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Published in J. Environ. Qual. 34:544-551 (2005).
© ASA, CSSA, SSSA
677 S. Segoe Rd., Madison, WI 53711 USA

TECHNICAL REPORTS

Organic Compounds in the Environment

Characterization of the Pesticide Chlordane in Estuarine River Sediments

Y. Ouyanga,*, L.-T. Oub and G. C. Siguac

a Department of Water Resources, St. Johns River Water Management District, P.O. Box 1429, Palatka, FL 32178-1429
b Soil and Water Science Department, University of Florida, Gainesville, FL 32611-0290
c USDA-ARS-STARS, 22271 Chinsegut Hill Road, Brooksville, FL 34601

* Corresponding author (youyang{at}sjrwmd.com)

Received for publication July 16, 2004. Sediments are increasingly recognized as both carrier and potential source of contaminants in aquatic environments. This study investigated the characteristics and spatial distribution of total chlordane and its three most abundant compounds, including {alpha}-chlordane, {gamma}-chlordane, and trans-nonachlor, in sediments from the Cedar and Ortega rivers, Florida, USA, using geographic information system (GIS)-based kriging analyses and field measurements. Kriging analysis showed that two areas, one from the Cedar River area and the other from the northern end of the Ortega River area, were contaminated. The maximum concentrations of total chlordane, {gamma}-chlordane, {alpha}-chlordane, and trans-nonachlor in the sediments were, respectively, 101.8, 20.1, 26.3, and 19.2 µg/kg. A plot of total organic carbon (TOC)-normalized chlordane concentrations showed that effects of grain size on sediment chlordane contamination were negligible. A principal axis analysis further revealed that a linear correlation existed between {alpha}-chlordane and total chlordane as well as between {gamma}-chlordane and total chlordane, whereas no correlation existed between trans-nonachlor and total chlordane. Comparison of total chlordane concentration with Florida Sediment Assessment Guidelines showed that the Cedar River and the northern end of the Ortega River had total chlordane concentrations above the probable effect level (4.79 µg/kg), which could pose a potential risk to aquatic life.

Abbreviations: GIS, geographic information system • PAA, principal axis analysis • PEL, probable effect level • TEL, threshold effect level • TOC, total organic carbon


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