35 results about "Acid digestion" patented technology

The invention relates to the technical field of element detection, in particular to a method for measuring the manganese content in copper concentrate, which comprises the following steps: weighing a copper concentrate sample with the mass of m in a tetrafluoroethylene beaker, and adding a small amount of water to soak the sample; adding nitric acid and hydrochloric acid, and heating at 200-300 DEG C for 5-10 minutes; then adding perchloric acid and hydrofluoric acid, heating at 200-300 DEG C until the copper concentrate sample is completely dissolved, and cooling to room temperature; adding dilute nitric acid, and heating to dissolve the separated salt crystals to obtain a to-be-detected pre-solution; transferring the to-be-detected pre-solution to a volumetric flask, adding water to dilute the pre-solution to a scale line, and uniformly shaking to obtain a to-be-detected solution; according to the method, a nitric acid-hydrochloric acid-perchloric acid-hydrofluoric acid mixed acid digestion system is adopted, so that the manganese element in the copper concentrate is completely dissolved, and the interference of a complex matrix on manganese determination is effectively solved; by combining the high sensitivity and multi-element analysis capability of the inductively coupled plasma emission spectrometer, a linear standard curve of a manganese element characteristic spectral line and concentration is established, and the accuracy and precision of quantitative analysis are remarkably improved.

The invention belongs to the field of animal feed, and particularly relates to a method for predicting sorghum amino acid digestibility of white feather broilers. Comprising the following steps: determining the chemical component content of sorghum from different producing areas; preparing test feed and feeding the white feather broilers; determining the standard ileum amino acid digestibility of the white feather broilers of the sorghum from different producing areas in a certain day age; and determining a white feather broiler sorghum standard ileum amino acid digestibility prediction equation. The established prediction equation can accurately predict the standard ileum amino acid digestibility of the white feather broiler sorghum, so that the method plays a practical guiding role in efficient utilization of sorghum resources and accurate preparation of feed.

The invention relates to the technical field of analytical chemistry and mineral detection, in particular to a method for detecting potassium element in molybdenum concentrate, which comprises preparation, working curve solution preparation and inductively coupled plasma emission spectrometer detection. Through acid digestion, microwave treatment and instrument parameter optimization, the problem of matrix interference is solved, the detection sensitivity and efficiency are improved, the detection limit is greatly reduced, and the standard recovery rate is improved. The method is suitable for rapid quality monitoring of molybdenum concentrate, can be expanded to detection of other potassium-containing minerals, is combined with automatic equipment or an online monitoring system, improves the detection consistency and real-time performance, and has important application value.

The invention discloses a method for determining and analyzing lead, cadmium, iron and zinc in lead smoke dust through X-ray fluorescence spectrometry, and belongs to the technical field of determination and analysis of components of comprehensively recycled lead smoke dust in zinc smelting production. The method comprises the following steps: preparing an analysis sample by adopting a direct tabletting method without acid digestion of a sample and directly preparing soot powder under the working pressure of 30-40T and the dwell time of 15 seconds. A multiple regression correction method is adopted to correct matrix interference, a Pb L beta 1 element spectral line is selected to eliminate overlapping interference of a Pb K alpha 1.2 spectral line and an As K alpha 1.2 spectral line, and then a correction formula is added. The sample does not need to be subjected to complex chemical treatment, the original state of the cigarette ash sample can be kept, and multiple analysis or other subsequent tests can be carried out on the same batch of samples. The method can be used for simultaneously analyzing multiple elements, namely simultaneously determining multiple elements in the soot from macroelements to microelements such as Pb, Zn, Cd, Fe and the like, so that the analysis efficiency is greatly improved.

The invention belongs to the technical field of soil and sediment detection, and particularly relates to a method for measuring the content of a tin element in soil and sediment, which comprises the following steps: S1, sample treatment; the method comprises the following steps: weighing a soil or sediment sample, adding an acid solution and ultrapure water, carrying out gradient heating digestion, and fixing the volume with acid after digestion to obtain a test solution; the method is different from a conventional four-acid digestion method, and digesting is carried out by using a diacid digestion method of nitric acid and hydrofluoric acid and a full-automatic graphite digestion method; s2, tin content determination: taking the test sample solution, injecting the test sample solution into an inductively coupled plasma mass spectrometer to obtain test data, and calculating the content of the tin element in the test sample solution according to the test data. The tin element is measured by combining the inductively coupled plasma mass spectrometer, the detection mode is matched with an optimized gradient heating and diacid full-automatic digestion method, the accuracy and reliability of a detection result can be guaranteed, and the method is suitable for accurate analysis of the tin element in soil and sediments.

