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Journal of Chemistry
Volume 2015 (2015), Article ID 623847, 6 pages
http://dx.doi.org/10.1155/2015/623847
Research Article

Dissipation and Residues of Thiram in Potato and Soil

1Department of Applied Chemistry, College of Science, China Agricultural University, Beijing 100193, China
2Hunan Plant Protection Institute, Changsha, Hunan 410125, China
3Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou 310008, China

Received 10 December 2014; Revised 15 March 2015; Accepted 15 March 2015

Academic Editor: David Bongiorno

Copyright © 2015 Shaowen Liu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The residue levels of thiram during potato cultivation in open field were evaluated. Thiram residues were determined by methylation derivation method with high performance liquid chromatography (HPLC). Wettable powder (WP) formulation containing 25% thiram was applied at 2320 g active gradient hm−2 (a.i. hm−2) dosage for the dissipation study. The decline rate in potato leave and soil followed first-order kinetics equation, and the half-life ranged from 2.8 to 5.4 days and 2.6 to 9.9 days, respectively. In terminal residue, the thiram was sprayed at 580 g a.i. hm−2 (low concentration, recommended dosage) and 1160 g a.i. hm−2 (high concentration, double of recommended dosage). The residues of thiram in potato and soil samples collected in the field at preharvest interval of 21 days and 30 days were all below 0.02 mg kg−1. The results show that thiram possesses low dietary risk in potato at harvest according to supervised residue field trial. It may be safe when used at recommended rate of application.