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Determination of Pyrethroids Residues in Tea with Gas Chromatography

Hong Li

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Abstract

The article is aimed at studying the method of determining and analyzing pyrethroid pesticides in tea.The pesticide residues were extracted from tea samples by petroleum ether-acetone(V/V,3:1),and were cleaned up with the Florisil column,eluted with(V/V, 9:1),then determined with gas chromatography equipped with electron-capture detector(GC-ECD).The recoveries obtained from tea samples(n=5)added with pesticide standards at the three levels of 0.2mg/L、0.4mg/L、0.8mg/L are in the ranges of 80.7%to105.8%,with the RSDs in the ranges of 1.8%to 8.9%.The detection limits of the pyrethroids are in the range of 0.0003 to 0.0042 mg/kg.

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What this paper is about

The article is aimed at studying the method of determining and analyzing pyrethroid pesticides in tea.The pesticide residues were extracted from tea samples by petroleum ether-acetone(V/V,3:1),and were cleaned up with the Florisil column,eluted with(V/V, 9:1),then determined with gas chromatography equipped with electron-capture detector(GC-ECD).The recoveries obtained from tea samples(n=5)added with pesticide standards at the three levels of 0.2mg/L、0.4mg/L、0.8mg/L are in the ranges of 80.7%to105.8%,with the RSDs in the ranges of 1.8%to 8.9%.The detection limits of the pyrethroids are in the range of 0.0003 to 0.0042 mg/kg.

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Available abstract

The article is aimed at studying the method of determining and analyzing pyrethroid pesticides in tea.The pesticide residues were extracted from tea samples by petroleum ether-acetone(V/V,3:1),and were cleaned up with the Florisil column,eluted with(V/V, 9:1),then determined with gas chromatography equipped with electron-capture detector(GC-ECD).The recoveries obtained from tea samples(n=5)added with pesticide standards at the three levels of 0.2mg/L、0.4mg/L、0.8mg/L are in the ranges of 80.7%to105.8%,with the RSDs in the ranges of 1.8%to 8.9%.The detection limits of the pyrethroids are in the range of 0.0003 to 0.0042 mg/kg.

Key concepts: Chromatography, Pyrethroid, Chemistry, Electron capture detector, Gas chromatography, Petroleum ether, Pesticide residue, Pesticide

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