221 results about "Standard solution" patented technology

The invention discloses a liquid chromatography determination method for a mixed solution of glyoxylic acid, glycollic acid and oxalic acid and application. The method comprises the following steps: (1) preparing standard solutions with different concentrations; (2) detecting the standard solutions with different concentrations by using high performance liquid chromatography; (3) establishing a linear regression equation of each acid according to the relationship between the concentration of the standard solution and the corresponding peak area; (4) pre-treating a sample to be detected, detecting under the same condition as that in the step (2) by using high performance liquid chromatography, and recording the peak area of each acid in the sample to be detected; and (5) substituting the peak area of each acid in the to-be-detected sample into the corresponding linear regression equation, and calculating to obtain the concentrations of glyoxylic acid, glycollic acid and oxalic acid in the to-be-detected sample. The method is a liquid chromatographic determination method which is simple and convenient to operate, excellent in separation effect, mild in chromatographic condition and compatible with various detectors, can accurately quantify three strong-polarity mixed acids of glyoxylic acid, glycollic acid and oxalic acid, and has important practical application value.

The invention discloses a method for determining the content of hydrogen ions in a chloroplatinic acid solution, and belongs to the technical field of analytical testing. In order to solve the problems that the chloroplatinic acid solution is yellow after being diluted and the manual titration end point is difficult to judge, a potentiometric titration method is adopted, and the end point is determined by measuring electrode potential mutation without depending on indicator color change. The method comprises the steps of test condition preparation, burette calibration, standard solution preparation and calibration, sample treatment and titration, result calculation and the like, a full-automatic potentiometric titrator is selected, the titration volume is controlled within the range of 10-15 mL, and a sodium hydroxide standard solution is used for sample titration after calibration. The relative standard deviation of the determination result is less than 0.5%, the adding standard recovery rate is between 96.3% and 103.1%, and the method has the characteristics of high analysis speed, high accuracy and good stability, is suitable for accurate detection of hydrogen ions in chloroplatinic acid production and quality inspection, and effectively solves the defects of the traditional method.

The invention discloses a method for detecting trace chromium element in copper foil based on ICP-OES (Inductively Coupled Plasma-Optical Emission Spectrometer), which comprises the following steps: soaking a lithium battery copper foil in a mixed solution of concentrated nitric acid and hydrofluoric acid for high-temperature digestion, adding a scandium internal standard solution, and fixing the volume to obtain a solution to be detected; preparing a mixed standard solution of chromium element and scandium element with a plurality of concentration gradients, and establishing a standard curve through ICP-OES; and determining the content of the chromium element in the to-be-detected solution according to the standard curve. The lithium battery copper foil is digested through a mixed acid system, concentrated nitric acid provides an acid environment and an oxidation effect, hydrofluoric acid promotes dissolution, it is ensured that the copper foil is completely dissolved, and the digestion efficiency is improved; a scandium internal standard method is introduced, a dynamic background correction mode of ICP-OES is adopted, a scandium internal standard element can correct signal fluctuation in a sample introduction process, dual guarantee is formed by the scandium internal standard element and dynamic background correction, interference of a copper matrix on a Cr spectral line is specifically eliminated, and the trace chromium element detection precision is remarkably improved.

The invention relates to the field of test and analysis of impurity element content of primary magnesium ingots, in particular to a method for testing impurity element content of primary magnesium ingots by ICP (inductively coupled plasma) spectrometry, which comprises the following steps: firstly adding H2O2 into a magnesium ingot sample to infiltrate the sample, then adding HCl at an interval of less than 1 minute to carry out first reaction, carrying out first heating after the reaction is finished, and then carrying out second heating, cooling to 20-30 DEG C, transferring to a volumetric flask, and fixing the volume by using third-level water to obtain a sample solution; establishing a working curve by using an ICP spectrometer and a standard solution; testing the sample solution; the ratio of the mass of the magnesium ingot sample to the volume of H2O2 to the volume of HCl is 1: (3-10): (30-54), the method fills the standard vacancy of ICP spectrometry analysis of the silicon element in the primary magnesium ingot, a reliable basis is provided for chemical component analysis of the primary magnesium ingot, the test result is surface, and the method for testing the mass fraction of the impurity elements in the primary magnesium ingot provided by the invention has the advantages of high analysis precision, simple operation, high accuracy and high reliability. The analysis period is short, and related chemical varieties are few.

