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Determination of pesticide residues in complex matrices using multi‐walled carbon nanotubes as reversed‐dispersive solid‐phase extraction sorbent
Author(s) -
Zhao Pengyue,
Wang Lei,
Luo Jinhui,
Li Jianguo,
Pan Canping
Publication year - 2012
Publication title -
journal of separation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.72
H-Index - 102
eISSN - 1615-9314
pISSN - 1615-9306
DOI - 10.1002/jssc.201100566
Subject(s) - quechers , sorbent , extraction (chemistry) , carbon nanotube , solid phase extraction , chromatography , chemistry , analyte , sample preparation , mass spectrometry , acetonitrile , pesticide , matrix (chemical analysis) , gas chromatography , gas chromatography–mass spectrometry , pesticide residue , materials science , adsorption , nanotechnology , organic chemistry , agronomy , biology
Abstract A modified quick, easy, cheap, effective, rugged and safe (QuEChERS) method with multi‐walled carbon nanotubes (MWCNTs) as a reversed‐dispersive solid‐phase extraction (r‐DSPE) material combined with gas chromatography‐mass spectrometry was developed for the determination of 14 pesticides in complex matrices. Four vegetables (leek, onion, ginger and garlic) were selected as the complex matrices for validating this new method. This technique involved the acetonitrile‐based sample preparation and MWCNTs were used as the r‐DSPE material in the cleanup step. Two important parameters influencing the MWCNTs efficiency, the external diameters and the amount of MWCNTs used, were investigated. Under the optimized conditions, recoveries of 78–110% were obtained for the target analytes in the complex matrices at two concentration levels of 0.02 and 0.2 mg/kg. In addition, the RSD values ranged from 1 to 13%. LOQs and LODs for 14 pesticides ranged from 2 to 20 μg/kg and from 1 to 6 μg/kg, respectively.