Journal
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
Volume 78, Issue -, Pages 116-122Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ecoenv.2011.11.003
Keywords
Pyraclostrobin; QuEChERS-LC-MS/MS; Dissipation; Final residue; Peanut; Soil
Categories
Funding
- Program for Science Research for the 11th Five-year Plan, PR China [2009BADB7B03-6]
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A modified QuEChERS-LC-MS/M5 (acronym of quick, easy, cheap, effective, rugged and safe-liquid chromatography tandem mass spectrometry) method for the analysis of pyraclostrobin residue in peanut and soil was developed and validated. Pyraclostrobin residue dynamics and final residues in supervised field trials at Good Agricultural Practice (GAP) conditions in peanut and soil were studied. The limits of quantitation (LOQs) for pyraclostrobin in soil, plant, shell and peanut samples were 0.00057, 0.00026, 0.003 and 0.0037 mg kg(-1), respectively. At fortification levels of 0.005, 0.05 and 0.5 mg kg-1 in all samples, it was shown that recoveries ranged from 80.3% to 109.4% with relative standard deviations of 1.1-8.2% (n=5). The dissipation experiments showed the half-lives (T-1/2) of pyraclostrobin in soil and plants were 13.1-16.5 days and 10.3-11.2 days, respectively. At pre-harvest intervals (PHI) of 14, 21 and 28 days, pyraclostrobin residue were 0.005-0.20 mg kg(-1) in soil, 0.0060-27 mg kg(-1) in plants, below 0.053 mg kg(-1) shells and not detectable in peanuts. Crown Copyright (C) 2011 Published by Elsevier Inc. All rights reserved.
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