercury in a water body and a preparation method and application of the ionic imprinting material. A silicon dioxide microsphere serving as a carrier, methyl mercury chloride and pyrrolidinecarbodith which serve as templates, methacrylic acid serving as a functional monomer, TMPTMA serving as a crosslinking agent and azodiisobutyronitrile serving as an initiator are synthesized to form a silicon dioxide microsphere, on the surface of which a three-dimensional cavity ionic imprinting polymer with a methyl mercury ion structure is arranged. The ionic imprinting material has the advantages of short enrichment time, simplicity in operation, high specificity, high enrichment capacity, low cost and the like and can be used for quickly pre-enriching and separating ultratrace methyl mercury ions in various water samples.

The invention discloses a method for determining a content of methylmercury in fish oil, which comprises extracting a sample, performing chromatographic analysis, performing atomic fluorescence analysis, performing data acquisition on intensities of fluorescence emitted from mercury atoms by data processing software, and listing the collected data to conveniently and accurately detect the content of methylmercury in the fish oil. The invention has advantages that it simultaneously employs the chromatographic analysis and atomic fluorescence analysis, and carries out selection of a mobile phase, and control of the concentration and flow rate of the mobile phase in the chromatographic analysis, and selection of a reductant and an oxidant and control of the lamp current and carrier gas in the atomic fluorescence analysis, thus the content of methylmercury in the fish oil is determined rapidly and conveniently. In addition, the method has low reagent consumption, short analysis period, good stability and high accuracy, and is very practical.

The invention discloses a DGT fixing membrane for methylmercury and metal mercury ions in sediment, and a preparation method thereof, a DGT apparatus and an eluent, wherein the fixing membrane is formed by carrying out film forming and gelation on the mixed liquid of polyacrylamide, zirconium hydroxide hydrate and an isothiourea functionalized macroporous cross-linked polystyrene resin. Accordingto the present invention, with the fixing membrane, the mercury metal in the wetland soil sediment can be efficiently and quickly adsorbed and eluted so as to determine the mercury content.

The invention discloses a method for testing the methyl mercury and the ethyl mercury in the aquatic feed. The method comprises the following steps of: using simultaneous distillation extraction method to simultaneously collect and extract samples, and water back extract; then performing a derivative reaction by using the sodium(tetra-n-propyl)borate as a derivatization reagent; finally, testing the methyl mercury and the ethyl mercury in the aquatic feed by using a full automatic alkyl mercury tester. According to the method for testing the methyl mercury and the ethyl mercury in the aquaticfeed, the method detection limit of the methyl mercury is 2mu/kg, the quantification limit is 6mu/kg, the relative standard deviation is 4.58%, and the average spike recovery is between 90.6% and 97.3%; the method detection limit of ethyl mercury is 4mu/kg, the quantification limit is 11mu/kg, the relative standard deviation is 5.19%, and the average recovery rate is between 89.2% and 96.7%. The sensitivity is high, the repeatability is good, the accuracy is good, and particularly the method detection limit and the quantitation limit are especially suitable for testing the methyl mercury and the ethyl mercury in the aquatic feed.

The invention provides a device for removing methyl mercury in low-temperature seawater and a manufacturing method of the device. The device is of a polyhedral structure. The polyhedral structure is provided with a polyhedral frame; wherein a polyhedral agarose gel is arranged in the polyhedral frame; a hole is formed in the center of each surface of the agarose gel and is filled with 3-mercaptopropyl functionalized silica gel; each surface of the agarose gel is covered with a nitrocellulose membrane covering the surface of the 3-mercaptopropyl functionalized silica gel and the surface of theagarose gel, and the thickness of the nitrocellulose membrane is 0.45 [mu]m. The device is not influenced by external temperature and heavy metal types, is simple in overall structure, convenient to use, high in seawater purification degree and good in removal effect of methyl mercury in low-temperature seawater, and can reduce the content of methyl mercury in the low-temperature seawater.

The invention discloses a treatment method for methyl mercury polluted water. The treatment method comprises the following steps: introducing water containing methyl mercury into a cationic resin exchanger, and stopping exchanging when the concentration of methyl mercury in a water solution flowing from the cationic resin exchanger is greater than 0.00005mg/L; taking out cationic resin, utilizing a saturated sodium chloride mixed liquor of 8-12% stannous chloride as regenerated liquid, and performing regeneration under a mixing condition, wherein the ratio of the regenerated liquid to the resin is (1-2) to 5, the mixing time is 40-60 minutes, and the temperature is 40-45 DEG C; separating the resin from mercury-containing liquid after regeneration is ended, returning the regenerated resin to the resin exchanger to recycle, and feeding the mercury-containing liquid into a sedimentation basin; adjusting the pH of the obtained mercury-containing liquid to be greater than 10 by using sodium hydroxide, and filtering the mercury-containing liquid to obtain mercury-containing sediments; smelting the mercury-containing sediments by using a smelting furnace at high temperature of 560 DEG C, recovering mercury vapor, and condensing the vapor, so as to obtain a metal mercury product. By adopting the treatment method, methyl mercury pollution in water can be removed, and the methyl mercury can be converted into metal mercury to recycle.

