64 results about "Wet digestion" patented technology

The invention provides a sample digestion processing device, which comprises a frame, a heater and a solvent supply mechanism, wherein the heater is provided with more than one test tube accommodating hole; test tubes can be arranged in the test tube accommodating holes; the solvent supply mechanism is provided with a feeding nozzle which is arranged above the heater, can move transversely and/orlongitudinally in the horizontal plane, and is connected with a solvent storage chamber; and the heater and the solvent supply mechanism are respectively arranged on the frame; a test tube bracket isarranged on the heater; through holes corresponding to the test tube accommodating holes of the heater is formed on the test tube bracket; the heater comprises a heat-insulating tank body, and a heatconducting body arranged in the heat-insulating tank body; the test tube accommodating holes are formed on the heat conducting body; and the test tubes are arranged in the test tube bracket and the test tube accommodating holes. In the sample digestion processing device, the solvent is fed by the solvent supply mechanism, the sample is digested not by a manual wet digestion method, and the devicecan realize the quick digestion processing of quantitative solvents and samples added into the test tubes.

The invention discloses a method for analyzing arsenic content in a glass refining agent, which comprises the following steps: processing samples by a potassium permanganate preoxidation-hydrofluoric acid wet digestion method to obtain a sample digestion solution; measuring the content of arsenic in the digestion solution by an inductance coupling plasma atomic emission spectrometry. By using potassium permanganate as a pre-oxidizing agent to carry out routine wet acid digestion on glass refining agent samples, the method can effectively avoid volatilizable loss of low-valent arsenic components in the preliminary processing of the samples, therefore, a routine inductance coupling plasma atomic emission spectrometer can be used to directly measure the content of the effective content-arsenic in the glass refining agent without allocating a hydride generator or an atomic fluorescence spectrometer. The method has the advantages of high operability, high analysis speed, high accuracy and favorable sensitivity and repetitiveness.

The invention discloses a method for efficiently measuring the content of Cu, Fe, Mn and Ca in cereal food. The method comprises the following steps: digesting a sample, drawing a standard curve, measuring the sample, weighing 2.000 g of the sample, adding 20 mL of a nitric acid and perchloric acid mixing solution to perform wet digestion, wherein the volume ratio of nitric acid and perchloric acid is 4:1; under the best working condition selected for an instrument, measuring the absorbance of a standard series of solutions, taking the concentrations of elements as an x-coordinate, wherein the absorbance is a y-coordinate, and drawing a standard curve; keeping a favorable linear relation between the mass concentrations of Cu, Fe, Mn and Ca and the absorbance, wherein the mass concentration ranges of Cu, Fe, Mn and Ca are respectively 0.2-2.0 mg/L, 0.5-6.0 mg/L, 0.5-4.0 mg/L, and 2.0-10.0 mg/L, the correlation coefficients r of Cu, Fe, Mn and Ca are 0.9990, 0.9980, 0.9985 and 0.9999. The method has the advantages of being capable of continuously measuring the content of Cu, Fe, Mn and Ca, accurate, fast, stable, simple and convenient.

The invention discloses a nitrogen blowing instrument. The nitrogen blowing instrument comprises a bracket, a shell on which a pipeline is placed, a blowing needle and a heating device, wherein the shell with the pipeline is fixed on the upper part of the bracket, the heating device is fixed at the lower part of the bracket, the lower surface of the shell with the pipeline is provided with the detachable blowing needle, the blowing needle is connected with the pipeline, and the pipeline and the blowing needle are made from polytetrafluoroethylene and copolymer thereof. The invention further discloses a wet digestion method using the nitrogen blowing instrument. The method comprises the following steps: 1) placing a sample and a reaction reagent in a digestion cup; 2) placing the digestion cup on the heating device of the nitrogen blowing instrument; 3) placing the blowing needle of the nitrogen blowing instrument in the digestion cup and introducing a protection gas; and 4) setting or changing the heating temperature of the heating device according to a preset digestion temperature according to the types of the sample and the reaction reagent. The nitrogen blowing instrument disclosed by the invention is simple in structure, and is capable of effectively preventing explosion when applied to wet digestion, the security of the operation is improved, the secondary pollution of metal can be effectively avoided, and the accuracy of the detection result is guaranteed.

