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Residue analysis of kresoxim‐methyl and boscalid in fruits, vegetables and soil using liquid–liquid extraction and gas chromatography–mass spectrometry
Author(s) -
Liu Xingang,
Dong Fengshou,
Qin Dongmei,
Zheng Yongquan
Publication year - 2010
Publication title -
biomedical chromatography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 65
eISSN - 1099-0801
pISSN - 0269-3879
DOI - 10.1002/bmc.1301
Subject(s) - chemistry , chromatography , residue (chemistry) , dichloromethane , extraction (chemistry) , mass spectrometry , gas chromatography–mass spectrometry , acetone , detection limit , gas chromatography , organic chemistry , solvent
A GC‐MS procedure for simultaneously determining and validating kresoxim‐methyl and boscalid has been developed in fruit, vegetable and soil matrices. The method was based on one‐step liquid–liquid extraction with acetone and dichloromethane solvents. Estimated limits of detection (LODs) for kresoxim‐methyl and boscalid were 0.006 and 0.015 mg/kg, and limits of quantification (LOQs) were 0.02 and 0.05 mg/kg, respectively. The intra‐ and inter‐ precision were achieved with RSD better than 13.8 and 14.5%, and recoveries were in the range of 77.1–98.7% for kresoxim‐methyl and 72.8–105.1% for boscalid. The expanded uncertainties calculated at 0.1 mg/kg were below 18%. Concentration levels for residues of the two fungicides in melon samples from field trials collected 7 days after the last application were clearly below the established MRL values. Copyright © 2009 John Wiley & Sons, Ltd.