Issues Relating to Sediment Toxicity Testing and Bioaccumulation of Persistent Chemicals in SRS Sediments.

Specht, W. L.

Technical Information Center Oak Ridge Tennessee

关键词: Toxicity testing;    Sediment;    Contaminants;    Chemical contaminants;    Water pollution;   

RP-ID  :  DE2005838803

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

Many chemical contaminants that enter a water body in an aqueous form are ultimately deposited to the sediments. Over time, the concentrations of contaminants in sediments may build up to concentrations that are much higher than those found in the water column. However, not all chemicals present in sediments are toxic/bioavailable. Factors that affect bioavailability include aqueous solubility, pH, redox, and composition of the sediment matrix (grain size, mineral constituents, organic matter), and for metals, the quantity of acid volatile sulfides that are present in the sediments. Many sediments contain multiple chemical contaminants, which may interact synergistically or antagonistically with respect to toxicity. Because the toxicity of a sediment cannot be determined simply by measuring the concentrations of chemical contaminants present in the sediment, laboratory toxicity testing methods have been developed to measure the toxicity and bioavailability of chemicals in sediment.