Abstract
Abstract A silica gel impingement plate for monitoring chlorpyrifos spray deposits in environmentally sensitive areas is described. The plate is simple, commercially available, inexpensive and easily set up. A residue analysis method is given with 97% mean recovery for chlorpyrifos deposits on the plate and a minimum quantifiable limit of 0.005 μg/plate. Chlorpyrifos deposits are strongly adsorbed to the silica gel, which prevents wash‐off by rainfall and slows degradation. In three field experiments, chlorpyrifos was readily detected 3 weeks after direct spray applications at 100, 400 and 480 g ai/ha. Chlorpyrifos dissipation on the plates was first‐order with a half‐life of 1.8–3.8 d.
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