The invention relates to a method for measuring the sulfur content of steppe plant. The method comprises the specific processes of a, collecting a steppe plant sample; b, treating the sample: b1, cleaning, b2, drying, b3, grinding and b4, smashing; c, measuring the sulfur content of the plant: performing measurement by an acidic wet digestion-barium sulfate turbidimetry, putting the plant sample under the action of a catalyst and an oxidant to oxidize organic sulfur until all sulfurs in the plant are converted into sulfates, then adding a quantitative amount of acid and a turbidity agent to generate barium sulfate suspension, and performing turbidimetry measurement at the wavelength of 440nm; and d, analyzing according to a sulfur content measurement result of the plant. According to the method for measuring the sulfur content of the steppe plant, the sulfur content of the whole plants in dominant species/subdominant species can be measured.

The present invention discloses a method for determining lead, cadmium, chromium and mercury in a plastic through EDTA-2Na complexation digestion. The method comprises: 1, preparing a detected sample, wherein EDTA-2Na is added to a sample solution and volume metering is performed to obtain the sample to be detected; 2, drawing a standard work curve, wherein prepared standard solutions with different concentrations are sequentially placed into an inductively coupled plasma atomic emission spectrometer, the standard work curve is drawn, and the corresponding linear regression equation is obtained according to the standard work curve; and 3, determining the detected sample, wherein the sample to be detected and obtained in the step 1 is tested, and the lead content, the cadmium content, the chromium content and the mercury content in the sample are calculated according to the linear regression equation. According to the present invention, with the EDTA-2Na complexation digestion method, the problem that the traditional wet digestion method can not determine the lead and the mercury in the plastic is solved; and with the method, the total content of the four elements such as lead, cadmium, chromium and mercury can be simultaneously and accurately determined, the detection accuracy and the detection precision can meet the detection requirements of the RoHS command, and the analysis results are effective and reliable.

The invention discloses a method for rapid determination of the selenium content in tetrastigmatis hemsleyani, wherein a microwave digestion-hydride generation-atomic fluorescence spectrometry method is adopted for determination of the selenium content. With microwave digestion, the digestion efficiency is high and fast, moreover, acid removing is not required after digestion, operation steps are simplified, pollution is reduced, the accuracy rate is increased, disadvantages of easy pollution of wet digestion and long digestion time are avoided, acid removing is not required, concentrated hydrochloric acid is directly added for reduction of selenium, and the digestion procedures are simplified; the detection cycle is greatly shortened, and the original detection cycle of 8-10 hours is shortened to 2-3 hours; and the detection is rapid and accurate, and the operation is simple.

The invention relates to a method for measuring the rhodium content in rhodium-containing compound. The method comprises the steps of: 1) roasting by using high-temperature air to decompose rhodium-containing compound to be rough rhodium oxide; 2) grinding the rough rhodium oxide, immersing with 1-6mol/L hydrochloric acid for 1-5h at 50-70 DEG C and filtering to obtain filter residue; 3) reducing the filter residue with high-temperature nitrogen to change the rhodium oxide into rhodium powder; 4) weighing the rhodium powder and calculating rhodium content in the rhodium-containing compound. By adopting the method, rhodium content in the rhodium-containing compound with regular rhodium content which can be decomposed to be oxide by heating can be accurately measured, addition of other reagents for separation of rhodium is not needed, measuring error caused by repeated dilution with a power-spectral method is avoided, and rigorous requirements of high-temperature and strong-oxidizing-property wet digestion on the equipment are avoided. The method is convenient to operate without introducing solid impurities and has the advantages of high accuracy and recovery rate.

The invention discloses a wet digestion apparatus for wide size range lime blocks. The apparatus comprises an inlet pipe, a feed liquor distributor, a net chain machine, a slaker, a filter screen, a flush water pump and a flooding nozzle; a net chain on the net chain machine moves at a certain speed, the inlet pipe above the net chain machine delivers lime blocks onto the net chain machine, digestion water above the net chain machine flows out through the feed liquor distributor and splashes down to uniformly wet the lime blocks, lime blocks begin to be digested and disintegrated, the flush water pump pumps out digestive slurries in the slaker, digested substances of the lime blocks are swashed by the flooding nozzle arranged at the end of the net chain machine to form a slurry which flows into the slaker, the slaker is provided with stirring vanes which continue digestion of lime, and the lime slurry overflows to downstream equipment through the filter screen and an overflow pipe. The apparatus provided in the invention can digest lime blocks, basically has no requirements for the particle size of lime blocks, enables total energy consumption to be low and has the advantages of good adaptability, high reliability and a long service life.

