42results about How to "Wide range of analysis" patented technology

The invention is a high performance liquid chromatography of determining diversofiform organic acid in the fruit simultaneity. It adopts liquid chromatograph including ultraviolet detector and chromatographic column of silica gel bonding in opposition. It takes organic solvent mobile phase A and aqueous solution mobile phase B of finite concentration pH value as gradient elution agent. The invention only single accomplishes the procession of quantitative detection of the primary organic acid in the fruit on the regular high performance liquid chromatography. The method of the invention is advanced, nicety, simple and convenience, the analyzable time can cut within 8min, improning the analytic efficiency greatly. At the same time, the method takes the Carrez reagent as decontaminant of fruit sample, this is the first time using the Carrez reagent to detect fruity organic acid.

The invention relates to a key functional part of a wave spectrum-energy spectrum combined type X-ray fluorescence spectrometer, in particular to a distribution analysis image acquisition and data processing system for a wave spectrum and energy spectrum combined type X-ray fluorescence spectrometer. According to the system, a surface area of a to-be-tested sample is precisely positioned through an imaging module; the sample is driven to move to an appointed position for energy spectrum full-element distribution analysis and wave spectrum unit element distribution analysis; energy spectrum data and wave spectrum data are combined through a data quantitative and qualitative analysis module, then distribution analysis information of element contents of the to-be-tested area on the surface ofthe sample is obtained, and two-dimensional and three-dimensional data models are established and displayed through a data image processing module. By adopting the system, with the combination of rapid scanning of energy spectrums and fine scanning on key areas through wave spectrums, rapid high-precision positioning analysis on a sample is carried out, the analysis speed is increased, and the analysis sensitivity is improved; with the combination of common analysis and element distribution analysis, and with the combination of wave spectrums and energy spectrums, the application field of WEDXRF spectrographs is widened.

The invention discloses an application of a nitrogen-doped carbon point to analysis of micro-molecular environmental pollutants, and particularly relates to the application taking the nitrogen-doped carbon point (N-CDs) as a matrix of a matrix-assisted laser desorption ionization-time of flight time mass spectrometry (MALDI-TOF MS) to the analysis of the micro-molecular environmental pollutants. By taking the nitrogen-doped carbon point as the matrix, the analysis and detection on the micro-molecular environmental pollutants with the m/z ranging from 150 to 1000 can be efficiently and rapidly realized. Suitable micro-molecule types comprise hydroxyl polycyclic aromatic hydrocarbon, nitryl polycyclic aromatic hydrocarbon, bisphenol compounds, perfluoro-acid environmental pollutants and the like. When the nitrogen-doped carbon point is used as the matrix to detect micro-molecules, background interferences of a traditional organic matrix ion peak can be effectively eliminated; an ionization agent does not need to be added and the requirements on sample treatment are reduced; the nitrogen-doped carbon point has good reproducibility and high salt resistance; and an efficient and rapid detection method is provided for the environmental pollutants and an application range of the carbon point is expanded.

A method for rapidly detecting trace tin in the hull steel by adopting the atomic fluorescence spectrometry relates to the technology field of the special steel detection. Tartaric acid, thiourea and ascorbic acid are adopted as a masking agent so as to successfully eliminate the interference of the elements. The analysis time of one sample requires about 5 hours. The method is suitable for measuring the tin content with a mass fraction of 0.0001%-0.10%, a mark-on recovery rate of 98%-108% and detectability of 0.76ng/ml. The method has the advantages of lower interference, wide analytical range, high stability, high speed, etc., when detecting trace tin in the hull steel.

The invention relates to a method for measuring arsenic in sulfate slag. An aqua regia sample is adopted and the method comprises the following steps of: weighing pure iron equivalent to iron in the sample in quantity, performing matrix matching by adopting iron base, preparing standard solution of a working curve with effectively eliminating the base interference of the iron base, selecting an analysis spectral line of the arsenic in the sulfate slag by using the conventional inductive coupling plasma spectrograph in a control laboratory, measuring the working curve and the spectral intensity of the arsenic in the test solution on the inductive coupling plasma emitting spectrograph, and directly obtaining the analysis result of the sample by automatic regression calculation of a computer. The method solves the problems of fussy operating process of sample dissolution, absorption and color comparison in the conventional method, poor analysis and operation of high content arsenic and lower analysis result.

The invention discloses a method for rapidly measuring the content of calcium fluoride in fluorite by an X-ray fluorescence spectrometer. The method comprises the following steps: accurately weighing 1.5000-2.2000 g of fluorite sample and special fluorescent mixed flux 3.0-3.3 times more than the mass of fluorite sample; mixing uniformly and then placing in a gold-platinum crucible; adding 8 drops of a mold release agent lithium bromide; fusing according to a preset automatic sample fusion program in a high-frequency automatic sample fusion machine, to prepare glass sheets for analysis; placing sample pieces prepared by fusion in a wavelength dispersion type X-ray fluorescence spectrometer; selecting work parameters; using a K alpha line of fluorine as an analytical spectral line; measuring with an instrument; automatically calculating the content of calcium fluoride in the sample. The method provided by the invention overcomes a particle size effect and a mineral effect of the sample, and is easy to operate, short in time consumption, free of pollution brought by chemical reagents, wide in analysis range, high in accuracy, good in reproducibility, and suitable for measurement of various fluorite components, in particular measurement of calcium fluoride in fluorite ore with high content of calcium carbonate and calcium sulfate.

