151 results about "Relative standard deviation" patented technology

The invention relates to the field of methane change dynamic traceability analysis, and discloses a methane change dynamic traceability analysis and early warning system based on artificial intelligence, and the system comprises a data collection module which collects methane concentration data, constructs a two-state three-dimensional monitoring network, and calculates a relative standard deviation; the multi-source analysis module is used for merging calibration environment data, generating a three-dimensional matrix, iteratively updating a class cluster mean value and judging whether a burst leakage traceability process is triggered or not; capturing a time sequence dependency relationship, adding abnormal data optimization, analyzing and triggering residual drive and retraining; the anomaly recognition module is used for constructing a four-dimensional source feature matrix and dynamically adjusting the source feature weight; constructing an observation data matrix, and solving the contribution proportion of each source to the methane concentration; iteratively optimizing the source intensity parameter until convergence; and the early warning response module is used for dynamically updating a historical residual mean value and a standard deviation, judging a response level, reversely tracking an air mass track, positioning a potential emission source coordinate, and triggering a corresponding early warning response if an abnormal degree condition is met.

The invention discloses a method for evaluating cigarette product quality stability based on a multi-dimensional space chemical fingerprint spectrum, and relates to the field of cigarette quality evaluation.The method comprises the following steps that near-infrared diffuse reflection spectrum data of a sample is collected, optimization processing is conducted, and a model is established; establishing a near-infrared correction model by taking a control sample; the method comprises the following steps: collecting gas chromatography fingerprint data, carrying out optimization treatment to establish a model, calculating the dispersion degree of a collected sample and a control sample through a mahalanobis distance, respectively calculating the distribution condition of each type of samples, and evaluating the stability; introducing the collected sample into a contrast model for calculation, determining indexes of the selected cigarette sample, calculating the average content and relative standard deviation of conventional indexes in the sample and the contrast sample, and comparing the similarities of various indexes in the sample and the contrast sample; the method comprises the following steps: collecting sample fingerprints, retrieving the fingerprints through a computer spectrum library, calculating the relative content of each peak, detecting the inherent volatile components of each type of samples, and calculating the deviation.

The invention belongs to the technical field of gas analysis, and relates to a surface-enhanced Raman scattering flexible substrate material as well as a preparation method and application thereof. The surface-enhanced Raman scattering flexible substrate material comprises a three-dimensional network structure and silver nanoparticles, the three-dimensional network structure is composed of hydroxypropyl methyl cellulose nanofibers, the silver nanoparticles are wrapped in the hydroxypropyl methyl cellulose nanofibers, and the silver nanoparticles are of a polyhedral structure. The surface-enhanced Raman scattering flexible substrate material is used for detecting thiol compounds in a solution, and the detection limit can reach 10 <-19 > M level; after the surface of the silver nanoparticle is modified with the probe, the material can detect trace substances in exhaled air. In addition, after the material is stored for 6 months at room temperature, the SERS signal intensity attenuation is less than or equal to 4%, and the relative standard deviation detected by 20 random sites is only 4.04%.

The invention discloses an analysis method for simultaneously detecting organochlorine pesticide and polychlorinated biphenyl, which comprises the following steps of: simultaneously extracting organochlorine pesticide and polychlorinated biphenyl in a water sample by adopting a mixed extraction solvent, dehydrating, concentrating and fixing the volume of extract liquor, separating and measuring by adopting a gas chromatography-mass spectrometry method, and quantifying by adopting an internal standard method. When the mixed extraction solvent is n-hexane / dichloromethane with the volume ratio of 9: 1 and 1% by mass of polyethylene glycol 4000 is added, the recovery rates of water samples with the measured concentrations of 5.00 ng / L, 20.0 ng / L, 40.0 ng / L and 80.0 ng / L are 83.6%-95.4%, 91.2%-105.6%, 93.5%-104.7% and 92.8%-106.9% respectively, the relative standard deviations are 6.1%-9.2%, 3.3%-8.2%, 3.2%-6.3% and 3.4%-7.5% respectively, compared with the prior art, the extraction efficiency is remarkably improved, and the method has the advantages that the method is simple, the cost is low, and the method is suitable for industrial production. The accuracy and precision of the method completely meet the determination and analysis requirements for measuring complex water samples.

