19 results about "Microwave digestion" patented technology

This invention discloses a method for dissolving NiCrPSi nickel alloy samples for ICP-OES detection, comprising the following steps: mixing the NiCrPSi nickel alloy sample to be tested with hydrochloric acid aqueous solution, concentrated nitric acid, and hydrofluoric acid aqueous solution, digesting at 120-140℃ for 1.5-2.5h, and then evaporating the solution to dryness at 220-260℃; then adding nitric acid aqueous solution and heating until the solid is completely dissolved, and then diluting with water to obtain the NiCrPSi nickel alloy test solution. The dissolution method of this invention can completely dissolve NiCrPSi nickel alloy powder without elemental loss, providing an accurate sample solution for ICP-OES detection; and it eliminates the need for specialized equipment such as microwave digesters or electrothermal digesters, as well as special reagents such as perchloric acid and tartaric acid, using only conventional acid reagents and general experimental equipment, thus reducing costs, simplifying operation, and enhancing versatility.

This invention discloses a method for determining the content and simultaneously identifying the source of polyglutamic acid (PCA) in fertilizers based on microwave digestion-high-resolution liquid chromatography-mass spectrometry (LC-MS), belonging to the field of analytical detection technology. The method includes: microwave-assisted acid hydrolysis of fertilizer samples to obtain a hydrolysate; injecting the hydrolysate into a liquid chromatography-high-resolution mass spectrometry (LC-MS) instrument, performing a single injection analysis in data-independent acquisition (DIA) mode, and simultaneously acquiring a mass spectrometry dataset containing a full-scan fingerprint of the parent ion and fragment information of the daughter ion by alternating between low and high collision energies; extracting the precise mass number of PCA from the dataset for accurate quantification, and calculating the PCA content using the difference method; simultaneously retrieving the total ion chromatogram and inferring the source of PCA based on the response of other amino acids. This invention is the first to introduce microwave digestion pretreatment and high-resolution mass spectrometry DIA acquisition mode into the field of PCA detection in fertilizers, requiring only a single injection to simultaneously complete accurate quantification and source identification, effectively avoiding false positives caused by background of plant and animal protein hydrolysates, and significantly improving the efficiency and confidence of PCA detection in complex matrix fertilizers.

The utility model relates to experimental apparatus technical field, concretely relates to a microwave digestion appearance of quick sample taking and placing, including host computer and hinged setting in the sealed cover of host computer top surface, the host computer includes heat -proof shell and the microwave generating device of fixed mounting in heat -proof shell inner wall, the heat -proof shell top surface has the opening, the heat -proof shell is installed with lifting digestion jar device.

The application relates to a microwave digestion instrument for pesticide sample pretreatment and relates to the technical field of pesticide residue detection. The microwave digestion instrument comprises a shell, the bottom of the shell is fixedly connected with a device seat, the top of the shell is provided with a controller, the outside of the shell is provided with a protection mechanism, the inside of the shell is provided with a heating mechanism, the outside of the device seat is provided with a dissipation mechanism, the protection mechanism comprises a rotating seat, the outside of the rotating seat is fixedly connected to the right side of the outside of the shell, the outside of the rotating seat is rotationally connected with an inner door, the outside of the inner door is fixedly connected with a pressing part, the left side of the outside of the shell is fixedly connected with an opening and closing seat, and the outside of the opening and closing seat is rotationally connected with an outer door. The application has the advantages that the inner door is driven to rotate through the rotating seat, the outer door is driven to rotate through the opening and closing seat, one side of the pressing part is supported on the outside of the shell, and the other side of the pressing part is supported on the outer door, so that the inner door and the outer door are tightly combined with the shell, and the sealing effect is improved.

