362 results about "Analytical technique" patented technology

The invention discloses an electric power system harmonic propagation analysis method and device and a storage medium, and belongs to the technical field of electric power system harmonic analysis, and the method comprises the steps: inputting a to-be-predicted operation condition parameter and a harmonic voltage parameter into a trained regression prediction model, obtaining a corresponding prediction cross admittance matrix, and obtaining a prediction cross admittance matrix; the predicted cross admittance matrix is applied to harmonic propagation analysis of the power system; wherein the regression prediction model is integrated with Bagging based on a decision tree; according to the method, by improving the data set quality and optimizing the model hyper-parameters, the harmonic source cross admittance matrix which is self-adaptive to the operation condition and is established by adopting the decision tree-based regression device and the Bagging element regression device can meet the harmonic analysis precision requirements under different operation conditions, and harmonic propagation of the power system can be analyzed more accurately; the analysis efficiency is improved, and a feasible technical path is provided for online monitoring or rapid evaluation.

The invention discloses a method for measuring the oxidation rate of silver ore, and relates to the technical field of mineral processing and process mineralogy analysis. The determination method comprises the following steps: preparing and segmenting a sample; silver grade calibration and reselection enrichment are carried out, and products with different mineralogical characteristics are obtained; carrying out automatic mineralogical analysis to obtain the type, content and dissemination characteristics of silver minerals; chemical leaching correction coefficient determination, wherein phase state distribution of silver is obtained through stepped chemical leaching, and the correction coefficient is calculated; determining a gangue wrapping correction coefficient, analyzing the silver content of the residue and calculating the correction coefficient; and finally, calculating the silver ore oxidation rate based on the automatic mineralogy analysis data and the correction coefficient. According to the method, through multi-technology fusion and data correction, the accuracy and reliability of measurement of the oxidation rate of the silver ore with low silver mineral content and uneven distribution are remarkably improved, and accurate data support is provided for formulation of a mineral separation process.

The invention discloses a trace element content measuring method, and relates to the technical field of metallurgical analysis, the method comprises the following steps: obtaining a plurality of standard reference substances, the matrix components of the plurality of standard reference substances are the same, and the standard contents of the same trace element to be measured in the plurality of standard reference substances are in stepped distribution; under a preset test condition, based on the standard relative sensitivity factor, respectively testing the plurality of standard reference substances through glow discharge mass spectrometry to generate the test content of the to-be-tested trace element; based on the test content and the standard content, determining a calibration proportionality coefficient corresponding to the to-be-tested trace element; based on the calibration proportionality coefficient, calibrating the standard relative sensitivity factor to generate a calibration relative sensitivity factor; and testing the to-be-tested sample through glow discharge mass spectrometry based on the calibration relative sensitivity factor under a preset test condition, and determining the test content of the to-be-tested trace element in the to-be-tested sample.

The invention discloses a method for analyzing the gold occurrence state of a dump leaching sample, and relates to the technical field of mineral processing and process mineralogy analysis. According to the analysis method, through the steps of sample preparation, gold grade calculation and representativeness verification, size grading and enrichment, stepped chemical leaching diagnosis, roasting dissociation and secondary leaching diagnosis, reselection enrichment and precise analysis, occurrence state calculation and the like, the means of reselection, leaching, roasting and the like are systematically combined with a mass balance mathematical model; accurate quantitative analysis of four critical occurrence states of coarse grain gold, leachable gold, wrapped gold and adsorbed gold in the heap leaching process is realized initiatively. The industrial problem that different occurrence states cannot be accurately quantified through a traditional method is solved, and direct and reliable data support is provided for accurate optimization and recovery rate improvement of the dump leaching process.