The invention relates to a sample pretreatment method for chromite microelement analysis. The method comprises the following steps: firstly, treating a sample to specific particle size distribution (Dv (50) lt, 5 [mu] m, Dv (90) lt, 20 [mu] m) through physical accurate grinding, and then adopting an improved two-step acid dissolution and digestion process: firstly, destroying main crystal lattices of minerals by using mixed acid, then, carrying out targeted dissolution on a residual insoluble phase by using aqua regia, and finally, carrying out chlorine removal treatment to obtain a solution to be detected. Through the synergistic effect of physical accurate grinding and secondary acid dissolution, almost complete decomposition of chromite is achieved, especially the extraction efficiency of key indissolvable elements such as Sc and Zn is improved by 20% or above, the accuracy and precision of ICP-MS analysis results are remarkably improved, and the problem that microelement measured value systematicness is low due to incomplete dissolution in a traditional method is solved.

The invention discloses a method and a device for testing a magnetic substance of a battery negative electrode material, and the method comprises the following steps: dispersing the battery negative electrode material in absolute ethyl alcohol to form a mixed solution; performing ultrasonic pretreatment on the mixed solution to desorb the magnetic substance from the battery negative electrode material to form a mixed solution after ultrasonic treatment; adsorbing a magnetic substance desorbed from a battery negative electrode material through a magnetic rod coated with polytetrafluoroethylene; after the adsorption is finished, cleaning the magnetic bar which adsorbs the magnetic substance and is coated with polytetrafluoroethylene, and carrying out acid digestion treatment to obtain a digestion solution; based on the digestion solution, the content of the magnetic substance is tested through an inductively coupled plasma instrument, and testing of the magnetic substance of the battery negative electrode material is completed. The problem of incomplete adsorption caused by retention of magnetic substances in holes due to the porosity of the negative electrode material can be improved, so that the desorbed magnetic substances are captured immediately; the method can be compatible with conventional equipment in a laboratory, is economical and simple and convenient to operate, and improves the accuracy and reliability of the test to a greater extent.

The application provides a high-temperature acidolysis device and method for uranium-containing polymetallic silicate ore, and relates to the technical field of hydrometallurgy. The device is used for high-temperature acidolysis of uranium-containing polymetallic silicate ore, the function structure of a slurry preparation tank is designed, and material is added in batches in sections, so that the risk of slurry tank overflow is reduced, and the time for slurry preparation is shortened; the reaction heat and dilution heat are used to make the material mature in the stirring tank, so that the energy consumption is reduced, and the reaction time in the subsequent high-temperature acidolysis process is shortened. The solidification of the slurry and the high-temperature acidolysis equipment are modularized and connected in series, and are carried out in the paddle stirring equipment, so that the rapid solidification of the slurry and the fine control of the high-temperature acidolysis process are realized, the technical problems of material caking and scarring in the high-temperature acidolysis are effectively solved, the energy consumption is reduced, the amount of waste gas generated in the acidolysis process is reduced, and the equipment floor area is saved.

The invention provides a preparation method of a red-mud-based photoelectrode and application of the red-mud-based photoelectrode in photoelectrocatalysis, and belongs to the technical field of solid waste resource utilization and photoelectrocatalysis. Industrial solid waste red mud is used as a raw material, a precursor solution is obtained through acid digestion treatment, a solution system is optimized by regulating and controlling the pH value, a thin film grows on a substrate material through the hydrothermal deposition technology, and finally the red mud-based photoelectrode is obtained through high-temperature calcination. The method adopted by the invention is simple and convenient in process and low in raw material cost, iron-based components such as Fe2O3 rich in the red mud can be efficiently activated, and in-situ doping and structure regulation and control of various metal elements are realized. The prepared red mud-based photoelectrode can be applied to the field of photoelectrocatalysis, including hydrogen production through water decomposition, biomass conversion, solid waste recycling and the like. According to the method, waste is treated with waste as the core, a new way is opened up for comprehensive utilization of the red mud solid waste, and the method has good application potential in the fields of environment and energy.

