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Method for simultaneously determining various organophosphorus in vegetable oil by combining dispersive liquid-liquid microextraction with gas chromatography

A gas chromatography and dispersion liquid-liquid technology, applied in the field of rapid determination of various organic phosphorus in vegetable oil at the same time by dispersion liquid-liquid micro-extraction combined with gas chromatography, to achieve the effect of low cost, strong application value and high sensitivity

Active Publication Date: 2021-06-25
SHANDONG INST FOR FOOD & DRUG CONTROL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the use of this technology to study organophosphorus pesticide residues in vegetable oils has rarely been reported in China.

Method used

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  • Method for simultaneously determining various organophosphorus in vegetable oil by combining dispersive liquid-liquid microextraction with gas chromatography
  • Method for simultaneously determining various organophosphorus in vegetable oil by combining dispersive liquid-liquid microextraction with gas chromatography
  • Method for simultaneously determining various organophosphorus in vegetable oil by combining dispersive liquid-liquid microextraction with gas chromatography

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1 Experimental part

[0036] 1.1 Instruments and materials

[0037] Shimadzu GC-2030 gas chromatography-flame photometric detector (GC-FPD); desktop high-speed refrigerated centrifuge (Germany Sigma). Dichlorvos, nemaphos, isodemeton-methyl, dichlorfos, parathion-methyl, fenthion, chlorpyrifos, pyrimiphos, aphidphos, protamifos, funthophos, fenfos, triazole Phosphorus, thioprofos, imophos, and saponin (all above 100 mg / L, 1 mL) were purchased from Beijing Zhenxiang Co., Ltd.; acetonitrile, acetone, methanol, ethyl acetate, n-hexyl Alkanes, 1,1,2-trichloroethane, toluene, dichloromethane, and chloroform were all chromatographically pure (Merck, Germany); N-N dimethylformamide (DMF), NaCl (Sinopharm Chemical Reagent Co., Ltd. ), corn oil, peanut oil, soybean oil, sunflower oil, and linseed oil were purchased from local supermarkets.

[0038] 1.2 Preparation of standard solution

[0039] Accurately pipette 100 μL of each pesticide standard with a concentration of 100 m...

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Abstract

The invention discloses a method for simultaneously and rapidly determining various organophosphorus in vegetable oil by combining dispersive liquid-liquid microextraction with gas chromatography, which belongs to the field of analytical chemistry. The method specifically comprises the following steps of: (1) preparing a mixed standard solution; (2) extracting a sample; (3) carrying out dispersive liquid-liquid microextraction; (4) carrying out gas chromatographic analysis; and (5) formulating a standard working curve and performing quantitative analysis. In the detection process, a large amount of organic solvent is not needed, and the method is green, environment-friendly, rapid, efficient, high in detection result sensitivity and good in reproducibility.

Description

technical field [0001] The invention belongs to the field of analytical chemistry, and relates to a method for analyzing residues of various organophosphorus pesticides in vegetable oil, in particular to a method for quickly determining various organophosphorus in vegetable oil simultaneously by means of dispersion liquid-liquid microextraction combined with gas chromatography. Background technique [0002] Vegetable oil is an essential consumer product for human life, and its quality and safety are directly related to the health of consumers. my country is a big vegetable oil consumer, with a total vegetable oil consumption of 22.35 million tons, accounting for 18% of the world's total consumption. On the one hand, pesticide residues in vegetable oil come from the control of oil crops’ own diseases and insect pests. China’s national standard GB 2763-2019 clearly stipulates the maximum residue limits of 8 organophosphorus pesticides in grains and vegetable oils; on the other...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/88
CPCG01N30/88G01N2030/884
Inventor 李芳芳陈倩倩鞠香田其燕王艳丽梁秀清李洁刘艳明王骏胡梅
Owner SHANDONG INST FOR FOOD & DRUG CONTROL
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