The utility model relates to the technical field of microwave digestion equipment, concretely is a kind of molybdenum ore microwave digestion appearance, the upper end of lower connecting disc is rotatably connected with carousel main body, the upper wall of carousel main body is equipped with multiple groups of movable passageway, the inner wall of movable passageway of each group is slidably connected with connecting sliding block main body, and one end opening of movable passageway is fixedly connected with fixed block, the upper wall of fixed block is fixedly connected with installation cylinder, installation cylinder is used to install digestion tank, one end of fixed block is rotatably connected with threaded rod, the outer wall of threaded rod is screw-connected with sliding block main body, after digestion operation ends, the digestion tank needed to be taken out is rotated to the export by carousel main body, servo motor is opened, threaded rod is rotated by servo motor, sliding block main body is moved in the inner wall of movable passageway, the digestion tank to be taken out is moved to the export by installation cylinder, it is extremely convenient to take out, avoid mutual collision.

The application discloses a method for determining the content of yttrium in slag by high-pressure closed digestion-inductively coupled plasma mass spectrometry, wherein a sample is placed in a microwave digestion tank, nitric acid and hydrofluoric acid are added, and after the reaction is calm, the digestion tank is cooled to room temperature for 5-10 minutes, a sealing cover is covered, the tank is loaded into an outer digestion tank, and then loaded into a protective cup and a digestion rotor; after the air is released by screwing a screw rod, the tank is loaded into a microwave digestion instrument, reaction conditions are set, and microwave digestion is carried out; after the digestion is completed, the digestion tank is taken out, and the digestion liquid is transferred out for determination. The application aims to provide a method for determining the content of yttrium in slag by high-pressure closed digestion-inductively coupled plasma mass spectrometry, and ensures the accuracy of final detection.

This utility model discloses a microwave digester for solid waste, relating to the field of microwave digester technology. The utility model includes a digester housing, with a baffle slidably connected inside the housing. A motor is fixedly connected to the left side of the housing, and a threaded rod is fixedly connected to the motor output end via a coupling. This utility model utilizes a moving block; specifically, pulling the baffle upwards connects the cleaning groove with the interior of the digester, simultaneously removing any restrictions on the moving block's position. The motor then starts, driving the threaded rod to rotate, which in turn moves the moving block to the right. This movement of the moving block simultaneously moves the cleaning block, cleaning residue from the top of the strainer, ensuring the cleanliness of the device's interior, preventing corrosion, and extending the instrument's lifespan.

The present application relates to a kind of feed additive component detection device and detection method;The feed additive component detection device includes the following equipment optimized by parameter: muffle furnace, microwave digestion instrument, high-speed centrifuge, ultrasonic extraction instrument, electronic balance, with online enrichment liquid chromatograph, liquid chromatography-tandem mass spectrometer, atomic absorption spectrometer, near infrared spectrometer, laser particle size analyzer, inductively coupled plasma mass spectrometer, microbiological incubator, colony counter, portable near infrared spectrometer, portable liquid chromatograph, portable enzyme label instrument, sample pretreatment is carried out by above-mentioned equipment, multiple components are synchronously detected, detection precision control, trace component detection, new additive detection and on-site rapid detection, compared with prior art, the present application is accurate and efficient, can multiple components be synchronously detected, while detection precision is significantly improved, can be suitable for new additive high-precision detection.

The application discloses a detection method for heavy metal content in different edible parts of common vegetables and fruits, which comprises the following steps: (1) cleaning dirt on the surface of the vegetables and fruits by using a cleaning device; (2) selecting different edible parts of the vegetables and fruits, and respectively preparing sample solutions by using a microwave digestion method, and meanwhile, carrying out a blank test; (3) injecting the sample solutions into an inductively coupled plasma mass spectrometer, measuring signal response values of the to-be-detected elements and internal standard elements, taking the concentration of the to-be-detected elements as the abscissa, taking the ratio of the response signal values of the to-be-detected elements and the selected internal standard elements as the ordinate, and drawing a standard curve; (4) injecting the blank solution and the sample solution into the inductively coupled plasma mass spectrometer respectively, measuring signal response values of the to-be-detected elements and the internal standard elements, and obtaining the concentration of the to-be-detected elements in the digestion solution according to the standard curve; and (5) calculating the analysis result.

