Organophosphate Pesticide Exposure and Residential Proximity to Nearby Fields: Evidence for the Drift Pathway

Residential proximity to pesticide-treated farmland is an important pesticide exposure pathway. In-person interviews and biological samples were collected from 100 farmworker and 100 non-farmworker adults and children living in Eastern Washington State. The authors examined the relationship of residential proximity to farmland to urinary metabolite concentrations of dimethylphosphate (DMTP) and levels of pesticide residues in house dust. DMTP concentrations were higher in farmworkers than nonfarmworkers (71 íg/L vs 6 íg/L) and in farmworker children than non-farmworker children (17 íg/L vs 8 íg/L). Compared to nonfarmworker households, farmworker households had higher levels of azinphos-Me (643 ng/g vs 121 ng/g) and phosmet (153 ng/g vs 50ng/g). The authors concluded that overall, a 20% reduction in DMTP concentration was observed per mi increase in distance from farmland. Lower OP metabolite concentrations correlated with increasing distance from farmland.

Authors: Coronado, Gloria D.; Holte, Sarah; Vigoren, Eric; Griffith, William C.; Barr, Dana Boyd; Faustman, Elaine; Thompson, Beti ;Full Source: Journal of Occupational and Environmental Medicine 2011, 53(8), 884-891 (Eng) ;