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Occurrence and Bioavailability of Pyrethroids in a Mixed Land Use Watershed

^a Dep. of Environmental Sciences, Univ. of California, Riverside, CA 92521
^b Univ. of California Cooperative Extension, Orange County, Costa Mesa, CA 92626

View larger version (47K): [in this window] [in a new window]   Fig. 1. Site locations for sediment collection within the San Diego Creek Watershed in Orange County, CA.

View larger version (21K): [in this window] [in a new window]   Fig. 2. Concentrations of pyrethroid insecticides in dry season sediments. (A) Study sample sites excluding nursery outlets; and (B) nursery outlet sites.

View larger version (27K): [in this window] [in a new window]   Fig. 3. Concentrations of pyrethroid insecticides in wet season sediments. (A) Study sample sites excluding nursery outlets; and (B) nursery outlet sites. Note: Samples were not collected at Site 16 during this sampling period.

View larger version (9K): [in this window] [in a new window]   Fig. 4. Bifenthrin organic carbon-normalized sediment concentration vs. the freely dissolved pore water concentration (Cfree) measured by solid phase microextraction (SPME) for dry and wet season sediments. Triangles are dry season samples, and diamonds are wet season samples.