The invention belongs to the field of analytical chemistry, and relates to a fluorescent probe for rapidly identifying mercury and methyl mercury as well as a preparation method and application of thefluorescent probe. The structural formula of the fluorescent probe is shown in the specification. According to the prepared fluorescent probe, under the condition of not adding any other additional material, the detection sensitivity is improved, the additional material is prevented from being added, the consumption of the additional material is reduced, and the error source in detection is reduced; imaging of an object to be detected in living cells and zebra fish bodies is successfully detected in the detection process, the fluorescent probe is suitable for real-time monitoring and distinguishing of the living bodies such as the cells and the zebra fish bodies, and the method cannot be achieved in previous methods. Implementation of imaging plays a great role in promoting deep researchof distinguishing mercury and methyl mercury.

The invention relates to a method for direct extracting and concentrating methylmercury from petrol by sulfhydreyl cotton fibers, which belongs to the field of substance isolation technique and comprises: making the petrol flowing through the sulfhydreyl cotton fibers, taking off the sulfhydreyl cotton fibers tube as the petrol flowing out completely, blowing out the remnant petrol using an inner stopper, then eluting the rich methylmercury of sulfhydreyl cotton fibers using chlorhydric acid solution, collecting the chlorhydric acid eluent into a color comparison tube with the plug, sucking the purified petroleum benzene to extract the methylmercury of the eluent, drawing the upper layer benzene liquid after inaction stratification, making the methylmercury gauging by a gas chromatograph.

The invention discloses a fluorescein type ionic liquid, a synthesis method thereof and an application of the fluorescein type ionic liquid in mercury ion or methyl mercury ion detection, the chemical formula of the fluorescein type ionic liquid is [Fluo] [P66614] 2, and the structural formula is shown as a formula (I); the ionic liquid with green fluorescence emission is synthesized through a simple ion exchange method, the method is simple in synthesis step, and raw materials are simple and easy to obtain; the designed and synthesized [Fluo] [P66614] 2 fluorescent ionic liquid is high in quantum yield, good in thermal stability and small in environmental pollution; according to the method, the mercury ions and the methyl mercury ions in an actual sample can be qualitatively analyzed and quantitatively detected, and possibility is provided for rapid detection of the mercury ions and the methyl mercury ions in the actual sample;

The invention discloses a method and a device for the on-line enrichment and determination of ultra-trace methyl mercury and/or divalent mercury. The method comprises the following steps: modifying and activating an enrichment column; carrying out extraction and enrichment on methyl mercury and/or divalent mercury by utilizing the modified and activated enrichment column; eluting the methyl mercury and/or the divalent mercury enriched on the enrichment column by utilizing eluent; and separating the enriched methyl mercury and/or divalent mercury by using the eluent, and carrying out online ultra-trace determination on the methyl mercury and/or divalent mercury desorbed from the separation column by using a detector. According to the method and the device disclosed by the invention, the enrichment and elution steps are greatly simplified, the use of toxic reagents is reduced, and the green safety of the method is improved while the method and the device are suitable for detecting ultra-trace methyl mercury and divalent mercury; and on the basis of small sample size, a better detection limit effect is achieved. Therefore, the invention provides the method and the device for on-line enrichment and determination of ultra-trace methyl mercury and/or divalent mercury, which are efficient, convenient and good in performance.

The invention discloses a method and a device for removing methyl mercury in sewage by using a ternary composite nano material. The method comprises the following steps: uniformly mixing the ternary composite nano material with the sewage possibly containing the methyl mercury, thereby catalytically degrading the methyl mercury in the sewage into carbon dioxide, water and amalgam formed on the ternary composite nano material. The device comprises a sewage storage mechanism, a ternary composite nano material storage mechanism, a degradation generation mechanism, a ternary composite nano material recovery mechanism and a degradation monitoring mechanism. According to the method, the methyl mercury can be removed only by utilizing the oxidase property of the ternary composite nano material without light and no microorganisms; compared with methods for removing the methyl mercury through biodegradation, photocatalytic degradation and the like, the method has the advantages of being simpleand convenient in removal process, high in removal efficiency, high in removal speed, low in removal cost and the like, meanwhile, mercury ions entering the water body again are not generated, secondary pollution is avoided, and the methyl mercury in the sewage can be completely removed.

The invention relates to a method for detecting low-concentration methyl mercury. The method specifically comprises the following steps: firstly, adding an ammonium sulfide solution in the concentration of 5-10 mol/L into a water sample to be detected, sequentially carrying out static settlement and centrifugation according to the volume ratio of the water sample to the ammonium sulfide solution of 1: 0.02, then adding hydrochloric acid and potassium borohydride into the water sample to be detected, carrying out oscillation extraction at 45-70 DEG C by adopting an Au coated solid-phase microextraction sampler, and finally, transferring the extracted solid-phase micro-extraction sampler into a mercury measuring instrument, and measuring methyl mercury. According to the method disclosed by the invention, interference of mercury ions in detection is effectively removed, the enrichment efficiency of methyl mercury is improved, the detection of methyl mercury with lower concentration in a water body is realized, the detection limit is 0.02 mu g/L, a good linear relation is realized in a range of 0.2-10 mu g/L, and the detection method has excellent selectivity on methyl mercury.