The embodiment of the invention provides a pollutant source analysis method and device for underground water, equipment and a medium, and relates to the technical field of environmental chemistry analysis. The method comprises the following steps: carrying out water sample collection at candidate pollution source sampling points of target underground water to obtain candidate pollution source water samples, and carrying out water sample collection at downstream sampling points of the target underground water to obtain downstream water samples; wherein the target underground water flows from the candidate pollution source sampling point to the downstream sampling point; performing chemical component feature extraction according to the candidate pollution source water sample to obtain a first chemical feature, and performing chemical component feature extraction according to the downstream water sample to obtain a second chemical feature; performing similarity calculation according to the first chemical feature and the second chemical feature to obtain a target chemical feature similarity; and determining a target pollution source sampling point from the candidate pollution source sampling points according to the target chemical characteristic similarity. According to the embodiment of the invention, the accuracy of pollutant source analysis can be improved.

The invention relates to the technical field of component content analysis, in particular to a method and system for detecting the content of volatile organic compounds in a curing agent, and the method comprises the following steps: determining gas transmission delay according to the no-load operation process of a target tunnel type oven; determining a comprehensive physical reference coefficient according to the physical volatilization operation process of the target tunnel type drying oven without chemical reaction, the gas transmission delay and an Antow empirical formula; determining a current molar evaporation enthalpy and a current pre-exponential factor; determining a physical volatilization benchmark reference value by combining the alignment temperature data at the current moment; and detecting the content of the organic volatile matters in the curing agent according to the physical volatilization benchmark reference value and the actually measured gas concentration data of each curing reaction temperature zone at the current moment. By analyzing the no-load operation process, the physical volatilization operation process without chemical reaction and the current curing reaction operation process of the tunnel type drying oven, the content of the volatile organic compounds in the curing agent is detected, and the detection accuracy is improved.

The present application relates to water quality detection and analysis technical field, specifically to a kind of water total phosphorus multi-parameter synchronous detection method based on water, comprising: after the original water sample is pretreated, the standard test solution obtained is simultaneously introduced into parallel digestion tank and optical cell, and the digestion and conversion of phosphorus compound and the collection of water sample background spectrum are completed synchronously.Digestion liquid is distributed to multiple independent color developing channels, each channel uses characteristic color developing agent configured for different concentration interval or interference condition, concurrent color developing reaction is carried out under the same environment, and the reaction kinetics time sequence spectrum of each channel is collected.The background spectrum and all kinetic spectrum sequences are input into integrated calibration model for data fusion and cross analysis, and total phosphorus content detection result is directly output.The method realizes wide concentration range, high anti-interference capability of water total phosphorus rapid and accurate detection by parallel acquisition of homologous background information and multi-reaction channel kinetic data.

The utility model relates to the technical field of cold box interlayer gas oxygen content analysis, in particular to a cold box interlayer gas oxygen content on-line analysis device which comprises a sampling pump, a three-way electromagnetic valve, a pretreatment box, an analysis instrument and a control system, wherein the sampling pump is used for pressurizing and introducing interlayer gas of the cold box into the analysis device; the analysis instrument is used for analyzing the oxygen content in the pretreated gas; the three-way electromagnetic valve is arranged between the sampling pump and the analysis instrument and is used for remotely switching and analyzing the waste nitrogen and the cold box interlayer gas; the pretreatment box is connected between the three-way electromagnetic valve and the sampling pump. Through remote switching of the three-way solenoid valve and automatic logic setting of the DCS, online intelligent analysis of the oxygen content of the interlayer gas of the cold box is achieved, and the analysis accuracy and efficiency are improved; and an operator can finish the analysis work of the waste nitrogen and the interlayer gas of the cold box without frequently and manually switching an analysis instrument, so that the operation burden is reduced.

The application discloses a kind of aquaculture tail water solubility organic matter characteristic analysis method and system, specifically related to water quality monitoring and analysis technical field, for solving the problem that existing solubility organic matter characterization method is difficult to effectively associate and predict its actual degradation behavior in biological treatment process.Synchronously obtain the three-dimensional fluorescence spectrum data of the water sample to be measured and the liquid chromatography-organic carbon detection combined analysis data, obtain the hydrophilic-hydrophobic component ratio and the proportion of tyrosine-like and humus-like fluorescence components from the analysis, and then judge whether there is significant humus-like component.According to the judgment result, selectively start the deep analysis of the molecular aggregation state of humus-like component, and comprehensively consider the related proportion parameters and aggregation state information, finally realize the evaluation of the biological degradation potential trend of solubility organic matter, and provide key basis for the stability warning of biological treatment system.

