41 results about "Quantitative analysis (chemistry)" patented technology

The invention relates to the technical field of oil gas geochemistry, in particular to a quantitative analysis method for judging petroleum degradation grade. The quantitative analysis method comprises the following steps: a sample preparation step of dehydrating a water-containing degraded oil sample and then weighing 50-100mg of the dehydrated water-containing degraded oil sample in a sample bottle; a sample degradation grade quantitative analysis step of analyzing the sample by using comprehensive two-dimensional gas chromatography-time of flight mass spectrometry; calculating the relativemass of n-isoparaffin, cyclane, arene and sterane, and terpane compound according to a peak area of a comprehensive two-dimensional gas chromatogram to be respectively denoted as A, B, C, D, and calculating an X value, wherein X=A / (A+B+C+D), the smaller the X value is, the larger the degradation grade is. The quantitative analysis method of the invention can finely divide the crude oil with the same source and the same degradation grade, thereby classifying the crude oil for geological research.

The invention relates to the field of analytical chemistry, in particular to a method for performing accurate quantitative analysis on metal elements by a patent technology combining a standard addition method and a differential method during accurate quantification. According to the analysis method, the standard addition method and the differential method are combined; a standard curve concentration calculation formula based on the differential method is designed; in combination with software calculation, a standard curve is established by using the standard addition method; the efficiency ofpreparing the standard curve is improved; and the interference caused by the matrix effect is effectively reduced, so that accurate quantification of the metal elements is realized. According to themethod, the calculated amount of preparing the standard curve by using the traditional standard addition method is greatly reduced, so that the quantitative analysis precision and speed of the harmfulmetal elements are improved; the standard addition method can replace the standard curve method (an external standard method); the accurate quantification method for the metal elements can be appliedto the detection of batch samples; and the method serves as a method for efficiently measuring the element concentration when a used instrument measures a special device without using the standard addition method.

The invention relates to a detection method for bisphenol A and bisphenol AF in food, and belongs to the technical field of analytical chemistry determination methods. It uses ionic liquid (1-butyl-3-methylimidazolium hexafluorophosphate) as the extraction agent, TritonX-100 or acetone as the dispersant, and forms an emulsion by oscillating ultrasound, and directly removes the lower layer of the extract after centrifugation drop for HPLC quantitative analysis. The invention has the advantages of simple detection steps, easy operation, low detection limit, high enrichment multiple, and greatly reduced detection cost. It is a fast, efficient and environmentally friendly pretreatment technology, and has a wider application prospect in the field of food analysis. .

The invention belongs to the technical field of analytical chemistry, and provides a detection method of glucosinolate compounds. According to the method, common secondary mass spectrum fragments of glucosinolate compounds are adopted, so that the purpose of high-efficiency qualitative analysis is achieved; in the secondary mass spectrum fragments, a set of precursor ion mode scanning qualitative method is constructed based on the fragments with m / z of 96.0, so that the detection sensitivity can be ensured, the qualitative accuracy can be improved, and false positive detection results are reduced; on the basis that the fragments with the m / z of 96.0 are used as quantitative ions, a set of multi-reaction monitoring (MRM) mode scanning quantitative method is constructed by utilizing glucosinolate compound standard substances, quantitative analysis of all glucosinolate compounds in a sample is completed, the problem that quantitative analysis cannot be achieved due to the fact that some standard substances are difficult to obtain is solved, and individual quantification and total amount determination of the compounds in the sample are efficiently completed.

The invention relates to a preparation method and application of a ratiometric fluorescent probe for detecting hydrazine. The preparation comprises the steps that phosphorus oxychloride is dissolved in dichloromethane, the mixture is slowly dropped into N,N-dimethylformamide, and after the dropwise addition is finished, cyclohexanone is added for reaction so as to obtain a compound 1; then, benzoindoles and iodoethane are dissolved in acetonitrile for heating and refluxing reaction so as to obtain a compound 2; the compound 1 and the compound 2 are subjected to heating and refluxing by takingmethylbenzene and n-butyl alcohol as solvents so as to obtain a fluorescent probe compound 3; the compound 3 is dissolved in anhydrous N,N-dimethylformamide, and sodium acetate is added for reaction under the protection condition of nitrogen so as to generate a compound 4; and the compound 4 is dissolved in anhydrous dichloromethane containing acetyl chloride, triethylamine is added for reaction for 4 hours at normal temperature under the protection of the nitrogen so as to generate the probe Ben-Cy1. ccording to the preparation method and application of the ratiometric fluorescent probe, theprobe works in a near-infrared region, is suitable for qualitative and quantitative analysis, low biotoxicity and high selectivity in biological samples and can be applied to the related fields of analytical chemistry, life organic analytical chemistry and the like.

The invention relates to a multifunctional ultrasensitive Zn 2+ Preparation method and application of fluorescent molecular probe for two-photon detection. First, product 1 is obtained by reacting 2,4-dihydroxybenzaldehyde, diethyl glutaconate and anhydrous piperidine in ethanol, and product 1 is reacted with acetic anhydride in anhydrous pyridine to obtain product 2, product 2 React with osmium tetroxide and sodium periodate in tetrahydrofuran to obtain product 3, react product 3 with anhydrous potassium carbonate in methanol to obtain product 4; finally, dissolve product 4 in ethanol, add dihydrazine pyridine and glacial acetic acid to reflux, Recrystallization and other steps, that is, the multifunctional ultrasensitive Zn 2+ Fluorescent molecular probes for two-photon detection. Suitable for Zn in biological samples 2+ It can be used in analytical chemistry, life organic analytical chemistry, disease pre-diagnosis and medical clinical testing and other related fields.

