Pesticides are commonly treated on residential outdoor surfaces but their levels were seldom directly measured. This lack of information hampered the evaluation of their contamination and environmental impacts. We chose 40 homes from two neighborhoods, collected solid particles (> 0.7 �m) on their outdoor surfaces for three times, and analyzed concentrations of 15 compounds. Pesticides were ubiquitously found, and > 75% samples contained less than five pesticides. Median concentrations of total pesticides were above 45 �g kg-1 for both neighborhoods and three sampling months. The most seen pyrethroids were bifenthrin, permethrin, cyfluthrin and cypermethrin, and in 54 % particle samples bifenthrin and permethrin contributed > 50 % of total pesticides. Fipronil sulfone concentrations were higher than parent fipronil. US EPA SWMM model revealed particles on impervious surfaces are not only carriers but also important source of pyrethroids in residential runoff, and ArcGIS showed pesticide accumulation on outdoor surfaces due to dry weather and great summer use.

Pesticide occurrence in particles on residential outdoor surfaces

248th National Meeting (2014)

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