A Probabilistic Screening Model for Evaluating Pyrethroid Surface Water Monitoring Data |
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Authors: | F Spurlock J Bacey K Starner S Gill |
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Institution: | (1) Environmental Monitoring Branch, California Department of Pesticide Regulation, California, U.S.A. |
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Abstract: | Synthetic pyrethroids have been detected in recent California surface water monitoring. Filtration is avoided during sample
workup because pyrethroids are extremely hydrophobic, tending to sorb to most surfaces. The resultant analytical pyrethroid
concentrations reflect both dissolved pyrethroid and pyrethroid associated with suspended sediment in the water column. Such
“whole-water” analytical data are not directly comparable to aquatic acute toxicity effect concentrations measured in laboratory
sediment-free water. Consequently, any potential aquatic toxicity risk is indeterminate. In this study a simple probabilistic
model was developed to allow a screening-level assessment of pyrethroid whole-water monitoring data. The results suggest that
water column toxicity of pyrethroids is possible in California's agriculturally-dominated tributaries, and indicate that additional
monitoring to better characterize pyrethroid water-column concentrations are warranted. Model refinement will depend on future
work that more firmly establishes the relationship between pyrethroid partitioning and bioavailability, and that addresses
the potential influence of dissolved organic carbon on pyrethroid sorption and bioavailability. |
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Keywords: | aquatic toxicity bioavailability pyrethroid insecticides sorption surface water suspended sediment |
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