The invention discloses an electrochemical sensor detection device for heavy metal residues in star anise, and relates to the technical field of star anise detection.The electrochemical sensor detection device comprises an electrochemical sensor detection device body, T-shaped grooves are formed in the positions, close to the left side and the right side, of the rear side of the electrochemical sensor detection device body, and T-shaped blocks are movably connected into the T-shaped grooves; through mutual cooperation of an electrochemical sensor detection device body, a motor, a safe acid adding bottle, a connecting cylinder and other structures, a small amount of star anise can be placed in the connecting cylinder, the motor cooperates with a crushing rod to crush the star anise, and then one-time use amount of acid in the safe acid adding bottle is poured into the connecting cylinder; according to the invention, star anise powder is subjected to acid digestion, then ultrapure water is added, a filter disc filters liquid in a connecting cylinder, then the connecting cylinder is moved, a liquid sample flows into an electrochemical sensor detection device body, and the electrochemical sensor detection device body detects the liquid sample.

Improved methods for the removal of heavy metals, in particular cadmium, from an aqueous phosphoric acid containing composition, using an organothiophosphorous heavy metal precipitating agent to said composition, wherein the reaction between the heavy metals, in particular cadmium, and the organothiophosphorous precipitating agent is performed at a pH ranging between 1.6 and 2.0 measured after a 13-fold dilution by volume. Advantageously, an ionic polymer, particularly a cationic and / or an anionic poly(meth)acrylamide copolymer may be used to promote heavy metal precipitation and / or to facilitate the removal of the precipitates from the composition. More in particular, the phosphoric acid containing composition is obtained by the acid digestion of phosphate rock, preferably by nitric acid, sulfuric acid, or a combination thereof.

The present disclosure provides improved methods for the removal of heavy metals, in particular cadmium, from an aqueous phosphoric acid containing composition, wherein an ionic polymeric flocculating agent is added to a phosphoric acid containing composition subsequent to the addition of an organothiophosphorous heavy metal precipitating agent to said composition, particularly under gentle mixing conditions, such as between 100 and 300 rpm. The flocculating agent promotes the formation of agglomerates of the heavy metal containing precipitate, thus facilitating their removal from the composition. More in particular, the phosphoric acid containing composition is obtained by the acid digestion of phosphate rock, preferably by nitric acid, sulfuric acid, or a combination thereof.

Improved methods for the removal of heavy metals, in particular cadmium, from an aqueous phosphoric acid containing composition, wherein an organothiophosphorous heavy metal precipitating agent and an ionic polymeric surfactant, particularly a cationic polyacrylamide copolymer surfactant, are both added to a phosphoric acid containing composition, particularly under vigorous mixing conditions, such as between 500 and 700 rpm. The ionic polymeric surfactant promotes the precipitation of the heavy metals. More in particular, the phosphoric acid containing composition is obtained by the acid digestion of phosphate rock, preferably by nitric acid, sulfuric acid, or a combination thereof.

The present invention provides a rapid method for wet digestion of high-phosphorus iron ore, which can quickly and accurately decompose high-phosphorus iron ore to meet the testing requirements of scientific research and industrial production for multi-element analysis of high-phosphorus iron ore. The present invention uses a mixed acid digestion method to decompose difficult-to-digest high-phosphorus iron ore, optimizes the addition ratio of each acid, determines the optimal decomposition conditions, and uses potassium dichromate titration and quinoline gravimetric method to respectively determine the iron and phosphorus content in the high-phosphorus iron ore. At the same time, the ICP standard curve method is used to analyze the content of impurity elements in the ore. Experimental results show that the sample is completely decomposed and the measurement results are reliable. This method is fast, convenient, and has good reproducibility, providing an accurate and rapid method for daily batch analysis of high-phosphorus iron ore.