The invention relates to a method for determining content of arsenic pentoxide and arsenic trioxide. The method comprises crushing to-be-detected samples, extracting and separating the arsenic pentoxide in the samples in accordance with dissolvable differences of the arsenic pentoxide and the arsenic trioxide in ethanol, digesting the extract with acid, determining arsenic of the arsenic pentoxide with an inductively coupled plasma atomic emission spectrometer, determining total arsenic content with a wet digestion method, getting arsenic content of the arsenic trioxide by calculating difference between the total arsenic content and the arsenic content of the arsenic pentoxide, and obtaining contents of the arsenic pentoxide and the arsenic trioxide in the samples according to molecular weight conversion. The method is rapid and effective, and relatively high in selectivity. The invention provides a reliable and conveniently implemented method for respective determination of the content of the arsenic pentoxide and the arsenic trioxide.

The invention discloses a method of determining selenium shape of honey and fruit juice by solid phase extraction-atomic fluorescence spectrometry. The method comprises the following steps: separating organic selenium and inorganic selenium in honey or fruit juice under a condition of pH being 3 by means of an SCX solid phase extraction column; then adding a mixed acid to digest and separate to obtain an inorganic selenium extraction liquid; then determining the selenium element by means of atomic fluorescence spectrometry; determining the content of total selenium by means of wet digestion; and finally obtaining the content of the organic selenium by means of a minusing method. The method of determining the shape of selenium separates and determines inorganic selenium and organic selenium accurately and effectively by combining technologies of ionic adsorption exchange, acid digestion and atomic fluorescence spectrometry and the like. The method is simple, environmentally friendly and efficient, thereby providing a powerful technical support for evaluating the functionality and safety of selenium-enriched honey and juice.

The invention discloses a method for automatically and quickly digesting a food sample, and belongs to the technical field of physical and chemical inspection of food hygiene. According to the invention, a full-automatic graphite digestion instrument is adopted for digesting the food sample, a matched cover needs to cover a digestion tube in the digestion process, and 1/4-1/2 of the bottom of a digestion tube body is located in a graphite hole to be heated. The method overcomes defects of the existing food sample digestion methods, such as long time, easiness in pollution, inapplicability to determination of volatile elements such as arsenic, mercury, tin, selenium and the like of dry digestion, high consumption of acid, multiple types of acid, long digestion time, high blank value, high possibility of polluting the environment, inapplicability to determination of mercury and the like of wet digestion, and the risk of high-pressure tube explosion, small digestion sample amount, high labor intensity of tank screwing and cleaning and the like of microwave digestion.

The invention discloses a full-automatic inorganic sample pretreatment acid-removing constant volume reaching instrument which comprises an interface module used in combination with a single-mode microwave digestion instrument; a heating module used for heating according to set temperature after cleaning is completed; a cleaning module for cleaning a digestion tank placed in a cleaning position for three times; a nine-way valve module for directly adding an acid for digestion and reaching a constant volume; a three-axis module used to suck, from a sample sending position, a solution in the digestion tank to put into a sample bottle placed in the heating module and move the digestion tank to the cleaning position; a constant volume reaching module for precise positioning of liquid surface and full transferring of the solution to a target position; and a control module. Wet digestion and microwave digestion are combined in one, the full-automatic inorganic sample pretreatment acid-removing volume metering instrument can independently process a wet digestion sample, by combination of the two methods, most of inorganic analytical samples can be processed, after digestion of the sample,the acid is removed, and the solution is diluted to a desired volume, and the full-automatic inorganic sample pretreatment acid-removing volume metering instrument can realize the full-automatic sample pretreatment.

