Passive sampling methods (PSMs) that measure the freely dissolved concentration (Cfree) provide an improved management tool for assessment of trace organic chemicals in water and sediment. Methods using polymer sorbents have become increasingly accepted for hydrophobic chemicals, including legacy organochlorine pesticides, however, fewer options are available for current use pesticides, some of which are moderately hydrophobic. The goal of this study was to develop lab-based PSMs to measure Cfree for pyrethroids and fipronil in sediment. Low density polyethylene (LDPE) and polymethylmethacrylate (PMMA) films were employed for sampling bifenthrin, a model pyrethroid, and fipronil, respectively. Time series incubations of different masses of LDPE and PMMA in spiked sediment slurries were performed to establish method detection limits, time to equilibrium and acceptable depletion of target chemicals ex situ. Upon standardization of the PSMs, Cfree for these pesticides will be determined for field collected sediments from southern California.

Developing passive sampling methods for bioavailable current-used pesticides in sediment

253rd National Meeting (2017)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.