78 results about "Trace metal" patented technology

The invention relates to the technical field of spectral analysis, and discloses a method and a system for detecting the concentration of trace metal ions. The method comprises the following steps: acquiring original spectral response data of an electronic smoke sample; carrying out signal separation by utilizing a frequency domain feature extraction technology to obtain an initial spectrum data set; performing background noise filtering and baseline drift correction on the initial data to obtain a refined spectrum data set; constructing a concentration-wavelength mapping relation through absorption peak positioning and characteristic wave band screening on the basis of the refined spectrum data set; carrying out continuous time sequence sampling on the samples based on the mapping relation to generate a concentration dynamic change data set; analyzing a concentration fluctuation rule and an abnormal point in the dynamic data, and generating concentration risk assessment data; and finally outputting a time sequence detection file. According to the method, high-precision dynamic monitoring and intelligent risk assessment of trace metal ion concentration are realized, interference is effectively inhibited, and sensitivity and early warning capability are improved.

The invention discloses a method for detecting the content of trace metal ions in a diazo naphthoquinone photosensitizer. The method comprises the following steps: sample pretreatment: weighing diazonaphthoquinone photosensitizer powder in a clean room, putting the diazonaphthoquinone photosensitizer powder into a cleaned and dried wide-mouth PFA bottle, adding an organic reagent, and carrying out ultrasonic treatment until a solid is completely dissolved; the method comprises the following steps: testing: adding a metal standard substance into an organic solvent to prepare three standard solutions with different concentrations; debugging an instrument, determining target metal in the standard solution in a Cool mode, a No Gas mode and a He mode by using an inductively coupled plasma mass spectrometer to obtain a signal intensity value (CPS value) corresponding to each metal ion concentration in the standard solution, and establishing a standard curve; and measuring the sample in which the photosensitizer is dissolved by using the same steps to obtain the content of metal ions in the sample. According to the method, appropriate detection conditions are optimized for different elements to be detected in the diazo naphthoquinone photosensitizer, polyatomic ion interference and matrix effect in a sample are mainly reduced, the content of 16 metal ions can be accurately detected at the same time, and the test efficiency is high.

The invention relates to an atmospheric pressure glow discharge atomic emission spectrum analysis device and a detection method. The device comprises an ultrasonic atomization-membrane desolvation sampling system, a high-voltage power supply, an excitation source and a spectrum detection system. The high-voltage system outputs pulse voltage and a synchronous TTL level signal; and the TTL level signal is connected to a detection system. The excitation source is atmospheric pressure glow discharge micro-plasma, and the stable glow discharge micro-plasma can be maintained under atmospheric pressure. The monopulse modulation analysis device provided by the invention effectively solves the problem of insufficient heavy metal excitation efficiency caused by the fact that the discharge current is limited to 20-35mA in the existing atmospheric pressure glow discharge technology. The ultrasonic atomization-membrane desolventizing sampling device can directly sample a liquid sample which is not suitable for volatilization, complex pretreatment is not needed, and the desolventizing membrane is used for removing water from aerosol, so that sensitive and rapid atomic analysis is realized. The device is suitable for efficient detection of trace metal elements, and has the advantages of being simple in structure, low in cost, suitable for real-time online analysis and the like.

The utility model discloses a device for separating trace metal from solid waste, which comprises a grinder, a powder mixer, a rotary molten slurry furnace, a pressurizing pipe blowing device, a container and a water cooling tank, the outlet of the grinder is connected with the inlet of the powder mixer, the outlet of the powder mixer is connected with the inlet of the pressurizing pipe blowing device, and the container is connected with the water cooling tank. An outlet of the pressurizing pipe blowing device extends into the rotary molten slurry furnace, an inclined rotating mechanism for controlling the rotary molten slurry furnace to rotate and incline is arranged outside the rotary molten slurry furnace, the rotary molten slurry furnace is provided with a pouring edge opening, the lower part of the edge opening is connected with a container, and the container is conveyed into a water cooling tank through hoisting to cool and shape molten slurry. The solidified and shaped molten slurry is fed into an inlet of a grinding and crushing machine through a spiral conveyor, an outlet of the grinding and crushing machine is connected with a magnetic separator, and metal crushed aggregates obtained by the magnetic separator enter a storage box through a discharging valve; the device disclosed by the utility model can realize recovery of trace metals in high-temperature molten steel slag.

