Dissipation, residues and risk assessment of oxine-copper and pyraclostrobin in citrus

Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
Xiangwu LiuDeyu Hu

Abstract

An efficient, sensitive, simple and fast method for the simultaneous determination of oxine-copper and pyraclostrobin in citrus fruit was developed and validated. The method uses ethylene diamine tetra-acetic acid as a competitive ligand to convert oxine-copper to soluble 8-hydroxyquinoline for analysis by QuEChERS and LC-MS/MS. Linear relationships were determined with correlation coefficients ranging from 0.9904 to 0.9998. The limits of detection for the analytes were 0.012-0.8 μg kg-1, and the limits of quantitation were 0.04-2.6 μg kg-1 in citrus. The average recoveries were 79.1-114.9% with relative standard deviations of less than 7.4%. The analyses of dissipation indicated that the half-lives of oxine-copper and pyraclostrobin were 1.94-3.67 and 1.79-2.48 days and the terminal residues were <0.08-8.99 and <0.02-1.90 mg kg-1, respectively. The risk quotients of oxine-copper and pyraclostrobin were 0.026-0.199 and 0.003-0.022, respectively. This risk assessment provides a reference for the safe and reasonable use of oxine-copper and pyraclostrobin and may help to establish maximum residue limits for these pesticides in China.

References

Jul 31, 2002·Pest Management Science·Dave W BartlettBob Parr-Dobrzanski
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Oct 26, 2018·Regulatory Toxicology and Pharmacology : RTP·Shouyi WangDeyu Hu

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Citations

Jan 29, 2021·Environmental Science and Pollution Research International·Soudamini MohapatraNagapooja Yogendraiah Matadha

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