The application discloses a pet food palatability evaluation method based on gas chromatography-ion mobility spectrometry (GC-IMS) and a prediction model construction method, and belongs to the technical field of pet food quality analysis. The application aims at the problems of the existing palatability evaluation, such as strong subjectivity, long cycle and lack of standardized model, and adopts headspace-GC-IMS technology to rapidly detect volatile organic compounds (VOCs) in pet food, so as to obtain a VOCs fingerprint spectrum of the sample. In combination with standard samples with known palatability test results, key palatability markers are screened through orthogonal partial least squares discriminant analysis (OPLS-DA), and a palatability prediction model is established. The application first applies the GC-IMS technology to pet food palatability evaluation, realizes objectification, rapidness and standardization of detection, overcomes the subjectivity and low efficiency of traditional methods, and can provide reliable scientific basis for formula optimization, quality control and raw material screening of pet food.

The application belongs to the technical field of marine chemical analysis, and relates to an underwater in-situ mass spectrometer acquisition control system and method. The method comprises the following steps: a vacuum extraction step: the coarse extraction mode and the fine extraction mode are adaptively switched, the ion detection device is vacuum-extracted until the pressure is reduced to a preset threshold, and a required vacuum degree is maintained; a preheating preparation step: the membrane sampling device is initially sampled, and heating is performed at the same time until a preset working temperature is reached and the temperature is maintained constant; a dissolved gas formal detection step: the membrane sampling device is continuously supplied with water samples to be detected, and in-situ mass spectrum detection of dissolved gas in the water samples is completed; an instrument cabin gas discharge step: when it is detected that the underwater in-situ mass spectrometer floats to the water surface and the air pressure in the instrument cabin exceeds an upper limit threshold of gas discharge, the instrument cabin is discharged; a liquid leakage protection step: when liquid leakage occurs in the sampling cabin and the two core contacts are short-circuited, the high-pressure electromagnetic valve in the normally open state is closed to quickly block the liquid from entering the ion detection device.

This invention relates to the field of electroplating solution analysis technology, and in particular to a rapid analytical method for polyethylene glycol (PEG) additives in copper electrodeposition solutions. The method involves protonated PEG forming a macromolecular complex colloid with phosphomolybdate under acidic conditions of pH 1.0–2.0. This colloid exhibits maximum absorption at 372 nm, and the absorbance value is directly proportional to the PEG concentration in the formed complex colloid. This allows for quantitative analysis of PEG in the copper electrodeposition solution. Because the phosphomolybdate-PEG complex colloid selected in this invention has excellent selectivity, and no sample pretreatment is required, this invention offers advantages such as ease of operation, speed, high sensitivity, and good selectivity. It is particularly suitable for intermediate control analysis in production environments, such as for electroplated copper interconnects in chips and printed circuit boards, as well as electrolytic copper foil for negative electrode current collectors and copper-clad laminates in energy storage batteries.

Disclosed are methods and systems for confirming the identification of samples processed by a high-throughput analytical technique. The method may include distributing a plurality of individual samples to individual predetermined positions of a multi-sample test unit and distributing an identifier material to at least one predetermined position of the multi-sample test unit. The method may also include determining the absence or presence of an analyte in the plurality of individual samples, and determining the presence of the identifier material, wherein the presence of the identifier material at the predetermined position of the multi-sample test unit is used to confirm the identity of the plurality of individual samples positioned in the multi-sample test unit. Also disclosed are systems for performing the methods. The methods and systems may be applied to high-throughput LC-MS / MS or other analytical methods.

