Chiral and isomer-specific chlordane signatures for stormwater runoff representing various land use categories

AGRO 59

Wenjian Lao1, Keith A Maruya1, Jian Peng, jianp@sccwrp.org1, Ken Schiff1, and Jay Gan, jgan@ucr.edu2. (1) Southern California Coastal Water Research Project, Costa Mesa, CA 92626, (2) Department of Environmental Sciences, University of California Riverside, Riverside, CA 92521
Although studies have quantified contaminant loading in urban stormwater, little is known about specific land use contributions to wet weather loads. To determine if chiral signatures can be used to identify/apportion sources, we measured the enantiomer fraction (EF) and simple concentration ratios of trans- and cis-chlordane (TC/CC) in stormwater particulate material from the Newport Bay (CA) watershed. Differences in TC/CC among sites representing residential, industrial/commercial and agricultural land use were observed, with TC being preferentially depleted. For all land use categories, the (+) TC and (-) CC enantiomers were enriched relative to their antipodes. Moreover, the EF and TC/CC signatures for sites that integrate watershed runoff were consistent with a simple weighted average of those representing the major land use categories. These results suggest that chlordane signatures maybe useful in distinguishing among land use specific contributions to wet weather loads.
 

New Developments and Issues in Agrochemical Sciences
8:00 AM-11:00 AM, Monday, August 20, 2007 BCEC -- Exhibit Hall - B2, Poster

Sci-Mix
8:00 PM-10:00 PM, Monday, August 20, 2007 BCEC -- Exhibit Hall - B2, Sci-Mix

Division of Agrochemicals

The 234th ACS National Meeting, Boston, MA, August 19-23, 2007