The invention belongs to the technical field of iron ion detection, and particularly relates to a rapid detection method for ferric ions in water, which comprises the following steps: a fluorescent probe preparation step: taking trihydrate of copper nitrate and tryptamine, adding into a centrifuge tube in sequence, adding ultrapure water, performing ultrasonic dissolution, transferring into a high-pressure reaction kettle, and performing hydrothermal reaction to obtain a fluorescent probe; cooling to room temperature, centrifuging the obtained yellow green solution in a centrifugal machine, and filtering the supernate through a microfiltration membrane to obtain a copper-doped carbon quantum dot CuCDs stock solution, namely the fluorescent probe; analyzing and determining Fe < 3 + >: taking the diluent of the prepared CuCDs solution, adding the diluent into a centrifugal tube containing a Fe < 3 + > standard solution, uniformly mixing, carrying out fluorescent quantitative analysis and detection, and exploring the change rule of the fluorescence intensity ratio of CuCDs; according to the rapid detection method for Fe < 3 + > provided by the invention, the synthesized CuCDs have high sensitivity, can realize on-site rapid detection of Fe < 3 + > in a water medium, and shows a wide application prospect in the field of environmental monitoring.

The invention discloses a method for measuring the content of calcium fluoride in dolomite-containing fluorite mine. The method comprises an acetic acid solution, a hydrochloric acid solution, a triethanolamine solution, a potassium hydroxide solution and boric acid. The method for measuring the content of calcium fluoride in the dolomite-containing fluorite mine comprises the following steps: S1, reagent proportioning; s2, preparing a calcium standard solution; s3, preparing an EDTA standard titration solution; s4, selecting an instrument; s5, preparing a sample; s6, step analysis; s7, content correction and determination; and S8, calculating a result. The invention belongs to the technical field of calcium fluoride content determination, and particularly relates to a method for measuring the content of calcium fluoride in dolomite-containing fluorite mine, compared with the prior art, the method solves the problem of dolomite dissolution when calcium carbonate is leached by acetic acid, and the content of calcium fluoride in the fluorite mine can be measured by accurately calculating the dissolution amount of dolomite. The measured calcium fluoride content is clearer, more reasonable and more reliable and approaches to a true value, and the process operation is simple and rapid, and is suitable for the requirements in the fields of mine production, assay detection and the like.

The invention relates to the technical field of environmental analytical chemistry, and discloses a thymol phenolphthalein-TBPE double indicator-based cyanide titration detection method and system, and the method comprises the following steps: adjusting a water sample to be detected to an alkaline pH interval to construct a detection matrix; the method comprises the following steps: introducing a double-indicator system composed of thymol phenolphthalein and tetrabromo phenolphthalein ethyl ester according to a specific ratio into a detection matrix, and constructing a spectrum background for masking yellow interference of sulfide by utilizing the blue color development characteristic of thymol phenolphthalein; dropwise adding a silver nitrate standard solution into the mixed system to execute a complex reaction; according to the method, a spectrum background shielding field is constructed, chromaticity response of a system in a specific wave band is monitored in real time, and when a chromaticity mutation signal from green to bluish violet is captured, a titration end point is judged, and the cyanide concentration is calculated. High-precision anti-interference detection on cyanide in a complex high-turbidity matrix is realized, and the sensitivity and accuracy of end point recognition are improved.

The present invention discloses a method for quantitative determination of trace harmful elements in various flotation products of rare polymetallic ores, which includes three parts: sample processing, preparation of complex matrix standard solution and sample testing. Each flotation product is digested with analytically pure concentrated nitric acid; the main mineral species of each product are determined by XRD, and the high-purity standard substances of each main associated mineral are digested with analytically pure concentrated nitric acid, and the content of harmful elements to be monitored is determined by ICP-MS after appropriate dilution; each standard substance digestion solution is diluted to a major element concentration of 1000μg / mL, and used to dilute the harmful element standard stock solution to obtain standard solutions with different concentration gradients; then the process blank and digestion sample are tested using an inductively coupled plasma mass spectrometer using a combination of internal standard method and matrix matching to obtain the content of trace harmful elements to be measured. It effectively overcomes the mass spectrometry and non-mass spectrometry interference problems faced by complex matrix sample testing, is suitable for the analysis and testing of trace element content in complex samples, and has a simple method and is easy to operate.

