Volatilization, Off-Site Deposition, Dissipation, and Leaching of DCPA (Dimethyl 2,3,5,6-Tetrachloroterephthalate) in the Field

摘要

The California Department of Food and Agriculture (CDFA) routinely analyzes produce samples to ensure that they do not contain pesticide residues exceeding established tolerance levels. For the past few years, residues of the herbicide dimethyl 2,3,5,6-tetrachloroterephthalate (DCPA) have been found repeatedly on a variety of produce samples to which it had not been applied. Due to the occurrence of DCPA residues on parsley and other produce, and subsequent economic impact on growers, an investigation into the mechanism of off-target contamination was undertaken.