The invention discloses a method for detecting the content of a zirconium element in high-purity quartz sand, which comprises the following steps: heating and digesting the high-purity quartz sand by using an acid digestion solution in a closed environment, and evaporating a solvent to dryness after the digestion is completed to obtain a residue; transferring the residues into a heat-resistant container by using nitric acid, evaporating the solvent to dryness, then adding strong base, and heating to carry out alkali dissolution reaction; the alkali dissolution reaction comprises the following steps: heating to 200-300 DEG C, preserving heat for a period of time, heating to 550-950 DEG C, and preserving heat for a period of time; cooling after the alkali dissolution reaction is finished, dissolving an alkali dissolution reaction product with nitric acid, and fixing the volume with pure water to obtain a sample solution; preparing a standard impurity solution and a blank sample solution; the sample solution, the standard impurity solution and the blank sample solution are tested and analyzed through ICP-OES or ICP-MS, and the content of the zirconium element in the high-purity quartz sand is obtained.

This invention relates to the field of cultural relic testing technology. It discloses a microwave-assisted digestion method for strontium isotope detection in silkworm cocoons, comprising: 1) impurity removal and degumming; 2) pulverization and acid digestion; 3) microwave-assisted digestion; 4) column packing; and 5) separation of strontium from other ions via an exchange column and enrichment of the strontium isotope content in the sample. This invention uses a combination of perchloric acid and hydrogen peroxide to digest organic matter in silkworm cocoons, which can completely digest the cocoon shell powder in a short time without contaminating the sample, thus facilitating strontium isotope detection. This invention uses microwave heating and strong acid to digest the sample, offering advantages such as rapid sample dissolution under high temperature and pressure, and low sample loss. This invention uses hydrochloric acid as the eluent, and Dowex 50W×8 cation exchange resin for initial separation of strontium from other ions. Acetic acid is used as the eluent, and Sr-Spec resin, a strontium-specific resin, is used to further separate and enrich the strontium isotope content in the sample.

The present application relates to a kind of determination methods of cesium content in all-inorganic perovskite CsPbX3, belong to inorganic perovskite battery technical field.The test method includes ① with mixed acid digestion sample;② adding sulfuric acid precipitates lead matrix;③ adding rubidium salt and sensitizer improves the degree of atomization of cesium;④ atomic absorption spectrometry draws standard curve;⑤ the content of cesium element is determined.The present application mainly solves the problem of the determination of cesium content in inorganic perovskite CsPbX3, with good precision, high accuracy, wide concentration range, low analysis cost, the advantages such as simple and fast operation, effectively fill the blank of inorganic perovskite battery chemical analysis method.Can be used as the determination method of cesium content in inorganic perovskite CsPbX3.

The invention relates to the technical field of environmental analysis, in particular to a method for analyzing atmospheric particulates by an inductively coupled plasma mass spectrometer, which comprises the following steps: S1, collecting an atmospheric particulate sample; s2, carrying out bionic molecular imprinting enrichment; s3, carrying out plasma derivatization; s4, carrying out thermal desorption-ion transmission; s5, ICP-MS detection is carried out; s6, double internal standard calibration quantification; and S7, performing form quantitative analysis. According to the method, the target form is accurately captured through the molecularly imprinted microspheres, and organic metal degradation caused by acid digestion is avoided; the plasma derivatization completes a complexation reaction at low temperature, so that the original form information is effectively reserved; the boron carbide coating transmission system significantly reduces the adsorption loss of trace elements; and a double-internal-standard dynamic calibration strategy is combined, so that the detection stability and accuracy are greatly improved.

The application discloses a kind of based on organic matter interference evaluation cadmium isotope standard substance stability verification method, belongs to environmental monitoring and geology reference material analysis technical field, the method first from the mixed to be evaluated Cd standard reference material large sample Randomly equal amount takes two samples;Two samples are respectively subjected to acid digestion and Cd separation and purification, then MC-ICP-MS measurement is carried out, obtains the δ 114 / 110 Cd value of each sample;Finally, the difference of the δ 114 / 110 Cd value of two samples is calculated and compared with threshold value to judge the homogeneity and stability of the Cd isotope composition of the standard substance, and the effectiveness of the method is verified by the fact that the measurement results of the control sample are within the known demonstration interval. The verification method directly separates the sample when taking the solid powder sample, classifies and evaluates it based on its inherent physical and chemical properties, and provides a reliable reference standard substance screening method for Cd isotope research of environmental samples.

