An impingement plate method to detect aerial deposits of chlorpyrifos
Titel:
An impingement plate method to detect aerial deposits of chlorpyrifos
Auteur:
Hill, B. D. Inaba, D. J.
Verschenen in:
Journal of environmental science and health. Part B, Pesticides, food contaminants, and agricultural wastes
Paginering:
Jaargang 25 (1990) nr. 4 pagina's 415-432
Jaar:
1990-08
Inhoud:
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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