Application example analysis of the hottest gas ch

2022-08-20
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Application example analysis of gas chromatograph

(I) detection of residual solvents in vegetable oil: it can be in accordance with the national standard gb/t5009 Headspace gas chromatography was used to determine the residue of solvent No. 6 in the extracted oil. Hydrogen flame ionization detector is used, packed column coated with 5% DEGs fixed liquid is installed inside, and external standard method is used for standard curve quantification. Dj-200 headspace sampler can also be used (6 headspace bottles can be placed, and the specifications of headspace bottles: 2, 10, 20ml optional). The use of headspace sampler ensures the reliability of analysis and improves the efficiency of analysis. The heated gas tight needle sleeve ensures that the sample has no dilution and condensation

(II) analysis of aldehydes, alcohols and esters in Baijiu:

using the flame ionization detector announced by the hydrogen emperor group, using 20%dnp+7% Tween-80, or the large-diameter ¢ 0.53mm special

capillary column of Lanzhou Institute of Chemical Physics, to complete the analysis of the main alcohols, aldehydes, acids and esters in Luzhou flavor Baijiu and Qingxiang Baijiu. In addition to improving the analysis efficiency, the use of capillary column can also detect organic acids, which provides more valuable information for the complex brewing and fermentation process. The analysis results fully comply with the national standard gb10345/GB10345.。

(III) gas chromatographic analysis of transformer oil pyrolysis products:

hydrogen flame ionization detector and thermal conductivity detector are adopted, Ni catalyst converter and six way valve are automatically switched, and there is no secondary diversion system, so that it can automatically analyze the transformer oil pyrolysis products (8 component gases) in one injection, with accurate quantification and high sensitivity. Microcomputer control can realize the automatic switching of fid/tcd output signals. The sampling method of oscillating degassing can be selected, and the purchased automatic headspace sampler can also be used for automatic sampling. The analysis results fully comply with the national standard GB

(IV) indoor air test (1) measurement and analysis of regenerative medicine products:

select a hydrogen flame ionization detector, coupled with a pyrolysis aspirator, a packed column or a capillary column, and select a special chromatographic column according to the national standard GB to complete the detection of benzene, toluene, xylene and total volatile organic compounds (TVOC) in indoor air. Using derivative gas chromatography, derivatization with 2.4-dinitrophenylhydrazine, extraction with cyclohexane, separation with ov-17 and qf-1 mixed coating chromatographic column, and determination of formaldehyde in indoor air with electron capture detector (ECD), compared with determination of formaldehyde by colorimetry, it has the advantages of sensitivity, accuracy, no interference, easy preservation of reagents, etc

(V) detection and analysis of tobacco and tobacco products:

TCD and FID are selected, together with special colors, in which biodegradable plastics have developed particularly rapidly. The spectral column can complete the detection of water and nicotine content in the total particulate matter of flue gas. Its method is a fast and accurate, internationally widely used advanced test method of jg149 ⑵ 003 "expanded polystyrene board thin plastering external wall external insulation system". The determination of organochlorine, organophosphorus, pyrethroid and other pesticide residues in tobacco and tobacco products can be completed by using ECD, FPD, NPD detectors with different capillary columns. Refer to national standards gb/t and gb/t

(VI) analysis of food additives and pesticide residues in food:

choosing different kinds of detectors and chromatographic columns can complete the determination of sorbic acid and benzoic acid in food (gb/t5009) Organophosphorus pesticide residues in food (GB/t5009) BHC and DDT residues in food (gb/t5009) Carbamate pesticide residues in food (GB/t5009. and gb/t5009.) Pyrethroid pesticide residues in food, used in vegetable food (GB/t5009.) And animal food (gb/t5009.). Polychlorinated biphenyls in marine products by gas chromatography (GB/t5009.). Chloropropanol in food can be determined by trichloroacetic anhydride derivatization combined with electron capture detector (ECD). Referring to gb/t, the detection of organochlorine pesticide residues in tea can be completed by using electron capture detector, capillary injection system and special large caliber capillary column

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