Methods, Quality Assurance, and Data for Assessing Atmospheric Deposition of Pesticides in the Central Valley of California by William T Foreman, Celia Zamora, Michael S Majewski (Paperback / softback, 2014)
The U.S. Geological Survey monitored atmospheric deposition of pesticides in the Central Valley of California during two studies in 2001 and 2002-04. The 2001 study sampled wet deposition (rain) and storm-drain ruff in the Modesto, California, area during the orchard dormant-spray season to examine the contribution of pesticide concentrations to storm ruff from rainfall. In the 2002-04 study, the number and extent of collection sites in the Central Valley were increased to determine the areal distribution of orgaphosphate insecticides and other pesticides, and also five more sample types were collected. These were dry deposition, bulk deposition, and three sample types collected from a soil box: aqueous phase in ruff, suspended sediment in ruff, and surficial-soil samples. This report provides concentration data and describes methods and quality assurance of sample collection and laboratory analysis for pesticide compounds in all samples collected from 16 sites. Each sample was analyzed for 41 currently used pesticides and 23 pesticide degradates, including oxygen analogs (oxons) of 9 orgaphosphate insecticides. Analytical results are presented by sample type and study period.
Celia Zamora, Michael S Majewski, William T Foreman