The invention relates to a method for simultaneously detecting fluorine and chlorine contents in lead concentrate by an ion selective electrode method, and belongs to the technical field of new material detection, and the method specifically comprises the following steps: (1) preparing a sample into a to-be-detected solution; (2) preparing a fluorine ion electrode standard solution and a chloride ion electrode standard solution; (3) calibrating a fluorine ion standard solution and a chloride ion standard solution; and (4) sample determination and data processing. According to the combined measurement method provided by the invention, through a layered coverage method, optimization of the ratio of potassium hydroxide to potassium nitrate and gradient temperature rise, on the premise of ensuring data quality, an accurate result is conveniently obtained; compared with a fluorine or chlorine testing method commonly used in the market, the method is short in time consumption, simple in equipment and accurate in data; in addition, the combined detection method provided by the invention breaks through the pH limit of traditional single ion detection, and provides a reliable solution for synchronous determination of fluorine and chlorine in a complex matrix sample.

The invention relates to the technical field of instrument checking, and discloses a power plant chemical instrument checking method and device capable of automatically adjusting the temperature, and the method comprises the following steps: collecting the temperature of a main water sample and a reference water sample, monitoring the mixed water temperature, and starting checking when the temperature difference exceeds a temperature threshold value; setting a gradient temperature check point, and calculating a theoretical conductivity value; controlling the temperature of the main water sample and the reference water sample by adopting a multi-stage flow path; when the water temperature reaches a steady state, sodium standard liquid is injected, and theoretical sodium concentration increment is calculated; converting the potential signal into a sodium concentration measured value by adopting a difference algorithm; constructing a temperature-concentration double-variable high-order response curved surface model; performing back-stepping to obtain simulation concentration, calculating confidence factors, and triggering grading response; according to the method, a temperature-concentration linkage response curved surface model is constructed, all working conditions of temperature and concentration are covered, confidence factors are introduced to quantify calibration reliability, and an adaptive closed-loop compensation mechanism is established for iterative optimization, so that chemical verification of the power plant is realized.

The invention belongs to the technical field of analysis and detection, and particularly relates to a method for determining cinnamyl glycine in a biological sample based on LC-MS. The method comprises the following steps: mixing the biological sample with an extracting solution, and performing extraction treatment to obtain supernate; evaporating and concentrating, and re-dissolving in an acetonitrile water solution to obtain a solution to be detected; diluting the cinnamyl glycine standard stock solution with a PBS (Phosphate Buffer Solution) to obtain a standard solution with a concentration gradient; mixing the standard substance solution with the extracting solution, performing extraction treatment to obtain a mixed standard solution, and testing the mixed standard solution through LC-MS to obtain a standard curve; and testing the solution to be tested, and obtaining the content of cinnamyl glycine in the solution to be tested according to the standard curve. The method can be used for accurately qualitatively and quantitatively analyzing the cinnamyl glycine in the sample, has the advantages of simplicity in treatment, high flux and reliable result, and is easy to clinically popularize and popularize.

The utility model provides a system for measuring trace hydrogen chloride in hydrogen, the system comprises a drainage module, an absorption module and an analysis module, the drainage module can stably lead out the hydrogen to be detected from a main pipeline, the sampling is accurately controlled, and the accuracy and safety of the sampling are ensured; the absorption module can rapidly absorb hydrogen chloride in hydrogen to form liquid to be detected, the absorption process is stable and reliable, and the accuracy of subsequent analysis is ensured; the analysis module comprises a standard liquid storage unit and an ion chromatography unit, the formed to-be-detected liquid and standard liquid can be accurately analyzed, the ion chromatography unit can accurately measure the concentration of trace hydrogen chloride, and the reliability and accuracy of a detection result are ensured.

The invention discloses a combined determination method for the tin content of iron ore, which is characterized by comprising the following steps: drawing a calibration curve; selecting measurement parameters of an instrument; weighing a sample; sample melting: uniformly mixing the weighed sample with a mixed flux in a certain proportion, and melting in a muffle furnace; extracting a sample: extracting the fused sample by using hydrochloric acid, and fixing the volume for detection; and sample determination: determining by using an inductively coupled plasma emission spectrometer, determining the intensity value of each element by drawing a standard curve method, and calculating the final content of the element according to a calibration curve made by a standard solution. The invention aims to provide the combined determination method for the tin content of the iron ore, through experiments, the accuracy of determining the standard substance and the tin element of the tin-containing iron ore can be guaranteed, and through standard recovery experiments, the recovery rate is 95% or above. The method is used for production practice, and is an effective and practical method.