This invention discloses a method and equipment for evaluating the tensile toughness of recycled asphalt mixtures, relating to the field of analytical techniques for recycled asphalt mixtures. The method includes: acquiring variables related to the internal structure and external environment of the recycled asphalt mixture to be evaluated; the variables related to the internal structure include: internal structural state variables, the length of the aggregate-binder two-phase interface transition zone, and the elastic modulus; the variables related to the external environment include: tensile strain ratio, loading frequency, and dynamic modulus; and calculating the tensile toughness evaluation value of the cold recycled asphalt mixture based on a predetermined multi-parameter coupling relationship using the variables related to the internal structure and the external environment. This invention introduces environmental factors and internal structural parameters of the recycled asphalt mixture to establish a multi-parameter tensile toughness evaluation model, fully considering the material composition, microstructural distribution characteristics, load factors, and ambient temperature of the recycled asphalt mixture under stress in the structural layer, enabling accurate evaluation of the tensile toughness of the recycled asphalt mixture.

The invention relates to the technical field of biological analysis, in particular to a fish and crustacean biological analysis device which comprises a placing frame and a mobile phase solvent bottle placed in the upper portion of the placing frame, a vacuum degassing box is connected to the lower portion of the placing frame, and a high-pressure pump box is connected to the lower portion of the vacuum degassing box. A sample injection box is connected to the lower part of the high-pressure pump box, a detection box is connected to the lower part of the column oven, an automatic sample injector is arranged in the sample injection box above the placing frame, and a chromatographic column is connected to the interior of the column oven. According to the biological analysis device for the fishes and the crustaceans, through slight shaking in multiple directions, the uniform shaking efficiency and effect of a sample solution in the sample solvent bottle can be improved, the situation that particles settle to the bottom of the bottle and are layered due to long-time standing of the sample solvent bottle is avoided, the concentration of the sample solution sucked by an automatic sample injector is uniform, and the accuracy of the sample solution is improved. Therefore, the accuracy of the detection result of the biological analysis device can be improved, and the biological analysis work of fishes and crustaceans cannot be influenced.

The invention belongs to the technical field of analysis of single particles, and particularly discloses a method for detecting the atomic number ratio of multiple elements in a single particle in a nano material, which can synchronously collect ion signals of all the elements in the single particle, accurately measure the intensity of each element in a transient signal, and improve the detection accuracy. A novel data processing method, namely a statistical distribution fitting method, is adopted, so that the real and accurate multi-element atomic ratio is calculated, and the inherent defects of the traditional SP-ICP-MS and TEM technologies are overcome; meanwhile, the problem that part of nano-particles are unstable in a water phase is solved through an organic phase oxygen adding and sampling method.

This application relates to the field of chemical analysis technology, specifically to a method for detecting the effective components of aloe polysaccharides in aloe vera raw materials. The method includes: obtaining a chromatogram of an aloe vera sample hydrolysate; determining the chromatographic peak corresponding to acetic acid from multiple chromatographic peaks based on the retention time and peak shape characteristics of each chromatographic peak; determining the amount of acetic acid in the aloe vera sample hydrolysate based on the hydrolysis completeness at a current moment and the peak area of ​​the chromatographic peak corresponding to acetic acid at that current moment, wherein the hydrolysis completeness at a given moment is used to characterize the degree of hydrolysis of the aloe vera sample at that moment; and determining the content of the effective polysaccharide components in the aloe vera sample based on the amount of acetic acid. This method can obtain an accurate amount of acetic acid, and based on this accurate amount of acetic acid, the content of the effective polysaccharide components in the aloe vera sample can be accurately detected.

