Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Occurrence of and Trends in Selected Sediment-Associated Contaminants in Caddo Lake, East Texas, 1940-2002.
Author Wilson, J. T. ;
CORP Author Geological Survey, Austin, TX.;Environmental Protection Agency, Dallas, TX. Region VI.
Publisher 2003
Year Published 2003
Report Number USGS-WRIR-03-4253;
Stock Number PB2004-104414
Additional Subjects Sediments ; Contamination ; Quality assurance ; Toxicity ; Trends ; Age estimation ; Cores ; Tracer techniques ; Biota
Library Call Number Additional Info Location Last
NTIS  PB2004-104414 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 08/31/2004
Collation one CD-ROM contains 96 page document
The purpose of this report is to describe the occurrence of and trends in selected sediment-associated contaminants in age-dated sediment cores from four sites in the Texas part of Caddo Lake. Radionuclides were used to age date the sediment layers in the cores, which makes possible evaluation of changes in contaminant concentrations over time. The report explains the age-dating process and associates dates of deposition with successive intervals in each core. Concentrations of selected organochlorine compounds, polycyclic aromatic hydrocarbons (PAHs), and trace elements are compared to sediment-quality guidelines that reflect relative sediment toxicity to aquatic biota. Trends based on contaminant concentrations in intervals of core sediment were tested for statistical significance. Potential sources of contaminants, particularly mercury, are discussed.