The application provides a testing method of the content of alkali metal elements in a binder, comprising the following steps: 1) sequentially performing dry ashing treatment, pre-digestion treatment and microwave digestion treatment on the binder to obtain a digestion solution; the binder comprises alkali metal elements, and the alkali metal elements comprise sodium elements and / or lithium elements; the temperature of the microwave digestion treatment is higher than that of the pre-digestion treatment; 2) testing the peak intensity of the alkali metal elements in the digestion solution by using an inductively coupled plasma emission spectrometer; 3) drawing a standard curve based on an external standard method, and calculating the content of the alkali metal elements in the binder according to the peak intensity of the alkali metal elements in the digestion solution based on the standard curve. The testing method of the content of alkali metal elements in the binder provided by the application can improve the accuracy of the testing result, since the pretreatment process comprises dry ashing treatment, pre-digestion treatment and microwave digestion treatment in sequence.

This invention provides a method and system for the supermicrowave digestion and determination of thallium in ores. Based on X-ray fluorescence spectroscopy, the matrix insolubility index is calculated to establish the digestion decision variables. Redundant points are eliminated using Sobol sequences combined with Thiessen polygons, and a non-uniform experimental design is constructed to obtain training data. On this basis, a hybrid response surface model is constructed, and kernel partial least squares regression is applied to fit the main trend, Gaussian process regression is used to process the residuals, and the interference index is introduced as a hyperparameter. The Grey Wolf optimization algorithm, incorporating Lévy flight, is used to optimize the ore while ensuring low residual organic carbon and maximizing the recovery rate. The obtained optimal parameters are used for supermicrowave digestion of the ore, and the thallium content is determined by ICP-MS, achieving efficient and accurate detection.

This invention discloses a microwave digestion ICP-MS pretreatment method for improving the accuracy of mercury detection in cosmetics, belonging to the field of analytical chemistry. The method includes: microwave digestion of the sample using nitric acid, hydrogen peroxide, and hydrochloric acid to obtain a digestion solution; diluting and adjusting the volume of the digestion solution to obtain a sample solution; preparing a standard solution; setting the instrument parameters; and then performing sample analysis. This method is simple to operate. By adding hydrochloric acid, a stable HgCl complex is formed to inhibit mercury loss, solving the technical problems of conventional gold amalgam methods failing in certain complex matrices and low recovery rates without stabilizers. This invention ensures accurate quantification of mercury while not affecting the simultaneous determination of lead, arsenic, cadmium, chromium, and antimony, making it suitable for the safety testing of various cosmetics.

The application discloses a measurement method and system for heavy metal content of Chinese traditional medicine herba potentillae discoloris, and the measurement method comprises the following steps: pretreating the Chinese traditional medicine herba potentillae discoloris, and realizing effective enrichment and preliminary purification of target heavy metal ions in the herba potentillae discoloris by using a microwave digestion-turbid point extraction technology; determining optimal spectral experimental parameters of inductively coupled plasma atomic emission spectrometry by using a response surface method; investigating and eliminating ion interference and acid interference generated after microwave digestion-turbid point extraction of the herba potentillae discoloris sample; after removing the interference of the herba potentillae discoloris sample solution obtained by using the microwave digestion-turbid point extraction technology, the inductively coupled plasma atomic emission spectrometry is used to determine the target heavy metal content in the herba potentillae discoloris; and the accuracy of the metal content determination method is verified according to the Chinese Pharmacopoeia. The application improves the sensitivity and accuracy of the heavy metal content analysis method of the Chinese traditional medicine.

The present application relates to a kind of detection methods for residual amount of dibutyl tin diacetate in silica gel adhesive, comprising the following steps: S1, instrument preparation: ICP-MS;S2, preparation of test solution, according to GB / T16886.18-2022, different solvents are selected as leaching solvent, and parallel sample is prepared by adding strict leaching, and corresponding solvent is used as blank, the leaching solution is placed in microwave digestion tank, the solvent is evaporated to dryness, nitric acid is added, and the program is digested, after digestion, it is evaporated to nearly dry, and it is constant volume with nitric acid, and the same method is used to prepare blank control solution without sample, the present application uses microwave digestion pretreatment mode, which can effectively decompose the complex matrix of silica gel adhesive and improve the release efficiency of organotin;The tin element is detected by ICP-MS, which has the advantages of high sensitivity and low detection limit;Through element content conversion, quantitative analysis of dibutyl tin diacetate is realized, and the matrix interference problem caused by direct detection of organotin is avoided;The method has good repeatability, and is suitable for daily quality control and detection analysis of silica gel adhesive product.