A method is provided of designing seismic surveys for a geographical area using controlled randomization. The method comprises the steps of selecting the geographical area to be surveyed; determining placement for one or more control areas, wherein each control area comprises a plurality of stations, within the geographical area; applying a randomization algorithm to each of the one or more control areas; creating a Fresnel fold map of the geographical area; and applying a relative standard deviation algorithm to the Fresnel fold map to confirm if the randomization algorithm has created an even distribution of data.

The invention discloses a method for measuring the moisture absorption capacity of a moisture absorption film, and relates to the technical field of moisture absorption capacity measurement of moisture absorption materials, and the method comprises the following steps: S1, selecting a closed detection environment with constant conditions; s2, selecting a predetermined number of samples, and obtaining the single area and the mass of each sample before moisture absorption, and the total mass m1 and the total area S of the predetermined number of samples before moisture absorption; s3, storing a predetermined number of samples in a detection environment, taking out the samples, and obtaining the mass of each sample after moisture absorption and the total mass m2 of the predetermined number of samples after moisture absorption; and S4, based on the area of each sample, the mass before moisture absorption and the mass after moisture absorption, obtaining the moisture absorption capacity of each sample, calculating the relative standard deviation of the moisture absorption capacity of a predetermined number of samples, and if the relative standard deviation is within a predetermined threshold range, calculating the moisture absorption capacity of the moisture absorption film based on the total mass m1 before moisture absorption, the total mass m2 after moisture absorption and the total area. The determination result of the determination method is high in accuracy.

The present invention relates to a digital thin-layer chromatography detection and analysis model, a method for establishing the same, and an application thereof, belonging to the technical field of traditional Chinese medicine quality control. The digital thin-layer chromatography detection and analysis model is established based on the relative migration distance value (RPf) theory, and can be used for digital thin-layer chromatography analysis without physical reference. Under different experimental conditions and for different experimental varieties, the relative standard deviation of the RPf value is the smallest, showing better performance than RRf, and demonstrating the application advantages of the characteristic spot migration distance method in the digital standard of traditional Chinese medicine thin-layer chromatography.

The invention discloses a regional wind speed meteorological reference station representativeness evaluation method based on a correlation function field, a medium and a program product. The regional wind speed meteorological reference station representativeness evaluation method comprises the following steps: collecting multi-year day-by-day wind speed data of a high-density meteorological observation station in a target region and environment information of the observation point; selecting an independent sample of day-by-day wind speed data in each same time period in the region; establishing a correlation function field between every two stations, and fitting a relation model of correlation functions and distances; estimating a standardized observation random mean square error; calculating the relative standard deviation generated by replacing the target point wind speed truth value data with the reference station wind speed observation data; and evaluating the excellent grade of the spatial distance range represented by the wind speed of the reference station. The method can achieve the good representative evaluation of the reference station in the distance range, and has important practical values for the selection of a reliable meteorological reference station in the climate feasibility demonstration of wind power development site selection, urban and rural construction planning and the like, the evaluation of extreme climate risks and the calculation of the accuracy of engineering meteorological parameters.

The invention discloses a qualitative analysis method for monitoring impurity ion sources in a water electrolysis system, which belongs to the technical field of water electrolysis system monitoring, and comprises the following steps: sampling electrolyte in the water electrolysis system, detecting the type and concentration of impurity ions in the electrolyte, continuously sampling for multiple times, and determining the concentration of the impurity ions in the electrolyte; the relative standard deviation of the impurity ion concentration in multiple sampling is calculated, when the relative standard deviation is smaller than a set value, the controller analyzes whether the measured concentration of each type of impurity ions exceeds a set corresponding normal concentration range or not, and otherwise, the detection equipment is calibrated and measured again; the source of the foreign ions is judged according to the types of the exceeded foreign ions, a corresponding fault signal is output, and an alarm or an alarm shutdown instruction is executed; if not, a normal signal of the system is output, and the method can accurately judge the specific source of the impurity ions, so that the specific fault or failure part is positioned, the troubleshooting time is saved, the maintenance is convenient, and the potential safety hazard in the production process is reduced.

