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Simultaneous determination of 109 pesticides in unpolished rice by a combination of gel permeation chromatography and Florisil column purification, and gas chromatography/mass spectrometry
Author(s) -
Zhang WeiGuo,
Chu XiaoGang,
Cai HuiXia,
An Juan,
Li ChongJiu
Publication year - 2006
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.2341
Subject(s) - chemistry , chromatography , detection limit , gel permeation chromatography , gas chromatography , selected ion monitoring , mass spectrometry , ethyl acetate , pesticide , column chromatography , gas chromatography–mass spectrometry , pesticide residue , organic chemistry , agronomy , biology , polymer
A multi‐residue method is described for the simultaneous analysis of 109 pesticides with different properties in unpolished rice. The range covers organophosphorus, organochlorine, carbamate, and synthetic pyrethroid pesticides. The pesticides were extracted from the sample using ethyl acetate. Most higher molecular weight components such as lipids in the co‐extractives were removed by gel permeation chromatography (GPC) with a Bio‐bead SX‐3 column. A Florisil column with ethyl acetate/hexane as the eluting solvents was used for further cleanup. The pesticides were finally simultaneously determined by gas chromatography/mass spectrometry (GC/MS) in selective ion monitoring (SIM) mode. The average recoveries for most pesticides (spiked level 0.02, 0.1 and 1 µg/g) ranged from 70% to 110%, the relative standard deviation (RSD) was below 20% in every case, and the limit of detection (LOD) varied from 1 to 20 ng/g. Copyright © 2006 John Wiley & Sons, Ltd.