The invention discloses an analysis method for detecting impurities in aspartic acid ornithine, which belongs to the field of analytical chemistry; the method adopts liquid chromatography, amino-bonded silica gel filler, Thermo APS‑2 4.6×250mm, 5 μm, and 0.1mol / L potassium dihydrogen phosphate buffer-acetonitrile (35:65) is mobile phase A, 0.1mol / L potassium dihydrogen phosphate buffer-acetonitrile (50:50) is mobile phase B; the detection wavelength is 200nm; The flow rate is 1.0ml per minute; the column temperature is 30°C, and gradient elution is used for analysis. This technical solution can quickly and accurately detect 3‑amino‑2‑piperidone and dimer arginine in impurities aspartic acid ornithine acid, α-aspartic acid dimer, and aspartic acid condensate for qualitative and quantitative analysis, and the resolution is good, the detection limit and quantification limit are low, and the linear range is wide, so that it can be calculated more accurately The content of different impurities provides technical support for further monitoring and research of impurities in ornithine-aspartate.

The invention discloses a method for quantitatively analyzing efficiency of metalloporphyrin MOFs materials in separating CO2 / CH4. According to the method of the invention, the efficiency of the metalloporphyrin MOFs materials in separating CO2 / CH4 is quantitatively analyzed based on density functional theory calculation of auantum chemistry and Monte Carlo molecular simulation. By determining interaction energy between probe molecules and different metalloporphyrin ligands and adsorption heat, interaction between CO2 and metalloporphyrin MOFs materials is quantitatively analyzed, and finally calculation of selectivity in adsorption of CO2 / CH4 is used to characterize efficiency and features of different metalloporphyrin MOFs materials in separating CO2 / CH4. The method comprises steps of: construction of a cluster model; structural optimization of a stable structure and calculation of partial charges; calculation of a CO2 / CH4 separation coefficient; calculation of adsorption energy and adsorption heat; and analysis and characterization of efficiency in separating CO2 / CH4. According to the method of the invention, efficiency of metalloporphyrin MOFs materials in separating CO2 / CH4 can be quantitatively characterized without any actual experiment. The method of the invention can be further extended for analysis of efficiency of other porous molecular sieves of known crystal structures and MOFs materials in separating CO2 / CH4.

The present invention discloses a detection method for a polychlorinated naphthalene content in an electronic and electrical product rubber part. The method comprises the following steps: (1) crushing an electronic and electrical rubber sample to obtain a homogeneous sample; (2) adding heavy metal powder to the crushed sample, adopting an accelerated solvent extraction method to completely extract the polychlorinated naphthalene in the sample, taking the extracting solution; (3) completely transferring the extracting solution to a solid phase extraction column, adopting a mixed solvent to carry out elution, and collecting and concentrating the eluent to obtain the purified extracting solution; (4) preparing a mixed standard solution, loading the purified extracting solution and the prepared mixed standard solution on a gas chromatograph to carry out detection, adopting an electron capture detector to collect the signal, adopting a chemistry station to carry out data processing and quantitative analysis to obtain the polychlorinated naphthalene content in the electronic and electrical product rubber part. With the method of the present invention, the impurities with interference in the rubber can be effectively removed, the polychlorinated naphthalene can be completely extracted, the purification degree is high, the detection sensitivity is high and the detection cost is low.

A class of coumarin-oxacalix[3]arene fluorescent reagent and its preparation and application of the present invention belong to the field of organic synthesis and analytical chemistry. The present invention synthesizes two kinds of coumarin-oxacalix[3]arene fluorescence reagents respectively Reagent, chemical name a : 7,15,23-tri-tert-butyl-25,26,27-tri{1-[N-(7-coumarinoxyethyl)-1,2,3-triazole]-4-methyl Oxy}-3,11,19-trioxacalix[3]arene; b : 7,15,23-triethoxycarbonyl-25,26,27-tri{1-[N-(7-coumarinoxyethyl)-1,2,3-triazole]-4-methanol Oxygen}-3,11,19-trioxacalix[3]arene, and discloses the synthesis method and process conditions, the present invention uses two kinds of coumarin-oxacalix[3]arene fluorescent reagents to detect three Valence iron ion, with high selectivity and high sensitivity, can be used for qualitative and quantitative analysis.

The invention relates to a quantitative detection method for a beta crystal nucleating agent of polypropylene, which belongs to the field of analytical chemistry. The invention discloses a method for quantitatively detecting the nucleating agent of beta crystal form of polypropylene, which is to digest the nucleating agent with sulfuric acid in the presence of a catalyst. After neutralization with sodium hydroxide, the content of ammonia nitrogen was measured by Nessler's reagent spectrophotometry. The invention is applied in the field of nucleating agents for the first time, and the method does not require solvents, is simple and convenient to operate, has low requirements on the technical level of operators, short detection period, and economical cost, and is suitable for rapid and batch quantitative analysis of products on plastic processing production lines.