The invention relates to a cross-instrument intensity correction method and system based on liquid chromatography-mass spectrometry, and the method comprises the steps: constructing a first correction curve based on mass anchor points composed of chemical standard substances with concentration gradients, and correcting the intensity of data collected by the same instrument to a similar level; and further constructing a second correction curve based on the concentration gradient sample, wherein the second correction curve is used for correcting the intensity of data collected by different instruments to a similar level. Wherein a kit consisting of chemical standard substances is designed for mass anchor points, the chemical standard substances have concentration gradient differences in multiple relation, and the types and the quantity of the chemical standard substances can be selected according to the actual condition of a sample to be detected; the construction of the concentration gradient sample comprises the following steps: diluting a quality control sample (QC) formed by mixing all samples to be detected into different concentration gradients, and adding the chemical standard substance. The indexes such as the relative standard deviation (RSD) of the corrected characteristic intensity are comprehensively improved, and the problem of data comparability of different batches, different instruments and different experimental centers can be effectively solved.

The invention provides an electromechanical equipment heat dissipating capacity field measurement device and method, and relates to the technical field of heat measurement, and the electromechanical equipment heat dissipating capacity field measurement method comprises the steps that an exhaust fan and a simulation heat source are started, and a data collection unit receives measurement data obtained through measurement of a temperature sensor, a pressure sensor and a mass flow meter; and after judging that the precision of the electromechanical equipment heat dissipating capacity field measurement device reaches the standard, closing the simulated heat source, starting the electromechanical equipment to be measured, and after thermal stability balance is achieved, calculating the heat dissipating capacity of the electromechanical equipment to be measured through measurement data of the electromechanical equipment in the latest N seconds. By judging that the relative standard deviation of the heat dissipating capacity in the latest N seconds does not exceed 1% and the relative average rising or falling rate of the heat dissipating capacity does not exceed 0.01%, it is considered that the electromechanical equipment heat dissipating capacity field measurement device reaches thermal stability balance, the situation that the heat dissipating power is slowly increased or reduced can be distinguished, the situation that the device enters the thermal stability state mistakenly in advance is avoided, and the measurement accuracy is improved. And errors of measurement results are reduced.

The invention relates to a method for determining phosphorus in a phosphate extraction agent. The method comprises the following steps: (1) digesting the phosphate extraction agent with nitric acid at a certain temperature for a certain time; (2) diluting the digested solution with water and fixing the volume to obtain a to-be-detected solution; (3) making a phosphorus standard curve; (4) preparing a blank sample solution; (5) respectively putting the solution to be detected and the blank sample solution into an inductively coupled plasma emission spectrometer, and testing according to a phosphorus characteristic spectral line to obtain equivalent milligrams of phosphorus in each solution; and (6) calculating according to the following formula to obtain the percentage content of phosphorus in the phosphate extraction agent. The method is easy to operate and rapid in analysis process, the problems that in an electric hot plate or microwave digestion method, phosphate extraction agents cannot be completely digested, and insoluble substances exist are solved, the lower detection limit of phosphorus in the phosphate extraction agents is 0.0015 mg / L, the relative standard deviation of phosphorus is lower than 0.40%, and the adding standard recovery rate is 99.91%-101.14%.

A method is provided of designing seismic surveys for a geographical area using controlled randomization. The method comprises the steps of selecting the geographical area to be surveyed; determining placement for one or more control areas, wherein each control area comprises a plurality of stations, within the geographical area; applying a randomization algorithm to each of the one or more control areas; creating a Fresnel fold map of the geographical area; and applying a relative standard deviation algorithm to the Fresnel fold map to confirm if the randomization algorithm has created an even distribution of data.