The invention discloses a novel method for measuring arsenic in urine. AFS-230E double-channel atomic fluorescence photometer is used to quantitatively measure arsenic in urine by wet digestion-hydride generation atomic fluorescence method. Select the best instrument conditions, optimize the composition of the digestive solution, change the digestion instrument and digestion vessel in the process of sample pretreatment, standard curve drawing, sample determination and other experimental operations, reduce the concentration and dosage of reagents, and effectively shorten the The operation process and processing time of sample pretreatment are shortened, the sample detection range is broadened, and the detection limit is reduced, making it suitable for the determination of low arsenic, suitable arsenic and high arsenic in urine samples and the detection of arsenic in large quantities of urine samples. Compared with the prior art, the method of the present invention has the advantages of high precision, good sensitivity, accuracy and reliability, simplicity and quickness, less interference, wide linear range, strong practicability and low cost.

The invention discloses a method for measuring metal element content in polycarbonate. The method mainly comprises the following steps: (1) wet digestion treatment of a sample, namely adding a sulfuric acid solution to a polycarbonate sample to be detected, and then performing heating of the first stage, when the solution turns to black, performing heating of the second stage, and meanwhile, adding hydrogen peroxide solution, and after the solution turns to a colorless and transparent solution from black, continuing heating until no bubble is generated in the solution, and then cooling the solution to room temperature for later use; (2) preparation of a sample solution; (3) preparation of a blank solution; (4) preparation of a standard solution; (5) drawing of a standard curve; (6) measurement of the metal element content. The method has the advantages of simple operation, safety, speediness, good repeatability, high accuracy and the like, and is suitable for measuring metal elements in similar substances.

The invention provides a method for measuring selenium in food through combination of double cloud point extraction and hydride generation (GG)-atomic fluorescence spectroscopy (AFS). The method comprises the following steps that firstly, a sample is digested through a wet method; secondly, primary cloud point extraction is carried out on the digested object obtained in the first step, then a mixed solution of HC1 and H2O2 is adopted as back-extractant, and secondary extraction is carried out to concentrate selenium; thirdly, the content of selenium in the sample is measured through the HG-AFS method. It is achieved for the first time that double cloud point extraction and the HG-AFS are applied to detection of the selenium in food in a combination mode, according to the method, the detection limit is 0.16 microgram/L, RSD is 4.04%, the method is high in accuracy and precision, the detection limit is low, and the method is especially suitable for measuring the trace selenium in the food such as spiral seaweeds, kelp and tea.

The invention discloses a production process of a high-activity desulfurizer slaked lime. The production process comprises the following steps: S1, mechanically crushing quick lime blocks to obtain aquick lime particle raw material with the particle size of 2-10mm; S2, slaking the quicklime particle raw material and slaking water to obtain lime slurry; S3, supplementing a certain amount of quicklime raw materials into the lime slurry, stirring and digesting to obtain slaked lime granules; wherein in the step, the slaking temperature is 70-110 DEG C, the slaking time is 20-60 minutes, the useamount of the supplemented quicklime raw material accounts for 20-40% of the mass of the total lime, and the mass ratio of slaked water to slaked lime granules in the slaked lime granules is (0.6-1):1; and S4, performing impurity removal treatment and separation treatment on the slaked lime granules to obtain slaked lime powder with a desulfurization function. According to the method, a wet digestion process and a dry digestion process are combined, heat released by a digestion reaction is fully utilized, and the problems that slaked lime obtained through a traditional dry method is low in conversion rate, large in powder particle, adhesive, small in specific surface area and low in porosity are solved.

The invention relates to the technical field of detection of biological preparations, in particular to a method for detecting cadmium of an enzyme preparation. The method comprises the following steps: (1) pretreating a sample and performing wet digestion on the sample; (2) preparing a standard curve; (3) measuring; (4) calculating the result. The method is verified through accuracy degree and precision degree (repeatability and reproducibility), the applicability of the enzyme preparations in different industries and the true value regression test of standard rice substances, and the method is a simple, convenient, reliable and accurate method.