This invention discloses a wheat-specific fertilizer suitable for rice-wheat rotation and its preparation method, comprising the following steps: mixing equal volumes of carboxymethyl chitosan solution, composite biochar dispersion, and agar solution, then adding sodium tripolyphosphate solution dropwise, stirring, allowing to stand, dialyzing, and freeze-drying to obtain hydrogel particles; swelling the hydrogel particles in a mixed aqueous solution of urea and superphosphate, filtering, and vacuum drying to obtain the wheat-specific fertilizer suitable for rice-wheat rotation; this invention uses a coating material to coat composite biochar powder, nitrogen fertilizer, and phosphate fertilizer, and improves the utilization rate of nitrogen and phosphate fertilizer through the slow-release effect of the coating material; by adsorbing fixed trace metal elements through the coating material, the slightly acidic state of the phosphate fertilizer during dissolution is used to convert the adsorbed fixed trace metal elements into a free state, and then titanium aluminum carbide promotes the movement of the free trace metal elements, thereby promoting the absorption and utilization of trace metal elements by wheat roots and improving wheat yield and quality.

The invention discloses a preparation method and application of a degradable cellulose nano-fibril-metal composite material. The preparation method comprises the following steps: S1, preparing a cellulose nano-fibril carrier; S2, chelating metal ions; and S3, carrying out film treatment. The application refers to the application in crop rhizosphere or phyllosphere micronutrient supplement. The invention develops a compound fertilizer system which takes natural cellulose nanofibril as a carrier and chelates trace metal ions through functional groups such as surface carboxyl / hydroxyl and the like, and the compound fertilizer has high specific surface area and stronger metal ion loading capacity; stable loading and slow release are realized through interface adsorption and complexation; the material is completely degradable and is ecological and environment-friendly; the fertilizer can be applied to soil or leaf surfaces and is suitable for various crop types; the process is simplified, and the method has the advantage of convenient industrial popularization.

A composition includes one or more analytes for use with an electrochemical sensor configured to detect a component of a biological sample, and a quinolones at a concentration of 60 milligrams / liter (mg / L) to 120 mg / L in the composition, to stabilize oxygen in a presence of trace metal.

To more precisely measure the concentration of a trace amount of metal contained in treated water.SOLUTION: An analysis system 300 for analyzing a metal concentration of a liquid includes a pretreatment device 100 for decomposing an organic substance contained in the liquid, and a measurement device 200 for measuring the metal concentration of the liquid in which the organic substance is decomposed by the pretreatment device 100.SELECTED DRAWING: Figure 3

The present disclosure provides methods for determining concentration of various trace metal ions in aqueous solutions, such as gold plating solutions. At a particular fixed reduction potential, the cathodic current can suddenly increase in magnitude after a certain period of time (e.g., an incubation time) passes in the presence of a trace metal ion (e.g., Tl(I)), where the incubation time is inversely proportional to the concentration of trace metal in the electrolyte. The concentration of the trace metal can be calculated after measuring the incubation time and comparing it against a calibration curve.

The invention discloses an axle laser cladding repairing method and structure based on gradient phase change regulation, and the method comprises the following steps: cladding an interface layer, a transition layer and a surface layer in sequence through a laser cladding method to form a gradient cladding structure; cladding the first mixed powder on the surface of the axle base body by adopting a low-heat input cladding process to form an interface layer; wherein high-Cr and Ni powder is adopted in the first mixed powder, and the first mixed powder is used for expanding the temperature interval of an austenite phase region; cladding the second mixed powder on the surface of the interface layer by adopting a slightly high heat input cladding process to form a transition layer; wherein the second mixed powder contains trace metal elements B and Mo; cladding the third mixed powder on the surface of the transition layer by adopting a rapid cooling cladding process to form a surface layer; wherein low-C and high-Si alloy powder is adopted as the third mixed powder, a lath martensite structure is formed, martensite phase change volume expansion is achieved, and surface pressure stress is introduced.