The application discloses a raw coal pore detection method, device, system and medium based on nuclear magnetic resonance. The method comprises the following steps: obtaining relaxation time distribution data of each coal sample based on nuclear magnetic resonance T2 test; obtaining total integral areas of a plurality of nuclear magnetic resonance T2 spectra corresponding to each coal sample based on the relaxation time distribution data of each coal sample; performing statistical analysis on the relative standard deviation of the total integral areas of each coal sample to obtain the relative standard deviation corresponding to each coal sample; and determining the coal sample parameters of a target coal sample for detecting the pore structure of the raw coal according to the coal sample parameters of the coal sample corresponding to the relative standard deviation satisfying the preset condition. The raw coal pore detection method provided by the application can determine the target coal sample by selecting the coal sample parameters of the coal sample satisfying the preset condition, so that the result of the nuclear magnetic resonance T2 test for detecting the pore structure of the raw coal is more accurate and stable.

The invention provides a method for rapidly screening illegally added propranolol in a functional beverage, which adopts a liquid phase microextraction technology to separate and enrich a sample, adopts an ultraviolet visible spectrophotometer to detect illegally added propranolol, and adopts an external standard method to quantify, the established method has good linearity, the correlation coefficient of propranolol is greater than 0.999, and the result shows that the method can be used for rapidly screening the illegally added propranolol. The detection limit is 97.2 [mu] g / L, the recovery rate is 95.5%-108.1%, and the relative standard deviation (RSD) is 0.99%-5.59%. The method is good in accuracy, high in precision and sensitivity and suitable for rapidly, qualitatively and quantitatively screening the propranolol illegally added in the functional beverage.

The invention relates to an underwater gamma-ray energy spectrum repeatability analysis method and device and a storage medium. The method comprises the following steps: acquiring a gamma-ray energy spectrum group measured underwater; performing spectrum unfolding on the gamma-ray energy spectrum group based on a Gold iterative deconvolution spectrum unfolding algorithm to obtain energy of gamma incident rays; solving a peak value and a peak area of the gamma-ray energy spectrum group by adopting a gravity center method; determining a first relative standard deviation corresponding to the peak value and a second relative standard deviation corresponding to the peak area; and determining the repeatability of the gamma-ray spectrum group based on the first relative standard deviation and the second relative standard deviation. According to the method, the background is deducted in a spectrum unfolding mode on the basis of the Gold iteration deconvolution spectrum unfolding algorithm, then the peak value and the peak area are calculated, the background deduction error is reduced, the repeatability is improved, meanwhile, the Gold iteration deconvolution spectrum unfolding algorithm reduces the measurement time, and the measurement accuracy is improved. Therefore, the technical effects of reducing the error of background deduction and improving the repeatability based on the Gold iteration deconvolution spectrum unfolding algorithm are realized.

The invention discloses preparation of a TiO2 core Ag satellite hybrid super nanostructure and application to SERS (Surface Enhanced Raman Scattering) detection of sisomicin, and relates to the field of analytic detection.The TiO2 core Ag satellite hybrid super nanostructure is synthesized by modifying the surfaces of TiO2 microspheres, adsorbing Ag nano-particles through static electricity and can be used as an SERS substrate to detect sisomicin, and through a charge transfer mechanism between cores and satellites, the SERS detection of the sisomicin can be realized. The detection sensitivity of sisomicin is greatly improved. Under the optimal experimental conditions, the linear detection range of sisomicin is 10 <-5 >-10 <-11 > M, the detection limit is 7.12 * 10 <-12 > M, and the relative standard deviation of SERS intensity is less than 10%; the method is simple and convenient to operate and high in accuracy and sensitivity, does not need a complicated operation technology, and meets the requirements of large-batch and rapid analysis and detection.

