Residues, half-life times, dissipation, and safety evaluation of the acaricide fenpyroximate applied on grapes

• Published in: Toxicological and environmental chemistry Vol. 95; no. 8; pp. 1309 - 1317
• Main Authors: Malhat, Farag, El-Mesallamy, Amani, Assy, Mohamed, Madian, Walid, Loutfy, Naglaa M., Ahmed, Mohamed Tawfic
• Format: Journal Article
• Language: English
• Published: Abingdon Taylor & Francis 01-09-2013; Taylor & Francis Ltd
• Subjects: acaricide residues; Arrays; Berries; Chromium; disappearance pattern; Dissipation; Energy dissipation; Environmental chemistry; fenpyroximate; grape; Grapes; Liquids; Pesticides; Reaction kinetics; Regulations; Residues; Standard deviation; Vitaceae
• ISSN: 0277-2248; 1029-0486
• DOI: 10.1080/02772248.2013.877245

A validated high-performance liquid chromatography-diode array detector method for simultaneous determination of the acaricide fenpyroximate on grape was developed. Estimated limit of detection and limit of quantification for fenpyroximate were 0.01 and 0.05 mg kg
−1
, respectively. The intra- and inter-day precisions performed with relative standard deviation were better than 9.3% and 8%, respectively, while recoveries were in the range of 88.5%-100.4%. Residue levels of fenpyroximate in grape samples collected 10 days after field application were below the established maximum residue level values. The dissipation rates of fenpyroximate were described using first-order kinetics and its half-life, were approximately 3.5 days in grape. This study provides basic information for developing regulations to safeguard the use of fenpyroximate in grapes and prevent any potential health concerns for consumers.