Wet deposition of current-use pesticides in the Sierra Nevada Mountain Range, California, USA
McConnell LL, LeNoir JS, Datta S, Seiber JN. 1998. Wet deposition of current-use pesticides in the Sierra Nevada Mountain Range, California, USA. Environmental Toxicology and Chemistry. 17(10):1908–1916
Atmospheric inputs of pesticides transported from California's Central Valley to the Sierra Nevada mountains were investigated by collecting winter-spring precipitation (rain and snow) from Sequoia National Park. Pesticides currently used in California's Central Valley were detected in snow and rain samples from two elevations in Sequoia National Park (SNP) in the southern Sierras. At the lower elevation site (533 m), chlorothalonil was present at the highest levels (<0.4-85 ng/L), followed by malathion (<0.046-24 ng/L), diazinon (<0.21-19 ng/L), and chlorpyrifos (1.3-4.4 ng/L). At 1,920 m elevation, chlorothalonil was also present at the highest levels (<0.57-13 ng/L) followed by diazinon (<0.057-14 ng/L), chlorpyrifos (1.1-13 ng/L), and malathion (<0.045-6 ng/L). Trifluralin, alpha- and gamma-hexachlorocyclohexane (HCH), and alpha- and beta-endosulfan were also detected at both locations and at lower concentrations, generally ranging from 0.5 to 2 ng/L. An estimated annual loading of one chemical, chlorpyrifos, of 24 to 31 kg/year was made for the SNP land area.
- Type
- Journal Article
- Authors
- McConnell, Laura; LeNoir, James; Datta, Seema; Seiber, James
- Units
- ARD , SEKI
- Keywords
- AIRBIB, ARD_Park-Air-Info_Collection, Atmospheric transport, Contaminants, Deposition, Pesticide, Precipitation, Sierra Nevada Mountains, Toxics