The present disclosure relates to a process of treating an aqueous stream from an industrial process. Specifically, the disclosed process reduces the cyanide-containing impurities and trace metal contaminants from the aqueous stream, such as to facilitate subsequent biological treatment, hydrogen gas generation by electrolysis or direct water recycle for reuse.

Example compositions include one or more analytes for use with an electrochemical sensor configured to detect a component of a biological sample, and a quinolone-based compound at a concentration of 60 mg / L (mg / L) to 120 mg / L in the composition, and the quinolone-based compound is used to stabilize oxygen in the presence of a trace metal.

Electrochemical systems, devices, and methods for quantitative analysis of the concentration of a target analyte ionic species (e.g., arsenic (III) or arsenic (V), lead, cadmium, or copper) in a liquid sample. The system provides a convenient, reliable and accurate target analyte concentration determination method using voltammetry analysis as an analysis technology. An electrochemical instrument and sensor including a working electrode, a reference electrode, and a counter electrode are configured to perform anodic stripping voltammetry (ASV) and determine a target analyte within a large concentration range. The system provides an apparatus and method for normalizing the resulting peak current using the initial plating / pre-enrichment current by applying at least one arithmetical operation to the peak current, the arithmetical operation comprising dividing the peak current by the sum of charges or currents measured during electrodeposition.

The utility model discloses a digestion device for analyzing trace metal elements in high-purity quartz, and relates to the technical field of equipment for analyzing trace metal elements in quartz, the digestion device comprises a digestion unit, the digestion unit comprises a PFA tank body, the PFA tank body is internally provided with a reaction cavity, and the reaction cavity is internally provided with a reaction cavity; a gas inlet pipe, a gas outlet pipe and a liquid adding pipe which are respectively communicated with the reaction cavity are arranged on the PFA tank body, a gas inlet valve and a gas outlet valve are respectively arranged on the gas inlet pipe and the gas outlet pipe, and a sealing cover is arranged at the liquid adding end of the liquid adding pipe. The PFA tank body is used as the reaction cavity, the appearance is transparent, the reaction completion condition in the reaction cavity is convenient to observe, the PFA tank body is resistant to high temperature and strong acid, metal elements are prevented from being dissolved out of the reaction tank and hydrofluoric acid, and the analysis accuracy of trace metal elements in quartz is improved.

The invention provides a method for improving metalized binding force of quartzite by combining strong cleaning with a glass transition layer. The method comprises the following steps: S1, pre-cleaning a quartzite substrate; s2, a SiO2 glass transition layer is deposited on the surface of the cleaned quartzite substrate through magnetron sputtering; s3, carrying out annealing and curing treatment on the substrate on which the SiO2 glass transition layer is deposited; s4, sequentially depositing a TiW adhesion layer and a Cu functional layer on the surface of the cured SiO2 glass transition layer; and S5, carrying out spin coating, exposure, development, electroplating thickening and etching on the Cu functional layer to form a metalized pattern. By introducing the strong chemical cleaning step, trace metal impurities on the surface of the quartz stone can be specifically and efficiently removed, the substrate surface with ultrahigh cleanliness and high surface energy is obtained, and weak binding force points caused by interface pollution are fundamentally eliminated.

A method for making the EDA that is suitable for use in thin-film semiconductor processing applications, are disclosed. The EDA is purified to remove water and trace metals. Water levels below about 50 ppm by weight are achieved by passing liquid through 3A type molecular sieve in a packed bed. Metallic impurities are removed by distillation and the resulting product is packaged in specially dried and optionally pre-conditioned containers.