The invention provides an analysis method for measuring the pH value of an aqueous solution by using methyl red, and belongs to the technical field of pH value measurement. The analysis method comprises the following steps: mixing a standard solution and a methyl red solution with different pH values to obtain a color developing solution, then detecting an absorbance curve of the color developing solution by utilizing a detection device, reading absorbance, and drawing a working curve by taking the pH value of the color developing solution as a horizontal coordinate x and the absorbance as a vertical coordinate y; mixing a to-be-detected water sample and the methyl red solution, detecting to obtain an absorbance value, substituting the absorbance value into the working curve, calculating the pH value of the to-be-detected water sample, and displaying the pH value of the to-be-detected water sample. According to the analysis method, the acid-base indicator is used as an accurate pH meter, and the pH value of the solution can be measured on line, so that the application range of the acid-base indicator is widened.

A calibration curve solution production system that produces and supplies a calibration curve solution for creating a calibration curve to a measurement device that uses the calibration curve to measure the total organic carbon concentration of a liquid to be analyzed. The system includes an analyte line that conducts the liquid to be analyzed to a TOC analyzer, a standard solution line that conducts a standard solution to the analyte line, a mixing unit installed on the analyte line that mixes the diluent and the standard solution to dilute the standard solution and supplies to the TOC analyzer the mixture of the diluent and the standard solution mixed in mixing unit as the calibration curve solution.

The invention discloses a quantitative detection method for a mixture of bis (2-hydroxyethyl) disulfide and mercaptoethanol, and relates to the field of analysis and detection. The testing method comprises the following steps: respectively preparing a bis (2-ethoxyl) disulfide standard solution and a mercaptoethanol standard solution with different concentrations; and quantitatively measuring the standard solution and the detection sample through gas chromatography equipment, optimizing chromatographic conditions, drawing a standard curve according to the detection result of the standard solution, and quantitatively analyzing the detection sample by combining the standard curve and the spectrum of the standard solution. According to the present invention, the gas chromatography conditions are optimized, the phenyl functional group-containing polysiloxane is selected as the filler of the chromatographic column, and the detection temperature and the temperature rising program are controlled so as to ensure the separation and the detector sensitivity, and the split ratio is controlled to avoid the non-linear response and the peak overlapping; the detection accuracy of the bi-component bis (2-ethoxyl) disulfide and mercaptoethanol is high, the chromatographic peak separation degree is good, and the product quality detection requirement can be met.

The application belongs to the technical field of analysis and detection, and discloses a method for continuously detecting pH value, sulfuric acid content and zinc ion content of electroplating liquid or conductive roller cleaning liquid. The method comprises the following steps: 1) selecting the "pH" block in "pH / mV" on the potential titrator, setting the instrument parameters, inserting the electrode into the to-be-detected liquid, and reading the pH value displayed by the potential titrator; 2) selecting the "mV" block in "pH / mV" on the potential titrator, selecting the dynamic pH titration mode, setting the instrument parameters, diluting the to-be-detected liquid after the pH value is detected, inserting the electrode into the diluted to-be-detected liquid, and adopting the sodium hydroxide standard solution titration, and ending the titration after two equivalent points appear; and 3) calculating the pH value, sulfuric acid content and zinc ion content of the to-be-detected liquid through a formula. The application can realize the continuous detection of the three indexes by adopting one instrument and one standard titration solution, is simple, fast and high in accuracy, and can effectively reduce the influence of chemical reagents on the health of workers.