This invention discloses a method for precursor ion scanning in a digital ion trap mass spectrometer, relating to the field of mass spectrometry analysis technology. The method includes: applying a bipolar square wave radio frequency signal with frequency scanning to the ion trap electrode; applying a y-direction auxiliary AC signal to the ion trap electrode, the frequency of which is a fixed division ratio of the radio frequency signal, used to resonate and fragment precursor ions with a specific mass-to-charge ratio at a fixed value during the scanning process; applying an x-direction auxiliary AC signal to the ion trap electrode, the frequency of which is dynamically adjusted according to the mass-to-charge ratio of the target characteristic product ion to match the resonance frequency of the product ion in real time, thereby selectively expelling it; and finally, by detecting the expelled characteristic product ions, obtaining the spectra of all precursor ions that can produce the fragment. This invention achieves efficient and accurate precursor ion screening within a single trap, and is particularly suitable for the rapid on-site detection of novel compounds without a standard spectral library.

The invention discloses a quantitative analysis method for ardealite leachate-carbonate rock fracture corrosion effect, and belongs to the technical field of material analysis. The quantitative analysis method for the ardealite leachate-carbonate rock fracture corrosion effect comprises the following steps: preparing a carbonate sample; preparing ardealite leachate; mounting the sample in a seepage device in a sealing manner, pouring the leachate into the seepage device, and carrying out a seepage test; performing CT scanning on the sample before and after corrosion to obtain a two-dimensional section slice image of the sample, and preprocessing the slice image based on a gray value and threshold segmentation method; and performing three-dimensional digital reconstruction on the preprocessed CT slice data, and calculating pore structure parameters, fracture structure parameters, fractal dimensions and permeability of the sample to complete quantitative analysis. By adopting the quantitative analysis method for the ardealite leachate-carbonate rock fracture corrosion effect, the problem of low analysis accuracy of the ardealite leachate corrosion effect by an existing analysis method can be solved.

The invention belongs to the technical field of analysis of harmful residues of food and medicine homologous substances, and particularly relates to a rhizoma kaempferiae standard sample containing a harmful pollutant lead and a preparation method of the rhizoma kaempferiae standard sample. According to the method, a sample preparation mode of raw material collection, raw material verification, sample pretreatment, vacuum freeze drying, coarse crushing, sieving, uniform mixing, fine crushing, re-sieving, uniform mixing and sub-packaging is adopted, so that the matrix effect and good uniformity and stability of the sample are ensured. By adopting the growth environment characteristics of the actual sample and the growth enrichment rule of the plant, the obtained raw material can have the matrix effect consistent with that of the actual sample, and the expected use purpose is met; the prepared standard sample can maintain the physical and chemical characteristics during long-term storage, so that the stability of the target element lead is ensured; a two-step crushing-sieving-uniform mixing preparation process is adopted, so that sufficient uniformity of the prepared standard sample is fully ensured, and various use requirements of a quality control sample, a proficiency testing sample, a standard sample and the like can be met.

The invention provides a transformer oil acetylene degassing-free detection method and system based on click chemistry, and relates to the technical field of gas detection analysis, a first product generated by a first click chemical reaction and a second product generated by a second click chemical reaction are used as catalysts to trigger a subsequent same cascade chemical amplification reaction, and the detection result is accurate. A single product molecule can catalytically hydrolyze a large number of acid-sensitive substrates, the conductivity of a mixed solution is obvious and can be measured and changed, accurate detection of acetylene with extremely low concentration is realized, and meanwhile, acetylene detection is calculated by utilizing a second click chemical reaction synchronously generated by an internal standard reagent and a triggering agent and independent of an acetylene concentration detection process, so that the accuracy of acetylene detection is improved. According to the method, the signal ratio is obtained by calculating the ratio of the first electric signal value to the second electric signal value instead of the single first electric signal value, interference factors are offset, online self-correction of acetylene detection is realized, and high consistency and accuracy of detection results under different times and different batches of reagents are ensured.