The invention discloses a method for detecting ruthenium and ruthenium oxide in a high-level liquid waste glass solidified body, and belongs to the technical field of glass solidified body detection. The method comprises the following steps: firstly, mixing basic glass powder with simple substance ruthenium and ruthenium oxide to prepare a series of standard samples, then carrying out acid digestion and then filtering to remove high-content components such as substrate silicon dioxide and sodium oxide, so that the simple substance ruthenium and the ruthenium oxide are left on a filter membrane; the method comprises the following steps: measuring diffraction spectrograms of ruthenium and ruthenium oxide on a filter membrane by adopting an X-ray diffractometer, drawing a standard working curve according to the integral intensity of a main strong diffraction peak of elemental ruthenium and the integral intensity of a secondary strong diffraction peak of ruthenium oxide, and then carrying out the same treatment on a to-be-measured glass solidified body sample to obtain the corresponding integral intensity. The method disclosed by the invention is simple, the synchronous distinguishing detection of the simple substance ruthenium and the ruthenium oxide can be realized, and the detection precision is high.

The invention discloses a pretreatment method for detecting metal impurities in an electronic-grade triethyl phosphate precursor. The pretreatment method comprises a sample pretreatment and sample preparation stage, a vacuum volatilization stage, a concentrated acid digestion stage, a dilution and constant volume stage and a computer testing stage. According to the method, the boiling point of the sample is reduced by adopting a negative pressure (vacuumizing) condition along with volatilization (heating by a heating plate) mode, so that the purpose of complete volatilization is achieved, the influence of overhigh concentration of a sample substrate on other metal ions is reduced, and the problems of difficult volatilization and unstable process in pretreatment of metal ions with high boiling point and high substrate substances are solved.

The invention relates to a library construction method suitable for a Pacbio platform. The library construction method comprises the following steps: repairing a nucleic acid sample to be detected; the repair treatment product is connected with a connector, connection treatment is conducted, and the repair treatment product does not contain A tail; carrying out digestion treatment on a joint connection product; wherein purification treatment is not included between the repair treatment and the digestion treatment. According to the library building method provided by the embodiment of the invention, purification is not needed before nucleic acid digestion treatment is completed, library building can be completed under a single reaction system, reagent and sample loss caused by replacement of the reaction system is reduced, and the library yield is increased; the A tail adding operation in the library building process is omitted, the operation process is simplified, the library yield is increased, the library quality is good, and the library building cost is remarkably reduced.

The invention discloses a method for evaluating acidolysis settling performance of titanium concentrate. The method comprises the following steps: carrying out ball milling on the titanium concentrate with first mass to obtain titanium concentrate powder with second mass; sieving the second mass of titanium concentrate powder to obtain third mass of titanium concentrate powder; the titanium concentrate powder with the third mass is dissolved in water, and mineral powder with the fourth mass floating on the water surface is collected; the scheme provided by the invention is suitable for the field of sulfuric acid process titanium dioxide production, and simple and rapid experiments on the titanium concentrate are realized, so that the quality of the titanium concentrate in the sedimentation process of sulfuric acid process titanium dioxide production is predicted; and concentrated sulfuric acid does not need to be used for complete titanium concentrate acidolysis, leaching and flocculating settling experiments, so that accurate raw material entering quality control is realized, the production risk is avoided from the source, the production stability is improved, and the comprehensive cost is reduced.

The technical scheme of the invention discloses an analysis method for determining nickel isotope in a geological sample. In an alkaline medium of ammonia water, most metal elements easily form hydroxide precipitates, when the ammonia water and a rock sample solution generated through acid digestion are subjected to a co-precipitation reaction, most matrix elements (Mg, Al, Ca, Ti, V, Cr, Mn, Fe and Sn) form precipitates, but the solubility of nickel hydroxides in the ammonia water is relatively high, and especially in the presence of excessive ammonia, the nickel hydroxides in the rock sample solution have relatively high solubility. A soluble ammonia complex [Ni (NH3) 6] < 2 + > can be formed, so that separation is realized. According to the method, nickel double diluents are added during early-stage sample treatment, and a sample and standard sample intercalation method is combined in a testing process, so that isotope fractionation of nickel in a chemical treatment process and an analysis process when excessive ammonia water is used for coprecipitating nickel isotopes can be effectively corrected; the bottleneck that the nickel isotope cannot be detected by using an ammonia water coprecipitation method in the traditional technology is solved.

