PWG has compiled an extensive database of measured concentrations and related information for synthetic pyrethroid residues in ambient sediment and water column samples. Data are obtained from open literature publications, unpublished reports, and public databases (e.g., California Department of Pesticide Registration’s Surface Water Database [SURF]) and compiled in a Microsoft® Excel spreadsheet.
The database currently contains more than 90,000 individual analytical results for the nine pyrethroid active ingredients of interest (bifenthrin, cyfluthrins, cyhalothrins, cypermethrins, deltamethrin, esfenvalerate, fenpropathrin, permethrin, and tefluthrin) with the majority of the data coming from California.
Key metrics recorded include sample location and date, sample type, water body type, watershed use, analytical method and reporting limit, organic carbon concentrations, and quality assurance/quality control approach. Geographical coordinates are included where possible, enabling spatial analysis that can be conducted in a geographic information system (GIS) and integrated with other spatial datasets such as hydrology, soils, weather, and crop layers. Calculated freely-dissolved (bioavailable) concentrations in water are provided based on best-available partition coefficients. The curated database provides an important resource for quantifying pyrethroid concentrations in aquatic habitats and for evaluating the results of exposure modeling. The data can be analyzed to determine the distribution and co-occurrence of pyrethroid residues in sediment and surface water as a function of sample type, water body type, watershed use, and geographic area.
This PWG monitoring database continues to be updated with newly available data and additional information.
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