The invention discloses a fire-fighting smoke sensing detection instrument, and belongs to the technical field of chemical monitoring analysis, the fire-fighting smoke sensing detection instrument comprises a combined shell and a combined mounting seat, a smoke detector and an indicating lamp are fixedly mounted in the combined shell, and the detection end of the smoke detector is located on the outer side of the combined shell; through the arrangement of the press-in assembly and the side limiting assembly, during installation, the device only needs to be directly pressed and installed between the two installation plates of the installation frame, the effect of extrusion and immediate installation can be rapidly achieved through the linkage effect, meanwhile, the effect of simultaneous positioning of multiple points is achieved, the installation and positioning rapidness of the structure is improved, and the installation efficiency is improved. Meanwhile, the overall structure is designed into a split type, disassembly and inspection can be conducted regularly, the overall structure does not need to be disassembled, the disassembly process is convenient and rapid, and after inspection, the combined shell and the combined installation base are rapidly assembled, the connecting assembly is rotated, and clamping is conducted again.

The present application belongs to the technical field of chemical analysis, and particularly relates to a composite SERS substrate capable of repeated water washing and a preparation method and application thereof. The present application takes a flexible carbon cloth as a carrier, in-situ grows ZIF-8 on the surface of the flexible carbon cloth, and loads gold nanoparticles on the surface of the ZIF-8 to form a hierarchical composite structure. The present application solves the problems of easy peeling and easy instability of MOF on a flexible substrate from the aspects of a preparation method and a structure, so that the substrate can still maintain good structural integrity and flexible adaptability under the conditions of bending, washing and liquid immersion. Meanwhile, under the premise of not damaging the pore structure of MOF and the enhancement performance of noble metal, the present application introduces a hydrophobic interface to improve the water phase stability and washability, so as to effectively improve the anti-interference ability and detection reliability of the composite SERS substrate in complex liquid samples.

The invention relates to the technical field of chemical analysis, in particular to a method for simultaneously detecting cadmium, tin, mercury, thallium and lead in food, which adopts a high performance liquid chromatography-inductively coupled plasma mass spectrometry method and can realize simultaneous analysis of 14 forms of cadmium, tin, mercury, thallium and lead elements in single operation. By adopting a high performance liquid chromatography-inductively coupled plasma mass spectrometry method, the method disclosed by the invention can be used for simultaneously separating and detecting 14 chemical forms of five elements including cadmium, tin, mercury, thallium and lead in shrimp and crab samples in single operation; the method overcomes the problems of long time consumption, high cost, limited multi-element coverage, organic solvent contained in a mobile phase, low separation efficiency and high detection limit of a single-element sequential analysis mode in the prior art, realizes simultaneous, rapid and accurate detection of multiple heavy metal forms in the cultured shrimp and crab samples, and meets the technical requirements of large-batch sample analysis.

The application relates to the technical field of soil chemical analysis, and discloses a multi-component grading detection method and a detection system for phosphorus in soil, which comprises the following steps: placing a soil sample in a centrifugal tube, and sequentially completing continuous extraction of at least two levels of different extractants without sample transfer in the whole process; after extraction, using a quantitative nondestructive transfer kit to transfer soil residues to a digestion container; adopting a two-step digestion procedure of low-temperature pre-digestion and high-temperature complete digestion to digest the soil residues; and using potassium persulfate solution to rapidly digest part of the extractant containing organic phosphorus; the application also provides a detection system for realizing the method, which comprises an extraction module, an organic phosphorus processing module, a residue phosphorus processing module and a detection module. The application completes multi-step extraction in a single container and optimizes key digestion steps, effectively solves the inaccuracy problem caused by sample transfer loss in the prior art, and significantly improves operation safety and analysis efficiency.

The invention belongs to the technical field of hazardous chemical substance analysis, and particularly relates to a hazardous chemical substance basic informatization data analysis system and method.The hazardous chemical substance basic informatization data analysis system comprises a hazardous substance basic information data acquisition module, a data storage module, a data analysis module, an early warning mechanism module, a visual display module and a user identity information management module; the system is used for collecting relevant basic information of dangerous goods in real time, and the basic information comprises material properties, storage conditions, real-time monitoring data and historical data. The hazardous chemical substance storage environment is monitored in real time through the sensor assembly, the system can find potential risks such as temperature, humidity and gas concentration abnormities in time, so that early warning is given out in advance, accidents are reduced, meanwhile, the early warning mechanism module is arranged, intelligent monitoring and early warning of environment parameters are achieved, and the safety and reliability of the system are improved. A worker can customize an early warning rule according to own requirements, so that timely response is ensured when the environmental parameters are abnormal, and safety is guaranteed.