The invention discloses a method for determining the content of cadmium in edible salt through a coprecipitation atomic absorption graphite furnace method, and belongs to the technical field of trace detection. According to the characteristic that cadmium ions can generate cadmium hydroxide under an alkaline condition, ferric nitrate is used as a coprecipitator, the pH value is adjusted to 9.0 by using ammonia water, the generated cadmium hydroxide and ferric hydroxide are co-precipitated, a supernatant is removed, the precipitate is acidified, an atomic absorption spectrophotometer graphite furnace method is used for determination, and a result shows that the adding standard recovery rate of a sample is 104%; and the relative standard deviation is 2.4%. And the relative standard deviation between the ICP-MS determination result and the determination result of the method is 0.03%, which indicates that the interference of the method is not obvious. According to the method, the interference of sodium chloride in the sample is eliminated, the cadmium element in the sample can be enriched, and the cadmium content in the test sample is increased, so that the detection lower limit of the determination of the cadmium content in the edible salt is reduced, and the determination accuracy and precision are improved.

The invention discloses a method for detecting various organophosphorus esters in a water body, belongs to the technical field of organophosphorus ester detection, and particularly discloses a method for extracting various organophosphorus esters in water and a detection method for analyzing various organophosphorus esters in a full scanning mode based on ultra-high performance liquid chromatography electrostatic field orbitrap mass spectrometry. According to the method provided by the invention, 12 typical organophosphorus esters in the water body can be effectively separated, accurately qualitatively quantified and accurately quantified, the ion mass-to-charge ratio deviation is within 5ppm, and a good linear relation and a correlation coefficient gt are shown when the concentration is in a range of 2.5-200mu g / L; the detection limit ranges from 0.140 ng / mL to 0.921 ng / mL, and the quantification limit ranges from 0.280 ng / mL to 1.84 ng / mL. The matrix adding standard recovery range is 74.0%-117.1%, the relative standard deviation between parallel samples is lower than 10%, and the method has good reproducibility and low detection limit.

A kind of TiO2 core Ag satellite hybrid super nanostructure preparation and sisomicin SERS detection application, it is related to the field of analysis and detection, first TiO2 microsphere surface modification, by electrostatic adsorption Ag nanoparticles, synthesis a kind of TiO2 core Ag satellite hybrid super nanostructure, can be used as SERS substrate detection sisomicin, by charge transfer mechanism between core and satellite, greatly improve the detection sensitivity of sisomicin.Under the optimal experimental conditions, the linear detection range of sisomicin is 10 ‑5 ~10 ‑11 M, the detection limit is 7.12× 10 ‑12 M, the relative standard deviation of SERS intensity is less than 10%;The method is simple, accurate and high sensitivity, without complex operation technology, meet the requirements of large quantities and rapid analysis and detection.

The invention discloses an MIP / CoNiFe-PBA / RGO / GCE working electrode as well as a preparation method and application thereof, and belongs to the technical field of food safety detection.The prepared CoNiFe-PBA-based self-reporting type molecularly imprinted electrochemical sensor has the following outstanding performances when detecting BPA: the detection limit is as low as 0.18 nM (S / N = 3), the linear range is 1.0-500.0 nM, and in a milk sample labeling recovery experiment, the detection limit is as low as 0.18 nM (S / N = 3), and the detection limit is as low as 0.18 nM (S / N = 3). The recovery rate is 97.18 to 102.96 percent, and the relative standard deviation is 1t; the current retention rate is 93.81% (n is equal to 3) for 100 nM BPA detection in a continuous 15-day water immersion test (0.1 M PBS, pH 7.4) under the room temperature, and the signal attenuation is 8.6% after 10 times of continuous use, and the current retention rate is 93.81% (n is equal to 3) for 100 nM BPA detection.

The invention relates to the technical field of instrument measuring range expansion, in particular to an instrument measuring range intelligent expansion optimization method based on sample dilution, which comprises the following steps: acquiring an effective measuring range threshold value through an intelligent sensor, counting relative standard deviation and signal-to-noise ratio of a concentration interval in the measuring range, and acquiring a precision distribution curve; performing original sample test on a to-be-tested sample, directly detecting if a response value is within a range, starting an intelligent prediction model according to pollutant types and matched dilution parameters of the to-be-tested sample if the response value exceeds the range, and predicting a recommended dilution multiple according to initial test signal intensity and the sample; when the prediction confidence is lower than a threshold value, triggering gradient scanning; carrying out parallel sample measurement on the diluent to calculate relative standard deviation, executing two adjacent dilution multiples if the distance difference between the diluent and the segmented boundary is smaller than a threshold value, and carrying out mutual verification through concentration consistency of an overlapping region; and performing full-process detection on different dilution multiples, establishing a dilution correction model, updating a correction coefficient of the dilution multiples, and updating a range boundary and a precision distribution curve.