The invention provides a time-resolved fluorescence immunoassay method of Lp-PLA2. The double antibody sandwich method and the time-resolved fluorescence immunoassay method are used together to measure the content of Lp-PLA2. The time-resolved fluorescence immunoassay method comprises the following steps: adding an Lp-PLA2 standard substance or a centrifuged blood serum sample into respective micropores in a microporous plate coated with an Lp-PLA2 resistant monoclonal antibody A; after oscillatory reaction, washing with a concentrated cleaning solution, then adding a biotin labeled Lp-PLA2 resistant monoclonal antibody B; after oscillatory reaction, washing with the concentrated cleaning solution; adding lanthanide labeled streptavidin, and washing with the concentrated cleaning solution after oscillatory reaction; after adding an enhancement solution and oscillating, performing fluorescence emitting under excitation of ultraviolet light, testing the fluorescence strength cps with a time-resolved fluorescence spectrometer, and determining the content of LP-PLA2 in a sample to be tested in comparison with a standard curve. The time-resolved fluorescence immunoassay method can quantitatively test the content of Lp-PLA2 in the sample, and has the characteristics of high sensitivity, wide analysis range, good stability, quick detection and easy automation.

The invention discloses a financial risk assessment method, relates to the technical field of financial risk assessment, and mainly aims to solve the problems of low efficiency and large error of existing financial risk assessment. The method comprises the following steps: reading a service attribute of a user account according to the user account in an evaluation request; Reading financial data of the user account according to the user account in the evaluation request, and carrying out data auditing on the financial data; Performing commercial value analysis on the financial data; Performingbusiness risk analysis on the financial data; And assessing the financial risk according to the commercial value analysis data and the commercial risk analysis data. Through commercial value analysisand commercial risk analysis, financial risks are evaluated comprehensively, financial risk evaluation data are obtained, manual recording and analysis are not needed, the financial risk evaluation efficiency is high, the analysis range is wide, and the financial risk evaluation effect is good.

The invention provides an internet payment security automatic denial system, and relates to the field of internet payment security. According to the internet payment security automatic denial system, after a transaction between a buyer and a seller begins, risk assessment is carried out, and whether the transaction is ended or not is judged by calling account data in a risk value mode. In the risk assessment, account information, exchange transactions, exchange transactions, time and places are integrally analyzed and judged, the risk degree of the transactions is determined, and the safety of user transactions is ensured.

The invention relates to a method for analyzing protein contents, and specifically discloses a method for analyzing a protein content in flavored yogurt subjected to pasteurization heat treatment. Theanalysis method at least comprises the following steps: (1) configuring the yogurt to be analyzed into different standard solutions, and detecting the standard solutions by using a Kjeldahl apparatus; after preprocessing the standard solutions separately, detecting the standard solutions by using the Kjeldahl apparatus and a milk composition analyzer in sequence, and calibrating the results to obtain a standard curve; (2) preprocessing the yogurt to be analyzed, and detecting the yogurt to be analyzed by using the milk composition analyzer to obtain a detection result; and (3) comparing the detection result in the step (1) with the standard curve in the step (2) to obtain the protein content. The detection method provided by the invention has the advantages of wide test range, simple andconvenient operation, efficient and precise test, good repeatability, etc.

The invention provides a liquid chromatography tandem mass spectrometry detection method for measuring a phthalates plasticizer in an aquatic processing product, and belongs to the technical field ofproduct safety and detection. The method comprises the following steps: extracting the phthalates plasticizer in the aquatic processing product through the matching of an extraction agent and a dispersing agent; after purifying and eluting a sample solution obtained by extracting, detecting the sample solution by using an ultra-high performance liquid chromatography tandem mass spectrometry; and the dispersing agent is tetrabutylammonium chloride and 4-hexylresorcinol. According to the liquid chromatography tandem mass spectrometry detection method for measuring the phthalates plasticizer in the aquatic processing product provided by the invention, a pretreatment process is high in target selectivity and enrichment factor and good in operation repeatability, small in solvent dosage, strongin purification effect, wide in linear range of a measurement result, high in accuracy, high in target ion determination specificity and sensitivity, high in sample purity and stability, small in matrix interference, strong in practicability, and has the application of detecting the phthalates plasticizer in the aquatic processing product.

The invention belongs to the technical field of electron microscope sample collection and detection, and discloses an atmospheric particulate collection system and method for an electron microscope. The system comprises a laser emission module, a photoelectric detection module, a data processing module, and a central control module; a laser particulate matter sensor is provided with a shell; an MCU microprocessor is arranged in the shell; the output end of the MCU microprocessor is connected with a laser through a laser control circuit; the input end of the MCU microprocessor is connected with a photoelectric detector through an amplifying circuit; and the output end of the MCU microprocessor is connected with a data output interface and connected with a fan through a control circuit. The laser emits laser, and the laser irradiates suspended particles in the air to generate light scattering; the photoelectric detector collects scattered light intensity within a certain angle range, linearly converts the obtained scattered light intensity into voltage and transmits the voltage to a data processing system module; and the data processing module performs data processing through a data processing program to obtain the equivalent particle size of the particles and the number of the particles with different particle sizes in unit volume.

The invention relates to a hyperspectral imaging technology, and discloses an MEMS-based hyperspectral system and spectrograph, the MEMS-based hyperspectral system comprises a light source (121), a light beam processing unit and MEMS scanning micromirrors (151), and the MEMS scanning micromirrors (151) are array type scanning micromirrors; light beams (142) of the light source (121), which are processed by the light beam processing unit, enter the MEMS scanning micromirror (151), and the light beams (142) are sequentially reflected by the MEMS scanning micromirror (151) as required; the interference system (160) comprises an MEMS translation micro-mirror (163), a light beam (142) reflected by the MEMS scanning micro-mirror (151) enters the MEMS translation micro-mirror (163), and the MEMS translation micro-mirror (163) modulates and reflects the light beam (142); the spectrometer designed by the invention is small in size, high in resolution, good in stability and low in cost.