44 results about "Trace metal" patented technology

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.

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 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.

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.

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 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 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.

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 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.

The invention relates to the technical field of functional ceramic products, in particular to original degerming and moisturizing functional ceramic and a preparation method and a use method thereof.The functional ceramic is formed by firing natural mineral argil, and the natural mineral argil is naturally enriched with at least two trace metal elements of iron, copper, zinc and manganese needed by human metabolism; the porosity of the body of the functional ceramic is 15-30%, and the functional ceramic is used in cooperation with food to be heated in a microwave oven heating scene. According to the invention, natural mineral argil is taken as a raw material, and through structural design and process optimization, triple functions of moisturizing, nutrition supplement and sterilization in a microwave oven heating scene are realized, so that the core pain point of food moisture loss is solved, trace elements required by a human body are safely supplemented, and meanwhile, the safety of food after heating can be improved; the product is stable in preparation process and convenient to use, and has high practical value and market prospect.

The invention discloses a pretreatment method for trace metal impurity detection of a high-purity electronic-grade silicon-based precursor material. The method comprises the following steps: heating and volatilizing a liquid sample in an ultrapure PTFE / PFA beaker, and redissolving by using an electronic-grade inorganic acid-organic acid composite acid system; uniform heating is achieved through a special heating plate, pretreatment volatile organic waste gas is treated in cooperation with a hundred-grade dust-free environment, a clean operation table and a tail gas condensation and collection system, meanwhile, metal impurity concentration of different degrees can be achieved through the proportion of the use amount of a pretreatment sample to the use amount of redissolved inorganic acid, the detection limit is effectively reduced to 1-5 ppt, and the detection efficiency is improved. The recovery rate of the metal impurity detection pretreatment method reaches 85%-115%. The method breaks through the defects of long pretreatment time, silicon and carbon residues, metal loss caused by severe pretreatment reaction and the like of a traditional hydrolysis and digestion method, the treatment time is shortened to 2-4 hours, the G4 / G5 level (single metal 1t, 10ppt) detection requirement is effectively met, and a high-sensitivity and low-background-interference detection scheme is provided for impurity management and control of a high-purity silicon-based precursor in an advanced process.

The invention relates to the technical field of environmental protection, and discloses a lead zinc ore tail water innocent treatment method and system.The lead zinc ore tail water innocent treatment method comprises the steps that a static semiconductor strong electrolysis technology is adopted to conduct pretreatment on lead zinc ore tail water, and volatile pollutants are removed; generating free radicals through an electrochemical micropore negative charge aeration technology to form trace lead compounds and zinc compounds; carrying out acidic micro-electrolysis treatment by adopting an electrochemical micropore negative charge aerobic acidic micro-electrolysis reaction kettle technology; chlorine dioxide micropores are adopted for slow-release disinfection treatment; performing static precipitation to obtain supernate and bottom mud; further oxidizing the bottom mud by adopting solid hydrogen peroxide particle micropore slow release; a flotation column is adopted for rinsing and enriching, and treatment of a multi-stage desliming bucket suspension separator is included; purifying by adopting magnetic separation or a shaking table, discharging and stacking tailings, and enriching and recovering trace metal elements in the tail water by adopting nematophilic bacillus organisms; and the tail water is recycled. The lead-zinc ore tail water is treated through the static semiconductor strong electrolysis module and the electrochemical micropore negative charge aeration module, and efficient removal of pollutants is achieved.

1. The name of the design product: trace metal content analyzer. 2. The use of the design product: trace metal content analyzer for laboratory. 3. The design points of the design product: in shape. 4. The picture or photo that best shows the design points: perspective view 1. 5. The design claimed contains color.

The application provides a silicon substrate digestion solution, a detection method and a kit for trace metal impurities in organosilane. The silicon substrate digestion solution comprises, by mass fraction, 1-10 parts of hydrofluoric acid, 1-3 parts of hydrogen peroxide and 1-5 parts of water. The silicon substrate digestion solution provided by the application can completely digest organosilane to obtain a sample solution through the cooperation of the specific mass ratio of hydrofluoric acid, hydrogen peroxide and water, and when the sample solution is subjected to trace metal impurity detection, the sample solution will not block the atomizer nozzle and contaminate the atomization chamber, which is conducive to maintaining the precision and service life of the detection equipment, and the sample solution is not easily affected by the operation environment to introduce impurities, and the detection precision of trace metal impurities is further improved.