The invention provides a method for detecting the content of zinc in a lithium-zinc binary alloy strip based on ICP-OES, and belongs to the technical field of metal material component analysis. According to the method, the lithium matrix is separated by adopting a nitric acid-perchloric acid digestion system, and the stock solution is diluted by 500 times, so that the concentration of the lithium matrix can be efficiently reduced, meanwhile, the signal inhibition effect is effectively eliminated by combining lithium salt matching, and the detection precision is greatly improved. According to the method, Zn 213.856 nm analysis spectral lines are carefully selected, RF power is optimized, spectral interference of other elements can be avoided, the linear range can be expanded, and the method is suitable for rapid determination of the zinc content of 1%-20%. According to the method, the detection limit can reach 0.01%, the relative standard deviation is smaller than or equal to 1.0%, the recovery rate is 98.5%-101.2%, and high-precision detection is achieved.

The invention discloses a liquid chromatography-tandem mass spectrometry detection method for pentachlorophenol in marine products. The liquid chromatography-tandem mass spectrometry detection method comprises the following steps: (1) preparing a sample; (2) extracting; (3) purifying; and (4) liquid chromatography-tandem mass spectrometry detection. According to the method, the PCP in the marine products is detected by adopting a UPLC-MS / MS method, extraction conditions and Captiva EMR-Lipid small column purification conditions are optimized, an isotope dilution internal standard method is used for quantification, the problem of low sample recovery rate is remarkably improved, the linear range of the method is 1-1000 [mu] g / L, the detection limit is 1 [mu] g / kg, the three-gradient standard adding recovery rate and the relative standard deviation are 86%-94% and 3.72%-11.24% respectively (n = 6), the determination result is accurate and reliable, and the method is suitable for industrial production. The method can be used for efficiently detecting pentachlorophenol and sodium salt thereof in marine products.

The invention relates to a paper literature deacidification effect evaluation method based on an anhydrous liquid phase, which comprises the following steps: setting an effectiveness index and a safety index, obtaining each index value of a deacidified paper sample by adopting a corresponding detection method, and comparing the values with a preset threshold value to realize evaluation of the deacidification effect. The effectiveness indexes comprise pH, alkali reserves, deacidification uniformity, polymerization degree and zero-distance tensile strength, and the safety indexes comprise chromatic aberration, appearance deformation and deacidification liquid safety; the deacidification uniformity is evaluated through the distribution uniformity of alkali reserves, and the distribution uniformity of the alkali reserves is that the relative standard deviation of the alkali reserves of a plurality of parts of the paper sample is less than 30%, and the alkali reserves of each part are 0.12-0.60 mol / kg. According to the method, systematic and comprehensive evaluation on the deacidification effect is realized, a clear standard can be provided for industrial admission of deacidification materials and processes, invalid or harmful deacidification treatment is avoided, development of a deacidification repair technology is promoted, and long-term storage and safe utilization of paper documents are realized.

A multidimensional plasma coupling system based on Ag-coated PVP and Au-coated Ag NCs is used for surface enhanced Raman spectroscopy (SERS) detection of gentamicin, relates to the field of analysis and detection, and adopts hydrothermal synthesis to prepare Ag-coated PVP core-shell nanoparticles and Au-coated Ag core-shell cubes (Au-coated Ag NCs). Ag-coated PVP is induced to agglomerate through gentamicin, then Au-coated Ag NCs is introduced to change an electromagnetic field of nanoparticle agglomeration, a Raman characteristic peak of gentamicin is changed, and gentamicin is distinguished from a homologue of gentamicin. Under optimized experimental conditions, the linear detection range of gentamicin is 10 <-5 >-10 <-9 > M, the detection limit is 6.23 * 10 <-10 > M, and the relative standard deviation of SERS intensity is less than 10%. The method is simple and convenient to operate and high in accuracy and sensitivity, does not need a complicated operation technology, and meets the requirements of large-batch and rapid analysis and detection.