The invention relates to the technical field of analysis and detection, in particular to a method for analyzing an aluminum element in peanut iodized oil. The analysis method specifically comprises the following steps: sample pretreatment: fully reacting a to-be-detected sample with nitric acid, treating the to-be-detected sample in a water bath environment at 80-120 DEG C for 1-2 hours, and then carrying out microwave digestion; after the digestion is completed, treating in a water bath environment at 60-80 DEG C for 1-2 hours, and fixing the volume. Performing inductively coupled plasma mass spectrometry determination: respectively adding internal standard ISTD elements with the same concentration into the standard solution, the test solution and the blank solution, and performing determination; and preparing a standard curve by using the standard solution, and calculating the concentration of the aluminum element in the test solution by using the standard curve. Compared with the prior art, the analysis method provided by the invention not only has lower requirements on the sample dosage, but also has higher accuracy and lower detection limit.

This invention provides a method for the simultaneous and rapid detection of four oxidative stress-related biomarkers and its application. The detection method includes: (S1) pretreatment of samples using a protein precipitation extract to simultaneously extract four target compounds: 8-hydroxydeoxyguanosine, 8-isoprostaglandin F2β, 8-isoprostaglandin F2α, and acetyllysine, and preparing a test solution; the protein precipitation extract is a methanol-acetonitrile-perchloric acid mixed solution containing formic acid, wherein the volume ratio of methanol, acetonitrile, and perchloric acid is (8-10):(8-10):(0.5-1), and the volume concentration of formic acid is 0.1-0.5%; (S2) detection of the test solution and standard solution using liquid chromatography-tandem mass spectrometry, and matrix calibration using an internal standard method; plotting a standard curve with the peak area ratio of the target compound to the internal standard as the ordinate and the concentration as the abscissa; and calculating the concentration of the target compound in the test solution based on the standard curve.

The invention discloses a method for measuring the content of carbonate in an industrial basic nickel carbonate substance. The method comprises the following steps: preparing a standard solution, and drawing a standard curve; weighing an industrial basic nickel carbonate sample and putting the industrial basic nickel carbonate sample into a 10ml small sample cup 1; the reaction device is adjusted, and the content of the sample carbonate in the industrial basic nickel carbonate is calculated according to the drawn standard curve; the device and the method provided by the invention are simple and convenient to operate, accurate in result and good in reproducibility, and can be used for accurately measuring the carbonate content in the industrial basic nickel carbonate sample. The method is suitable for rapid determination of carbonate in industrial basic nickel carbonate, and has good popularization and application values.

The invention discloses a method for detecting phenyl sulfide in rectification residual liquid of 2, 4-dichlorophenol through high performance liquid chromatography, and belongs to the technical field of chemical detection and analysis. The method comprises the following steps: dissolving a to-be-detected 2, 4-dichlorophenol rectification residual liquid sample to prepare a to-be-detected sample, and preparing phenyl sulfide standard substance solutions with different concentrations; the method comprises the following steps: determining a to-be-detected sample and a phenyl sulfide standard substance solution by adopting a high performance liquid chromatograph, drawing a standard curve and a linear regression equation according to a detection result of the phenyl sulfide standard substance solution, and analyzing the phenyl sulfide in the sample by combining the linear regression equation and a chromatographic peak map of the to-be-detected sample, wherein the mobile phase comprises a phase A and a phase B, the phase A is an aqueous solution of phosphate buffer salt, the phase B is methanol, and an isocratic elution mode is adopted. According to the present invention, with the method, the accurate determination of the phenyl sulfide content in the 2, 4-dichlorophenol rectification residual liquid is achieved, the timely and accurate data guidance is provided for the 2, 4-D production process, and the target of production cost saving is ultimately achieved.

The invention provides a method for determining the tin content in fuming furnace waste residues through composite alkali fusion ICP-AES, and belongs to the technical field of chemical analysis and testing. The fuming furnace waste residues to be treated are taken, a composite alkali flux is added into the fuming furnace waste residues to be treated and mixed to be uniform, and the composite alkali flux is a mixture of sodium peroxide and sodium carbonate; the method comprises the following steps: heating a mixture containing fuming furnace waste residues and a composite alkali flux to 400-700 DEG C, and carrying out gradient melting; after fusion is completed, transferring a melt into water for leaching, acidizing a product obtained by leaching, filtering, and fixing the volume of filtrate to obtain a solution to be detected; and preparing a standard solution and a blank solution, determining in an inductively coupled plasma emission spectrometer, and obtaining the tin content in the fuming furnace waste residue according to the obtained working curve. The method is applied to determination of low tin content, and the tin content in the tin-containing waste slag of the fuming furnace can be rapidly and accurately determined.