The application discloses a method for high-selectivity recovery of beryllium from lithium smelting beryllium-containing clinker, and belongs to the technical field of beryllium-containing solid waste resource utilization. After the lithium smelting beryllium-containing clinker is crushed, slurry is prepared, and under the shearing action, concentrated acid is slowly added dropwise to the slurry to precisely control the pH of the slurry in the range of 3.0-3.5 to perform reaction. After the reaction is completed, solid-liquid separation is performed to obtain beryllium-containing filtrate. The beryllium-containing filtrate is subjected to precipitation by using a sodium hydroxide solution to precisely control the end-point pH of the beryllium-containing filtrate in the range of 8.5-9.0, and a composite precipitate containing beryllium hydroxide and potassium sodium cryolite is obtained. The method completely breaks the traditional situation of 'waste production waste', not only realizes efficient separation of the highly toxic beryllium, but also directly converts the beryllium-containing solid waste into 'rich beryllium potassium sodium cryolite composite concentrate' with a main phase of crystalline potassium sodium cryolite and a beryllium grade of more than 5.5%, realizing double high-value extraction of trace metals (beryllium) and bulk minerals (cryolite).

The invention discloses a bamboo-stalk bamboo induced regeneration culture medium and an induction method thereof, and relates to the technical field of plant biologication.The bamboo-stalk bamboo induced regeneration culture medium comprises trace metal elements in an exchangeable coordination state, a quinone trapping agent, a recyclable reduction couple and an antioxidant synergist; the recyclable reduction pair comprises ascorbic acid, salts and a reduced sulfur source, and reacts with the phenol oxidation product in the culture medium to reduce the phenol oxidation product into an original form; according to the phenol load index, the equivalent weight of trace metal elements, the concentration of a quinone trapping agent and the proportion of recyclable reduction pairs are dynamically adjusted; the phenol load index is determined through the absorbance or the total phenol equivalent of the short-time extraction liquid of the explant. According to the method, the adaptability, the survival rate and the regeneration efficiency of the explant are effectively improved by dynamically adjusting the components of the culture medium and accurately controlling environmental factors, and the condition that the explant obtains optimal nutrient support in different growth stages is ensured, so that healthy growth and efficient regeneration of the bamboo stalk bamboo explant are promoted.

The application discloses a kind of silting feed and its preparation method and application, the feed includes: plant feed powder 60-75 parts, polyphenol active ingredient 5-13 parts, trace metal element component 3-8 parts, organic-inorganic hybrid microcapsule structure carrier 4-9 parts, valence self-locking agent 1-5 parts, synergistic slow-release agent 2-6 parts and auxiliary material 2-8 parts;Microcapsule structure carrier is formed by organic macromolecule and inorganic nanomaterial co-deposition, polyphenol active ingredient is embedded into the inside of carrier, metal ion forms gradient distribution layer on the surface and skeleton of carrier, valence self-locking agent is coordinated with metal ion, synergistic release agent is compounded with microcapsule structure, and slow-release network is formed.The technology breaks through the technical barrier that metal ion and phenolic active ingredient synergistically catalyze oxidation inactivation, realizes the partition embedding and gradient controllable release of functional component, and guarantees the functionality and biological adaptability in the whole process of feed processing, storage and feeding.

