CJCU

Chem. J. Chinese Universities ›› 2006, Vol. 27 ›› Issue (2): 227.

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Rapid Determination of Pesticide Multiresidues in Vegetable by Gas Chromatography\|mass  Spectrometry and Compensation for Matrix Effect with Protectants

HUANG Bao-Yong 1,2, PAN Can-Ping1, WANG Yi-Ru3, CAO Zhe3,
ZHANG Wei1, LI Wen-Ming1, JIANG Shu-Ren1   

  1. 1. Department of Applied Chemistry , College of Science, China Agricultural University, Beijing 100094, China;
    2. Beijing Station of Agro\|Environmental Monitoring, Beijing 100029, China;
    3. Beijing Environmental Analysis Lab, Asia\|Pacific Region, Agilent Technologies, Beijing 100083, China
  • Received:2005-04-08 Online:2006-02-10 Published:2006-02-10
  • Contact: PAN Can-Bing,E-mail:canpingp@cau.edu.cn

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Abstract:

Abstract A multi-residue method is described for rapid determination of 52 multi-class pesticides, including  their isomers, in vegetables by gas chromatography-mass spectrometry(GC-MS) with the aid of analyte protectants. Addition of different  combinations of  protectants before injection for compensation of matrix effect was demonstrated. Pesticides were extracted from samples with acetonitrile and the extract was cleaned up by using dispersive method by primary-secondary amine sorbent. Pesticides was injected into GC with the aid of analyte protectants [3-ethoxy-1,2-propanediol(20 mg/mL)and D-sorbitol(1 mg/mL)] , followed by MS detection under EI ionization and selective ion monitoring mode. Good linear and lower limits of detection were obtained, the linear range are between 0.01 and 1.00 mg/L, correlation coefficients are better than 0.98, and the detection limits are mainly between 0.2 and 9.4 μg/kg. All compounds have mean recoveries of 81.8%-119.5% and the relative standard deviation is between 0.8% and 17.6%.

Key words: KeywordsMatrix effect; Multi\, residue of pesticide; Gas chromatography-mass spectrometry(GC-MS); Analyte protectants

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