A method for producing high purity carbon nanotube (CNT) materials, in some cases such that they contain no more than 10,000 ppm total residual catalyst and residual metal, and in some cases no more than 1,000 ppm of such contaminants. The method includes providing starting CNT material from a CNT synthesis process wherein CNTs are grown on supported active metal catalyst, performing a thermal oxidation treatment on the starting CNT material in a furnace under a controlled atmosphere in a temperature range and for at least a minimum time, to produce an oxidized CNT material wherein metals are oxidized, and performing an acid digestion treatment on the oxidized CNT material using a defined acid and for at least a minimum time, to dissolve oxidized metals and produce the high purity CNT material.

This invention discloses a method for determining the phosphate oxygen isotopes of a single dentomorph based on ion chromatography-electrostatic orbital trap mass spectrometry, belonging to the field of isotope geochemical analysis technology. The method includes: acid digestion step; lyophilization step; reconstitution step; ion chromatography separation and fraction collection step; mass spectrometry analysis step: acquiring the mass spectrometric signals of the target fragment ions; isotope ratio calculation step: calculating the oxygen isotope shift of the sample relative to the reference solution; and calibration step: establishing a calibration curve using multiple known phosphate reference materials to obtain the phosphate oxygen isotope composition of the sample. This invention simultaneously solves three technical bottlenecks in existing thermal conversion elemental analysis-isotope ratio mass spectrometry methods: high sample consumption and cumbersome procedures prone to fractionation; secondary ion mass spectrometry methods: mixed signals and inability to distinguish different oxygen-containing components; and pure solution electrostatic orbital trap mass spectrometry methods: lack of solid sample pretreatment support.

Methods of processing magnesium silicate materials are described to produce a number of products including magnesium hydroxide. Related methods of use of processed magnesium silicate and other reaction products are described for energy production, cement manufacture and carbon sequestration. In one embodiment the method comprises subjecting a magnesium silicate source to an acid digestion; increasing the digested liquid pH to produce a magnesium salt solution; subjecting the magnesium salt solution to electrolysis; and recovering magnesium hydroxide produced from electrolysis. By-products such as silica, iron oxy(oxides) and others are also described along with further reaction products such as magnesium oxide and magnesium carbonate.

Improved methods for the removal of heavy metals, in particular cadmium, from an aqueous phosphoric acid containing composition, wherein an ionic polymeric flocculating agent is added to a phosphoric acid containing composition subsequent to the addition of an organothiophosphorous heavy metal precipitating agent to said composition, particularly under gentle mixing conditions, such as between 100 and 300 rpm. The flocculating agent promotes the formation of agglomerates of the heavy metal containing precipitate, thus facilitating their removal from the composition. More in particular, the phosphoric acid containing composition is obtained by the acid digestion of phosphate rock, preferably by nitric acid, sulfuric acid, or a combination thereof.

1. Name of the designed product: Digestion tube. 2. Use of the designed product: For acid digestion of samples. 3. Design points of the designed product: In shape. 4. Picture or photo that best shows the design points: Perspective view.

The invention discloses an integrated cartilage decellularization kit and a decellularization method thereof, and belongs to the technical field of biomedicine. The kit comprises an independently packaged ready-to-use tissue lysis buffer solution and nucleic acid digestive enzyme dry powder mixture, the pH value of the ready-to-use tissue lysis buffer solution is 7.4-7.6, and every 100 mL of the ready-to-use tissue lysis buffer solution contains 0.9 g of sodium chloride, 0.05-0.2 g of sodium deoxycholate monohydrate, 0.05-0.2 g of calcium chloride dihydrate, 0.05-0.2 g of magnesium chloride hexahydrate and 0.4-0.6 mL of a surfactant. The nucleic acid digestive enzyme dry powder mixture is a mixture of DNase I dry powder and RNase A dry powder, and the mass ratio of the DNase I dry powder to the RNase A dry powder is 1: (0.4-0.6). The invention further discloses a decellularization method adopting the integrated cartilage decellularization kit. According to the invention, the decellularized cartilage scaffold which has low immunogenicity and highly retains natural extracellular matrix structure and biochemical composition can be stably prepared.