The utility model relates to a pretreatment device for detecting metal impurities in iodo-silane and detection equipment of the pretreatment device. The pretreatment device comprises a reaction tank, an empty bottle, an absorption bottle, a heating plate, a heating belt, a first connecting pipe and a second connecting pipe; the reaction tanks are located on the heating plate, the first connecting pipes correspond to the reaction tanks in a one-to-one mode, the reaction tanks are communicated with the empty bottles through the corresponding first connecting pipes, the empty bottles are communicated with the absorption bottles through the second connecting pipes, the absorption bottles are further provided with exhaust pipes used for exhausting, and first cover holes are formed in the reaction tanks. The first cover hole is used for being in butt joint with an external gas source and adding reactants, and the heating belt is wound around the first connecting pipes to heat the first connecting pipes; aiming at the technical problems existing in trace metal impurity detection of an iodo-silane sample, the pretreatment device disclosed by the utility model has the advantages that on one hand, the iodo-silane sample is effectively prevented from being in contact with the external environment in a test process, and the sample is prevented from being polluted and lost; and on the other hand, the problem of pipeline blockage is solved, the matrix elements in the iodo-silane sample are effectively separated, the interference of the matrix elements on trace metal impurity detection in the subsequent ICP-MS determination process is eliminated, the detection sensitivity and precision are improved, and the detection analysis of trace metal impurities under a complex matrix is realized.

The invention belongs to the technical field of high-end instrument analysis in the technical field of chemical analysis, and discloses a method for detecting trace metals in electronic-grade nitric acid. According to the method, inductively coupled plasma mass spectrometry is applied to test the content of the metal ions in the electronic-grade high-purity nitric acid, and four different modes of a standard mode, cold flame ammonia gas, hot flame ammonia gas and hot flame oxygen are respectively used for testing. According to the method, parameter optimization of the inductively coupled plasma mass spectrometry under different conditions is utilized, the trace metal impurities of the electronic-grade nitric acid with metal ions smaller than 10 ng / L are tested, meanwhile, the problem that interference on testing of multiple elements under the hot flame general condition of the inductively coupled plasma mass spectrometry is large is solved, rapid, efficient and stable detection can be achieved, and the method is suitable for large-scale popularization and application. And the method is simple to operate, short in time consumption, low in test cost and high in accuracy.

The present application relates to oilfield tracer method technical field, it is a kind of oilfield trace usage method of trace material in complex layer, including for the working condition of reservoir is complex layer, tracer is added in the injection well using layered injection mode, tracer is used between layer and layer and is distributed in plane dislocation, tracer includes trace metal element;Sampling is carried out in oil production well;The sample is analyzed, and the tracer content of sample is obtained.The trace usage method of oilfield trace material in complex layer can identify the communication relationship between injection well and its corresponding oil production well, the percolation direction of fluid, the heterogeneity of oil reservoir, and the channeling identification of each layer, which provides a theoretical basis for further developing water drive / gas drive dynamic analysis and measure adjustment.

The present application provides a kind of detection method of ash in asphalt.The detection method includes: step S1: raw materials including asphalt and dispersant are heated and mixed in sequence to obtain melt;Step S2: melt is crystallized to obtain asphaltene crystal;Crystallization treatment includes temperature drop and isothermal crystallization treatment in sequence;The temperature drop rate of temperature drop is ≤5℃ / min;Step S3: asphaltene crystal is phase separated to obtain crystalline phase;Step S4: crystalline phase is ashed to obtain ash;The temperature of ashing treatment is ≤200℃;Step S5: ash is detected to obtain the composition and mass content of ash.The detection method of the present application can realize efficient enrichment of ash and very low background interference, can detect most of the trace metal elements in ash, and has good accuracy and repeatability, thereby better meeting the quantitative detection needs of high-quality asphalt for very low ash content.

The invention provides an electronic grade fluorine-containing mixed gas trace metal element analysis processing method and system, and the method comprises the steps: collecting a fluorine-containing mixed gas liquid sample, processing initial data through a spectrum analysis algorithm, and obtaining fluorine ion concentration distribution and a metal signal initial value; quantifying the interference intensity level according to the fluorine ion concentration distribution, and determining a metal signal initial value deviation range corresponding to the interference intensity level; calculating an inter-batch difference degree from the corrected metal signal value, and judging whether the inter-batch difference degree is within a preset allowable interval to confirm the signal consistency; the multiple batches of corrected metal signal values are processed through a data fusion algorithm, and fused metal signal values and batch fluctuation correction values are obtained; according to the batch fluctuation correction, applying an iterative adjustment process to update the fusion weight, and determining trace metal concentration values with consistent batches; and extracting a purity evaluation value from the trace metal concentration values consistent in batch to obtain a metal content detection result after fluorine ion interference is inhibited.