The invention discloses a method for detecting trace metal elements in a liquid sample by combining laser processing enrichment substrate with high repetition frequency scanning LIBS (laser-induced breakdown spectroscopy), which comprises the following steps of: preparing micro-structure hydrophilic enrichment points with controllable size and high consistency on a super-hydrophobic surface by utilizing a laser processing technology; uniform, repeatable and highly controllable evaporation and enrichment of a liquid sample in form and size are realized, evaporation residues of the liquid sample are analyzed by combining high repetition frequency pulse laser, the whole sample residual area is covered by focus scanning, analysis result variation caused by sample non-uniformity is reduced to the greatest extent, and the analysis accuracy is improved. And sensitive and high-repeatability element analysis is realized.

The invention discloses an application of an OsYSL12 gene or a protein coded by the OsYSL12 gene in increasing the content of metal trace elements in rice grains, and belongs to the technical field of gene engineering. The rice OsYSL12 gene involved in the invention is derived from cultivated rice Nipponbare. According to the invention, an OsYSL12 gene in rice is knocked out; through detection, a homozygous knockout mutant of the OsYSL12 is obtained. The yield of a single plant of different mutants is not obviously different from that of a wild type, but the content of metal trace elements manganese, zinc and copper in brown rice is obviously increased compared with that of a contrast, so that the brown rice has better nutritional quality. Therefore, the method for knocking out the rice OsYSL12 gene to strengthen the metal trace elements in the grains, provided by the invention, has an important application value and can generate good economic benefits.

The invention relates to the technical field of a produced liquid stratum source identification method, in particular to a method for judging an oilfield produced liquid stratum source, which comprises the following steps of: calculating the similarity S1 between a crude oil trace metal element fingerprint spectrum of a sample to be determined and a crude oil trace metal element standard fingerprint spectrum of a target stratum; the similarity S2 between the stratum water trace metal element fingerprint spectrum of the sample to be determined and the stratum water trace metal element standard fingerprint spectrum of the target stratum is calculated, if the S1 and the S2 are both larger than 0.9, the produced liquid from the stratum to be determined comes from the target stratum, and if the S1 and the S2 are not larger than 0.9 at the same time, the produced liquid from the stratum to be determined does not come from the target stratum. According to the method, the trace metal element composition of the crude oil and the formation water in the produced liquid is converted into the trace metal element fingerprint spectrum for the first time to determine which formation the produced liquid comes from, so that the difference information of the crude oil and the formation water in the produced liquid can be more intuitively reflected, and the accuracy of judging the source of the produced liquid is improved.

The present disclosure relates to an apparatus for treating an aqueous stream from an industrial apparatus. Specifically, the disclosed apparatus reduces the cyanide-containing impurities and trace metal contaminants from the aqueous stream, such as to facilitate subsequent biological treatment, hydrogen gas generation by electrolysis or direct water recycle for reuse.

This invention belongs to the field of scintillator material preparation technology, specifically relating to a method for purifying high-purity cesium iodide and its application in the preparation of cesium iodide scintillator screens. The method involves sequentially mixing and heating cesium iodide-containing waste and residual materials to dissolve them, filtering and removing impurities, adsorption and removing impurities, concentrating and temperature-controlled crystallization, centrifuging, drying, and vacuum packaging. This process comprehensively removes solid particulate impurities, elemental iodine, and various trace metal ions from the raw materials, effectively preventing oxidation and deterioration during purification. The method is simple to operate, highly industrially feasible, and can purify waste materials to a high purity level that meets the requirements of high-performance applications. It allows for the reuse of waste materials at the same purity level, reducing production costs, alleviating raw material supply pressure, and complying with environmental protection requirements. Applying the high-purity cesium iodide obtained by this method to the preparation of cesium iodide scintillator screens using a vacuum thermal evaporation process ensures the excellent performance of the scintillator screens, making them suitable for high-end fields such as medical imaging and non-destructive testing.

