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| Determination of Organochlorine and Pyrethroid Pesticides in Tea by Gas Chromatography-Mass Spectrometry Using Hydroxylated Multi-walled Carbon Nanotubes as Dispersive Solid-phase Extraction Sorbent |
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| DOI： |
| KeyWord:hydroxylated multi-walled carbon nanotubes dispersive solid-phase extraction gas chromatography-mass spectrometry tea organochlorine pesticides pyrethroid pesticides |
| Author | Institution |
| RONG Jie-feng*,WEI Hang,HUANG Huo-shui,LI Yi-jun,XU Mei-zhu |
泉州出入境检验检疫局 |
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| Abstract: |
| Using modified multi-walled carbon nanotubes as sorbent in modified QuEChERS method,a rapid determination method of 24 organochlorine and pyrethroid pesticides in tea by gas chromatography-mass spectrometry was developed. Pesticides residues in tea were extracted with a hexane-acetone(2∶1) mixture,and cleaned up with hydroxylated multi-walled carbon nanotubes(MWCNTs-OH) and primary-secondary amine(PSA) as dispersive solid-phase extraction sorbent. After centrifugation and filtration,the target compounds were analyzed by gas chromatography-mass spectrometry,and quantified by the external standard method. Effects of different sorbents and extraction solvents, amount of hydroxylated multi-walled carbon nanotubes on the determination of organochlorine and pyrethroid pesticides residues were investigated. Under the optimal conditions, the calibration curves were linear in the range of 0.01-0.50mg/kg.Tests of recoveries were made by the addition of mixed standards to blank tea sample at three concentration levels, and the recoveries were in the range of 78.6%-109.6% with relative standard deviations(RSDs, n=5) of 2.1%-9.3%.The quantitation limits of method were in the range of 0.002-0.050mg/kg.The method is simple, rapid, sensitive and cheap, and could meet the requirements for the detection of organochlorine and pyrethroid pesticides in teas, particularly suitable for the application in small laboratories and enterprises. |
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