The invention discloses a liquid phase detection method of an oxime ester photoinitiator, and relates to the field of chemical analysis and detection. According to the method, a standard solution, a reaction solution to be detected and a mobile phase are prepared, a sample to be detected is subjected to pretreatment such as quenching and extraction, a high performance liquid chromatography gradient elution technology is combined to realize detection, the mobile phase adopts a phosphoric acid aqueous solution with the concentration of 0.05-0.1% and acetonitrile, a gradient elution program optimizes the separation effect, and a chromatographic column adopts a C18 stationary phase. According to the method, the separation degree of the impurities such as diester impurities in the oxime ester photoinitiator synthesis reaction is larger than or equal to 1.5, the detection limit is as low as 0.010 mg / L, the quantification limit is as low as 0.032 mg / L, the reaction process can be effectively monitored, and the method has the advantages of being easy and convenient to operate, low in cost and high in accuracy.

The application relates to a method for detecting additives in food by using pressurized capillary electrochromatography, which comprises the following steps: (1) preparation of mixed series standard solution: standard substances of benzoic acid, sorbic acid and sodium saccharin are weighed respectively, mixed standard solution is prepared by dissolving and constant volume, the mixed series standard solution is obtained by diluting in different proportions; (2) sample treatment and preparation of the liquid to be measured: the weighed food sample is diluted, constant volume is performed after ultrasonic treatment, and the sample liquid to be measured is obtained by filtration; (3) determination: the mixed series standard solution and the liquid to be measured are analyzed by using pressurized capillary electrochromatography, the standard curve is drawn according to the chromatographic peak height and the concentration of the mixed series standard solution, the chromatographic peak height of the liquid to be measured is determined, and the concentration of benzoic acid, sorbic acid and sodium saccharin in the liquid to be measured is obtained according to the standard curve. Compared with the prior art, the pressurized capillary electrochromatography is applied to the simultaneous detection of benzoic acid, sorbic acid and sodium saccharin for the first time, sample treatment is simple, the consumption of the mobile phase and the sample is small, and the detection time is short.

The invention relates to a qualitative and quantitative detection method for difluoroethylene carbonate in electrolyte, which comprises the following steps: preparing a plurality of DFEC standard solutions, selecting a chromatographic column, setting test parameters of a gas chromatograph-mass spectrometer, and detecting the prepared DFEC standard solutions. Determining a standard curve, a detection limit and a quantitation limit according to the concentration of the standard solution and the detected peak area, and forming a standard curve equation according to the standard curve; detecting the pretreated to-be-detected electrolyte to obtain the peak area of the to-be-detected electrolyte, and searching according to the standard curve to obtain the concentration of the DFEC in the to-be-detected electrolyte, or calculating according to a standard curve equation to obtain the concentration of the DFEC; according to the method disclosed by the invention, high-sensitivity and high-selectivity detection on trace DFEC in the electrolyte is realized through the synergistic effect of the gas chromatography and the mass spectrum and setting of specific test parameters.

The invention relates to the technical field of air detection, and particularly discloses a method for measuring formaldehyde content in indoor air, which is used for measuring indoor formaldehyde gas by potentiometric titration and comprises the following steps: firstly, preparing a K2Cr2O7 standard solution, a Fe < 2 + > standard solution and a formaldehyde standard solution; secondly, taking a K2Cr2O7 standard solution as an absorption liquid of formaldehyde gas, adding sulfuric acid and distilled water, heating in a water bath, transferring into a gas sampler, and sampling air to obtain a sample collection liquid; and placing the sample collection solution in a water bath kettle, continuously heating, titrating the excess K2Cr2O7 and formaldehyde blank sample by using an automatic potentiometric titrator by using a Fe < 2 + > standard solution as a titrating solution, and calculating the content of formaldehyde in the air. The method disclosed by the invention is simple to operate and accurate in determination, the reaction speed can be increased, the reaction degree can be improved, the lowest detection limit can reach 0.006 mg / m < 3 >, and the method can be used for determining the indoor formaldehyde content. The problems that in the prior art, operation is tedious, the duration time is long, and the detection limit is too high are solved.