The invention relates to the technical field of transformer insulating oil, and discloses an adsorption decolorization process of natural ester insulating oil. According to the adsorption decolorization process, activated carbon, calcium oxide and water are firstly adopted to prepare a calcium-based alkaline adsorbent, and then the calcium-based alkaline adsorbent is mixed with natural ester insulating oil for adsorption decolorization; and filtering the natural ester insulating oil after adsorption and decoloration to obtain the base oil after adsorption and decoloration. According to the method, the calcium-based alkaline adsorbent with activated carbon and calcium oxide as components is used for adsorbing and decolorizing the natural ester insulating oil, so that common pigments in the vegetable oil can be preliminarily removed, and impurities, trace metals and some odor substances in the vegetable oil can be removed. According to the adsorption decolorization process, the acid value and the dielectric loss factor in the vegetable oil can be reduced, so that the natural ester insulating oil reaches a relatively excellent level, and subsequent refining procedures and operations are reduced.

The invention provides a preparation method of trace metal element doped carbon dots, which comprises the following steps: mixing biomass, trace metal elements, a strong alkali solution and a strong oxidant in ultrapure water, pouring the obtained mixed solution into a reaction kettle for hydrothermal reaction, and cooling to room temperature after the reaction to obtain a reaction solution; and filtering the reaction solution, adjusting the pH value of the obtained filtrate, and dialyzing to obtain a solution which is the trace metal element doped carbon dot material. The prepared trace metal element doped carbon dot material promotes the salt tolerance and metal stress resistance of plants, the trace metal element doped carbon dots are suitable for seed soaking before plant sowing or irrigation and spraying in the plant seedling stage, the adaptability of the plants in a salinization environment or heavy metal contaminated soil is enhanced, and seed germination and seedling growth are promoted. The trace metal element doped carbon dot material prepared by the method is wide in raw material source, low in cost, easy to store, relatively high in practicability and beneficial to popularization.

The invention discloses a method for detecting the content of trace metal elements in electronic-grade potassium hydroxide, and belongs to the technical field of electronic chemical detection. The detection method comprises the following steps: diluting an electronic-grade potassium hydroxide sample, and detecting the contents of 27 trace metal elements in the electronic-grade potassium hydroxide by adopting a standard addition method and combining an octupole collision / reaction tank technology with an inductively coupled plasma mass spectrometer. The method has the advantages of simplicity and convenience in operation, high sensitivity, high accuracy, wide linear range, strong anti-interference capability and the like, can effectively detect the content of trace metal ions in the electronic-grade potassium hydroxide, and provides powerful technical support for quality control of the electronic-grade potassium hydroxide.

A method of regulating metal homeostasis includes identifying an aptamer having an affinity for a target trace metal, and introducing the aptamer to the target trace metal for sequestering metal ions of the target trace metal to generate a bound aptamer. The bound aptamer may then be directed (injected, ingested, or expunged) around a patient physiology for manipulating the sequestered metal ions based on therapeutic directives. When a harmful metal is to be mediated, the aptamer is directed to a physiological region for sequestering metal ions for removal. When a deficient presence is to be increased, the bound aptamer is directed to a physiological region for increasing the presence of the target trace metal in the physiological region. The trace metals may include metals and metalloids such as iodine, copper, iron, manganese, zinc, selenium, cobalt and molybdenum.

The application relates to the technical field of inorganic high-purity powder material preparation, in particular to a continuous preparation process of high-purity magnesium oxide particles, the purity of the magnesium oxide particles is not less than 99.95%, the D50 particle size is 1.8-2.1 mu m, the particle size distribution span is 0.70-0.85, the total content of trace metal impurities is 2.1-4.2 ppm, the thermal weight loss rate is 0.04%-0.08%, and the bulk density is 0.48-0.55 g / cm 3 3 . The application adopts a continuous production mode, replaces a traditional batch process, realizes whole-process continuous operation of raw material feeding, reaction, crystallization, washing, drying, calcination and grading, greatly improves the stability and uniformity of a production process, eliminates batch quality differences, and adapts to industrial large-scale production requirements.​