The invention provides a method for rapidly detecting the content of theophylline in plasma, urine, medical sewage and functional beverages. According to the method, aiming at theophylline analytes in different samples, firstly, the samples are pretreated by adopting a liquid phase microextraction (LPME) technology, and then the pretreated theophylline is detected by adopting liquid phase-tandem mass spectrometry (LC-MS / MS). According to the method, an external standard method is adopted for quantification, the established method is good in linearity, the linear range is 0.01-10 mg / L, the correlation coefficient of theophylline is larger than 0.999, the detection limit is 0.2 microgram / L, the quantification limit is 0.7 microgram / L, the adding standard recovery rate is 86.7%-111.3%, and the relative standard deviation is smaller than 9%. The method is easy to operate and convenient to use, has the advantages of being good in accuracy, high in precision and sensitivity and the like, and provides a reliable method for rapid detection of theophylline in various actual scenes such as medical treatment, market supervision and environment monitoring.

The application provides a method for determining the content of cobalt and nickel in a plating layer, relates to the technical field of plating layer component analysis, and adopts nitric acid to heat and digest the plating layer sample, so that cobalt and nickel are completely dissolved in the form of ions, and a to-be-measured mother liquor is prepared by constant volume; a buffer color developing solution with a pH value of 8-12 and containing disodium EDTA and ammonium chloride is prepared, cobalt and nickel standard samples and the to-be-measured mother liquor are respectively combined with the buffer color developing solution to develop color, the absorbance is measured at the characteristic absorption wavelength of cobalt and the characteristic absorption wavelength of nickel, the interference correction coefficient is obtained according to a standard curve, the concentration of cobalt and nickel ions in the to-be-measured mother liquor is calculated according to the absorbance and the interference correction coefficient, and the content of cobalt and nickel in the plating layer is converted by combining the sample weight and the constant volume. The application does not need large and expensive instruments, has low reagent cost, is simple to operate, has a relative standard deviation of detection of less than or equal to 2%, a standard addition recovery of 98%-102%, high precision and high accuracy, and is suitable for batch and normal detection of electroplating enterprises and detection institutions.

The invention provides a method for detecting various plant-derived biochemical pesticides in apples, and belongs to the technical field of pesticide detection. According to the method, acetonitrile is used for extracting the plant-derived biochemical pesticide, graphene / nano-ZrO2 / C18 is used for purification, and qualitative and quantitative detection and analysis are carried out through high performance liquid chromatography-ultraviolet absorption spectrum-QDa mass spectrum. The result shows that the linear relation of triptolide, thidiazuron, indolebutyric acid, 2, 4-D, paclobutrazol and uniconazole in apples is good in the concentration range of 0.1-10 mg / L, and R2 ranges from 0.9990 to 0.9999; when the addition level is 0.1-10 mg / kg, the average recovery rate in an apple matrix is 80.3-92.3%, the relative standard deviation (RSDs) is 1.1-6.4%, the method detection limit (LOD, S / N > = 3) is 10-15 [mu] g / kg, and the quantitation limit is 50 [mu] g / kg.

The invention discloses a method for detecting the content of sulfate radicals in gallium waste liquid, which is characterized in that the sampling amount is reduced from original 10mL to 5mL, the addition amount of concentrated hydrochloric acid is adjusted from 20mL to 5mL, and the pH value of the system is still maintained at 1-2 after the reaction is complete; the barium chloride solution keeps the original procedure dosage (20mL 10%), barium sulfate is ensured to be completely precipitated, and the steps of filtering, washing, firing and weighing are completed according to the original procedure after precipitation. Multiple parallel tests verify that the relative standard deviation of the method is smaller than or equal to 3%, and the production detection precision requirement is met; the method is compatible with the existing standard operation process of an enterprise, adapts to the characteristic of high concentration of gallium waste liquid sulfate radicals, does not need to add equipment or extra training, and can be directly applied to the ground.