The application discloses a silver ore oxidation rate determination method, and relates to the technical field of mineral processing and process mineralogy analysis. The determination method comprises the following steps: sample preparation and segmentation; silver grade calibration and gravity concentration enrichment to obtain products with different mineralogical characteristics; automatic mineralogical analysis to obtain the types, content and dissemination characteristics of silver minerals; chemical leaching correction coefficient determination to obtain the phase distribution of silver through ladder type chemical leaching and calculate the correction coefficient; gangue inclusion correction coefficient determination to analyze the content of residual silver and calculate the correction coefficient; and finally, based on the automatic mineralogical analysis data and the correction coefficient, the silver ore oxidation rate is calculated. Through the fusion of multiple technologies and data correction, the accuracy and reliability of the silver ore oxidation rate determination of the silver ore with low silver mineral content and uneven distribution are significantly improved, and accurate data support is provided for the development of the beneficiation process.

The invention relates to the technical field of railway engineering reliability analysis, and particularly discloses a seamless track key influence factor identification method considering multi-source uncertainty, and the method comprises the steps: firstly, constructing an initial factor library and a parameter set based on field and literature data; secondly, a Latin hypercube sampling (LHS) technology is adopted to generate samples in an uncertain parameter space, and an input-response data set is obtained through parametric simulation; secondly, training a high-precision efficient proxy model based on simulation data to replace an original physical model; and finally, implementing Monte Carlo simulation (MCS) based on the agent model, and completing system probability reliability evaluation and global sensitivity analysis. According to the method, the influence of multiple parameters and the coupling effect thereof on the service performance of the seamless track can be evaluated simultaneously in single simulation, the analysis efficiency is remarkably improved, and the method is suitable for reliability analysis and optimization design of the seamless track in a complex environment.

This invention belongs to the field of daily chemical product testing and analysis technology. It discloses an intelligent screening method, device, equipment, and storage medium for sulfur / sulfonate surfactants. The method involves pretreatment of the sample and high-resolution mass spectrometry (UHPLC-MS / MS) scanning, converting the sample into an mzXML file. All secondary mass spectrometry peaks in the file are screened to identify target secondary mass spectrometry peaks containing characteristic ions. The mass and peak intensity of all corresponding precursor ions are extracted. If the mass difference between two precursor ions is within the range of sulfur isotope mass difference and the peak intensity ratio is within a specified range, the precursor ion with the lower mass is selected as the quasi-molecular ion. A predicted molecular formula is generated, and matching structural information is retrieved from a database. Simulated fragmentation is used to obtain a simulated secondary mass spectrum, which is compared with the actual secondary mass spectrum to determine the predicted structure and identify sulfur / sulfonate surfactants. This intelligent processing of high-resolution mass spectrometry data improves data processing efficiency, sensitivity, and accuracy.

The application relates to the technical field of chemical analysis, and discloses a method for extracting, separating and detecting N-nitrosamine, which comprises the following steps: a sample obtaining step; a sample purification step; a preparation and extraction solution step; an extraction solution separation step; an extraction solution concentration step; a chromatographic detection and quantitative analysis step; the sample to be detected is crushed to a size of 0.01g of powder, and the powder is mixed with sodium chloride, barium hydroxide and water. In the application, the sample to be detected is subjected to a step-by-step sample treatment process before detection, so that the interference factors of the sample to be detected can be effectively reduced, the influence on the detection instrument is reduced, the detection result and detection data are more accurate, and when the application is detected, a large amount of sample does not need to be weighed like in the traditional detection mode, the overall operation is more convenient, and the detection demand of N-nitrosamine in smoked food is met.