The application discloses a method for simultaneously determining contents of multiple trace rare earth elements in samples based on IC-ICP-MS combination, and the method is characterized in that: solid samples are converted into liquid samples suitable for sample introduction through acid dissolution and microwave digestion, rare earth elements in the samples are released into the solution, and then different rare earth elements are separated in the time dimension through chromatographic separation, so that mass spectrum interference is avoided from the source, and the selectivity, accuracy and reliability of ICP-MS analysis are favorable, and the method can be used for detecting contents of multiple trace rare earth elements in various types of samples. The method can not only eliminate interference of multiple atoms such as isobaric elements and oxides, remove matrix effects, and obtain a lower detection limit, but also detect different valence states of the rare earth elements.

The application discloses a method for determining silicon element in glass by ICP-MS CRC technology, which comprises four steps of sample pretreatment, instrument condition optimization, interference elimination verification and quantitative analysis: the glass sample is treated by a microwave digestion method or a melting method to avoid the introduction of interference by a chlorine-containing reagent; ICP-MS CRC reaction cell conditions are optimized, O2 or H2 is selected as a reaction gas, the flow rate is set to 0.3-0.7 ml / min, the cell pressure is set to 1.0-1.5 mbar, and 29Si+ is selected as a monitoring ion; the interference elimination effect is verified by a full scanning mode and a standard solution; and a standard curve is drawn and the silicon concentration is calculated. By using the method, the interference of polyatomic ions is effectively eliminated, the silicon detection limit is as low as 0.1 ppb, the detection accuracy is improved by more than 90%, and the method has the advantages of wide applicability, simple operation and reliable data, and can be used for accurate detection of trace silicon in glass and semiconductor material complex matrix samples.

The application discloses a precision detection method for volatile heavy metal elements in metallurgical residual activated sludge, and belongs to the technical field of environmental monitoring and chemical analysis. The application optimizes a "HNO3-H2O2-HF" composite acid system combined with gradient temperature microwave digestion, can effectively destroy the complex mineral lattice of metallurgical sludge, release the wrapped heavy metals, ensure that the extraction rate is greater than 95%, and the result is closer to the true value. The addition of L-cysteine complex significantly improves the element stability, improves the atomization stability in ICP-MS, and reduces the memory effect. The microwave digestion is selected, the sample is subjected to in a closed system, the acid consumption is small, the waste gas emission is small, the use and exposure risk of HF are reduced. Subsequent low-temperature driving of hydrofluoric acid effectively reduces the volatilization of trace elements, and L-cysteine is used to protect the volatile elements, and the stability in the subsequent transfer, storage and detection process.

This method discloses an analytical chemistry technique for determining multiple metal elements in baijiu (Chinese liquor) using ICP-MS. The core of this method is an integrated pretreatment process combining low-temperature alcohol removal and microwave digestion. Chloroauric acid is added to stabilize mercury, and a low temperature of 90℃ is used to reduce the loss of volatile elements. The entire process—alcohol removal, digestion, and acid removal—is completed within the same microwave digestion vessel, minimizing contamination and loss. Combined with simultaneous multi-element detection by ICP-MS, it can simultaneously determine 18 metal elements, including Se, Ge, Hg, Pb, Cd, and As. This method features simple pretreatment, high sensitivity, good accuracy, and excellent linearity, making it suitable for the rapid and accurate determination of trace and ultra-trace metal elements in various types of baijiu, providing reliable technical support for baijiu quality control and food safety supervision.

This invention provides a sample preparation method for silicon nitride analysis using ICP-OES. The microwave digestion method includes the following steps: (1) mixing silicon nitride with a composite acid solution to obtain a mixture; (2) subjecting the mixture to microwave digestion and then adjusting the volume to obtain a sample preparation solution; wherein the composite acid solution includes concentrated nitric acid, hydrofluoric acid, and concentrated sulfuric acid. The sample preparation method of this invention can fully dissolve silicon nitride, thereby enabling the simultaneous testing of Si and impurity elements in silicon nitride ceramic materials.