AGRO 47 |
| Although organophosphate insecticides (OP) have been the primary focus of California pesticide/water quality issues since the early 1990s, agricultural OP use is decreasing and urban uses have been nearly eliminated. Synthetic pyrethroids (SP) are OP substitutes and their use has steadily increased. SPs have recently been detected in both the water column and in bed sediments of agricultural and urban waterways. In bed sediments, concomitant bioassays have shown that acute Hyalella azteca toxicity is correlated to total SP concentrations expressed as toxic equivalents. Addressing potential SP sediment toxicity is challenging from both a scientific and regulatory standpoint due to the unique physicochemical properties of SPs and their widespread use in virtually all sectors, including urban uses. This presentation provides an overview of California SP use, SP properties relative to the general universe of pesticides, and key technical issues relevant to SP environmental exposure assessments. |
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Synthetic Pyrethroids and Surface Water Quality
8:30 AM-11:20 AM, Monday, 11 September 2006 San Francisco Marriott -- Salon 3, Oral
Division of Agrochemicals |