The utility model discloses a powder coating trace metal impurity removing and sorting device which comprises a filtering cylinder, a first filtering plate and a second filtering plate, cylinder covers are installed at the two ends of the filtering cylinder, a discharging opening is formed in the lower half portion of the filtering cylinder, the first filtering plate is arranged in the discharging opening, a groove body is installed in the center of each cylinder cover, and a plurality of grooves are formed in the groove body. A collecting shell is arranged in the groove body and the shaft hole, an annular groove is formed in the inner side face of the cylinder cover, a ring body is movably arranged in the annular groove, the two ends of the second filter plate are installed on the ring body, and a driving mechanism for driving the ring body to rotate is installed on the cylinder cover. The powder coating filtering device is simple in structure, filtering can be rapidly conducted through combination of the first filtering plate and the second filtering plate, along with rising of the second filtering plate, powder coating can be filtered, metal impurities are intercepted, after the second filtering net rotates to a certain angle, the metal impurities can automatically slide into the collecting shell along the inclined second filtering plate, and the powder coating filtering device is convenient to use. And impurities can be conveniently collected.

The invention discloses a method for determining trace metal impurities in electronic-grade hydroxylamine, which comprises the following steps: diluting a hydroxylamine sample by preparing a composite extracting solution which has a pH value of 5.5 + / -0.2 and contains ammonium citrate, ammonium acetate and EDTA (Ethylene Diamine Tetraacetic Acid), effectively inhibiting hydroxylamine decomposition and stabilizing metal ions, and determining trace metal impurities in electronic-grade hydroxylamine by combining a triple quadrupole inductively coupled plasma mass spectrometry technology. The interference of polyatomic ions is eliminated by utilizing the cooling atomization and dynamic reaction tank functions, and finally, quantification is performed by adopting a matrix-matched standard curve method. The method solves the technical problems of low metal ion detection recovery rate and poor accuracy caused by chemical instability of electronic-grade hydroxylamine, has the advantages of safety in operation, high sensitivity, stable recovery rate and the like, and provides a reliable analysis means for quality control of key chemicals in a semiconductor manufacturing process.

The invention discloses a humic acid chelating type chelating fertilizer and a preparation method thereof, and belongs to the technical field of fertilizers, the humic acid chelating type chelating fertilizer comprises ammonium salt, phosphor salt, potassium salt, citric acid, activated humic acid, and medium trace metal element salts; the activated humic acid comprises at least one of fulvic acid, ulmic acid and brown humic acid; the medium trace metal element salt comprises at least one of calcium salt, magnesium salt, copper salt, ferric salt and manganese salt. According to the humic acid chelating type chelating fertilizer, medium elements in soil can be fully utilized, absorption and utilization of phosphorus and sulfur non-metal ions by plants can be further promoted, and therefore the disease resistance of the plants is improved, and the yield of the plants is increased.

The invention belongs to the field of biomedical engineering materials, and aims to provide a biodegradable bone repair material capable of 3D printing and a preparation method thereof. Biological 3D printing is an emerging subject of additive manufacturing and biomedicine cross fusion, and the tissue engineering scaffold obtained through biological 3D printing has good biocompatibility and excellent biological activity. The degradable bone repair material and 3D printing are combined. Degradable polylactic acid and an inorganic biological material are fused, polycaprolactone-ZnO is subjected to electrostatic spinning to enhance the supporting strength of the material, and meanwhile hydroxyapatite and trace metal elements needed by bone tissue growth are added. In clinical application, the bone repair material plays a supporting role in cell division and new tissue generation. In clinical application, the bone repair material plays a supporting role in cell division and new tissue generation. Along with gradual degradation of the repair material in a living body, the degradation product does not generate host reaction to the living body, and meanwhile, secondary trauma and medical cost caused by the fact that a patient needs to carry out a secondary operation to take out an implant material after bone repair are reduced.