The application discloses a graphene-based material used as slow-release fertilizer and a preparation method and application thereof. The synthesized reduced graphene oxide film can be used as a novel trace metal element carrier and has the unique performance of slowly releasing ions, can make the metal elements be efficiently and slowly released to soil and be converted into the exchangeable state which can be easily absorbed by plants, and is especially beneficial to the establishment of high-nutrition soil, and provides favorable conditions for subsequent planting of crops rich in nutrition elements.

The application discloses a method for detecting trace metal contaminants on a wafer surface with Si3N4 film, and belongs to the technical field of wafer quality detection. The method comprises the following steps: etching the surface of a wafer to be detected by using a mixed atomizing gas of HF and HNO3; the etching frequency is equal to or greater than the thickness of the Si3N4 film on the surface of the wafer to be detected / 150; during each etching process, the mixed atomizing gas is introduced at a speed of 1800-2200 sccm for 10-20 s; a scanning liquid for collecting metal ions is used to dissolve the metal on the wafer surface obtained through the above pretreatment, and the metal concentration in the dissolved liquid is tested. The above pretreatment method is simple in operation, short in time consumption, and can quickly and effectively remove the Si3N4 and SiO2 on the wafer surface, so that the wafer surface is not hydrophilic due to the residual Si3N4, and the scanning liquid for collecting metal ions is not adsorbed, so that the test result of the metal contaminants on the wafer surface can be obtained.

Described is a method for detecting trace metal anomalies in soil. Soil samples are collected from an area of interest. The soil samples are prepared such that particle size and moisture content of each soil sample is normalized. An extraction solution having an amount of a carboxylic acid, an amount of a chelating agent, and an amount of a strong base is prepared. Using the extraction solution, a soil extract is obtained from each soil sample. Using a spectral instrument, a spectral analysis of each soil extract is performed to detect a chemical element. Based on the spectral analysis, presence of a hydrocarbon microseepage in the area of interest is determined.

The invention discloses a SiGe / Si etching solution with a high etching rate and a preparation method of the SiGe / Si etching solution. The etching solution mainly comprises the following components in percentage by mass: 0.1-1% of a fluorine ion source; 10-50% of an oxidizing agent; 0.1-1% of an inorganic acid; 5-10% of an organic acid; 0.1-1% of a dispersant; 0.1-1% of a stabilizer; and the balance of high-purity water. According to the stabilizer, organic phosphonic acid and organic amine are combined to form an efficient and stable system, and the core effect of the stabilizer is that trace metal impurity ions (such as Fe < 3 + > and Cu < 2 + >) in a solution can be effectively chelated, the catalytic action of the metal impurity ions on nitric acid decomposition is inhibited, and generation of gas byproducts such as NO and NO2 is reduced; therefore, the chemical stability and the storage life of the etching liquid are remarkably improved, the pH value of the etching liquid can be stabilized, the etching rate drift caused by nitric acid concentration fluctuation is effectively relieved, and it is ensured that the activity and the stability of main etching components are kept within the optimal pH range.

This invention relates to the field of hafnium oxide preparation technology, specifically to a method for preparing ultra-low iron content hafnium oxide. This method is based on N235 extraction and separation under hydrochloric acid. The hafnium oxide ore is crushed and coarsely ground to obtain hafnium oxide powder. Then, it undergoes alkali fusion decomposition treatment and acid leaching to remove impurities, resulting in a zirconium-hafnium mixed solution. Through extraction and back-extraction, a hafnium-enriched solution is obtained, which is then treated with an ion exchange resin to obtain a high-purity hafnium solution. Finally, saturated ammonia is added, and the resulting precipitate is filtered, washed, dried, and then calcined to obtain ultra-low iron content hafnium oxide. In this invention, while achieving zirconium-hafnium separation, other trace metal cations, especially iron ions, are sufficiently removed, reducing the iron content and thus obtaining ultra-low iron content hafnium oxide.