The invention relates to an identification method of animal calculus type traditional Chinese medicines, and specifically relates to a bos taurus domesticus gmelin ICP-MS identification method and application. The method comprises the following steps: performing wet digestion on known basic original bos taurus domesticus gmelin and different batches of bos taurus domesticus gmelin samples; performing ICP-MS detection to obtain data of 18 elements, including Li, Na, Mg, Al, P, S, K, Ca, Ti, V, Mn, Co, Ni, Cu, Zn, In, Ba and U; importing the detected data to SPSS 22.0 software; and carrying outclustering analysis. According to the method, a 'group-to-group connection' clustering method is carried out to form a tree-like clustering map through which whether the bos taurus domesticus gmelin to be detected belongs to the same species as the known basic original bos taurus domesticus gmelin; or the data are imported to the SIMCA-P 14.1 software, and PCA analyzing is carried out to obtain aPCA scatter diagram, and meanwhile, the uniform stability of the bos taurus domesticus gmelin of different batches and to be detected can be determined based on the gathering degree in the scatter diagram. Therefore, the species origin of the bos taurus domesticus gmelin is identified based on inorganic element; the uniform stability of the bos taurus domesticus gmelin at different batches can beidentified. The method is simple and quick.

The invention discloses a method for determining the mercury content in hair by a DMA-80 direct mercury measuring instrument. The method comprises the following steps that (1) a sample is prepared bycutting and directly feed hair, or washing the hair with deionized water, immersing the hair by an organic solvent for 5-10min, air-drying the hair naturally, cutting the hair, and feeding the hair directly for analysis; and (2) the DMA-80 direct mercury measuring instrument is used for determination at the drying temperature of 50-100 DEG C and the decomposition range of 400-700 DEG C. Via the method of the invention, pretreatment including microwave digestion or wet digestion is not needed, mercury loss due to a pretreatment method is reduced, operation is simple, pollution is less, detection is rapid, and the accuracy and precision are higher.

The invention belongs to the technical field of a food detection method, particularly relates to a method for determining the sodium content in food by a sub sensitivity line atom absorption spectrum. The method comprises the following steps of 1, sample digestion; 2, determination: (1) setting the parameters of an atomic absorption spectrometer, wherein the absorption wavelength of the atomic absorption spectrometer is set to be 330.24nm; (2) drawing a standard curve; (3) sodium content determination. Compared with the prior art, the method provided by the invention has the advantages that a sample pretreatment method is improved; a microwave digestion method is increased and optimized for replacing wet process digestion, so that the pretreatment is safe, convenient, fast and efficient. Through the use of the sub sensitivity line (330.24 nm) of sodium elements, the work conditions of an instrument is regulated and optimized; the determination is performed by a flame atom absorption spectrum method; the linear range is wide (1 to 50 mug/mL); the accuracy is high; the sample does not need to be diluted for many times; the sample mass detection efficiency is greatly improved.

The invention provides a pretreatment method for a solid food sample based on ionic liquid, and the method comprises the following steps: contacting the ionic liquid with a to-be-treated solid food sample, performing heating under the condition of concentrated HNO3 until the sample is completely dissolved, adding deionized water, and performing filtering. Compared with wet digestion, the pretreatment method established by the invention has the advantages that the pretreatment time can be shortened by 36-48 times, and the dosage of the acid liquor is reduced by 12-20 times, so that a green, safe and rapid pretreatment technology in heavy metal ion detection and analysis of the food solid sample is provided.

The invention relates to a color-coated plate, in particular to a pretreatment method for detecting a color-coated plate. A method for measuring the pretreatment film weight of a color-coated plate, which includes the following steps: a sample sealing step: using a rubber sample dissolving cup with a large inner diameter and a small rubber sample cup to seal the non-measurement surface; the sample stripping step: using hydrochloric acid-hexamethyl Tetraamine corrosion inhibition system, the pretreatment film is peeled off together with the coating, and the substrate itself is not corroded and dissolved at this time; the digestion sample step: use nitric acid and hydrogen peroxide wet digestion to transfer all the components to be measured into the solution to make a test solution; pretreatment film weight measurement steps: use ICP-AES or FAAS method to measure the pretreatment film weight of the color-coated board. The method of the invention is simple and easy to seal the sample, the measurement result is accurate, and the prepared measurement solution can meet the requirements of certain measurement techniques (such as ICP-AES, FAAS, etc.) to measure the weight of the pretreatment film.