The application provides a qualitative and quantitative detection method of polynaphthalene formaldehyde sulfonate sodium salt in a pesticide preparation, comprising the following steps: S10, solution preparation: preparing a standard sample solution, a series of concentration standard solutions and a sample solution by using pure water as a solvent; S20, chromatographic detection: adopting high performance liquid chromatography, using a C18 chromatographic column as a stationary phase, using a mixed solution of a water solution containing sodium dodecyl sulfonate and acetonitrile as a mobile phase for isocratic elution, and detecting at a wavelength of 240 nm; S30, qualitative determination: comparing the chromatographic peak retention time of the standard sample solution and the sample solution, and determining whether the polynaphthalene formaldehyde sulfonate sodium salt is contained according to the relative deviation; and S40, quantitative determination: drawing a standard curve according to the concentration and peak area of the series of concentration standard solutions, and calculating the content according to an external standard method. The application realizes accurate qualitative and quantitative determination of the polynaphthalene formaldehyde sulfonate sodium salt by combining chromatographic separation and ultraviolet detection, has the advantages of strong specificity, high accuracy, good reproducibility and simple operation, and is suitable for detection of various pesticide preparations.

The invention relates to a method for rapidly and accurately determining the content of tin in tin bronze by using ICP-AES (Inductively Coupled Plasma-Atomic Emission Spectrometry), which comprises the following steps: taking A grams of tin bronze, adding B milliliters of concentrated hydrochloric acid and C milliliters of hydrogen peroxide, and dissolving the tin bronze; after supplementing D milliliters of concentrated hydrochloric acid, adding water to fix the volume to V milliliters to obtain a sample solution with the volume fraction of hydrochloric acid being E%; mixing B milliliters of concentrated hydrochloric acid and C milliliters of hydrogen peroxide, supplementing D milliliters of concentrated hydrochloric acid, and adding water to fix the volume to V milliliters to obtain a blank solution with the volume fraction of hydrochloric acid being E%; measuring the sample solution and the blank solution by using ICP-AES (Inductively Coupled Plasma-Atomic Emission Spectrometry), and calculating the mass concentration rho1 of the sample solution and the mass concentration rho0 of the blank solution in combination with a tin standard solution working curve; based on the volume V of the sample solution, the mass A g of the tin bronze, the mass concentration rho1 of the sample solution and the mass concentration rho0 of the blank solution, the mass fraction of tin in the tin bronze is calculated. The method can improve the accuracy of the test result and the test speed.

This invention relates to the field of chemical analysis technology, specifically to an analytical method for the content of 1,1-dibromoformaldehyde oxime. The method includes the following steps: (1) dissolving the standard and the sample to be tested separately in acetonitrile to prepare standard solutions and sample solutions; (2) setting the analytical conditions of the high-performance liquid chromatograph (HPLC), and after the instrument baseline stabilizes, injecting the standard, sample to be tested, sample to be tested, and standard in sequence, calculating the average peak area of ​​1,1-dibromoformaldehyde oxime in the standard solution and sample solution respectively; (3) calculating the mass fraction of 1,1-dibromoformaldehyde oxime in the sample to be tested according to the external standard method formula. The analytical method of this invention has strong specificity, good precision, high reliability, and good repeatability, and is particularly suitable for the content analysis of 1,1-dibromoformaldehyde oxime products and for mid-control analysis during the synthesis reaction process.

The application provides a method for simultaneously detecting the content of 16 new types of brominated flame retardants in human serum, and the specific steps are as follows: S1: preparing a mixed standard solution; S2: preparing an internal standard solution; S3: drawing a standard working curve; S4: sample pretreatment: taking dichloromethane in a glass test tube, adding the internal standard solution, and blowing with nitrogen in a 40 DEG C water bath until nearly dry, then adding fetal bovine serum and pure water, and vortexing to mix; the mixed solution of dichloromethane and acetonitrile is used to form an emulsion with the sample, and after sufficient extraction of the emulsion by using a dispersing agent and an extracting agent, centrifugation is carried out at room temperature; finally, the organic precipitate phase is taken and filtered through a filter membrane to be transferred to a sample injection vial with a glass lining tube, and is left for machine detection; S5: detection and result analysis: a gas chromatograph-tandem triple quadrupole mass spectrometer is used for detecting and analyzing the content of the new types of brominated flame retardants. The method has the advantages of simple pretreatment, high sensitivity and strong practicability, and can be used for routine biological monitoring of NBFRs in the human population.