Toxicological characterization of Trinity River sediments.

Date

1989

Authors

Hall, J.F.

Journal Title

Journal ISSN

Volume Title

Publisher

University of North Texas.

Abstract

Sediments in the Trinity River were chemically, physically and biologically characterized and assessed for toxicity. Laboratory bioassays were conducted to identify sediments which induced toxic responses in test organisms and to document these responses through time. Metal and organic contaminant concentrations in bottom sediments were measured. Relationships between these concentrations and biological responses observed in laboratory bioassays were determined. Toxicity identification - reduction methods were used to characterized sediment toxicants. Sediment oxygen demand was also measured in resuspended and undisturbed bottom sediments through time. The Background Sediment Chemistry Approach and the Sediment Bioassay Approach were used to assess sediment quality. Sediment toxicity was observed in whole sediment bioassays using Chironomus tentans as the test species. A relationship between sediment contaminant concentration and toxicity was observed in approximately sixty percent of the sediments. Oxygen demand of suspended sediments was elevated in sediments at two locations on the river. Oxygen demand of undisturbed sediments was elevated at one location on the river. Characterization of sediment toxicants was conducted using EDTA, pH, and carbon treatments and manipulations of the sediments. Aeration tests were also used to evaluate the contribution volatile organic contaminants to observed toxicity.

Description

225 p., Dissertation

Keywords

toxicity tests, toxic effects, toxicity, sediments, sediment analysis, bioassays, Chironomus tentans, organic compounds, volatile compounds

Citation