Use of exposure time and life expectancy in models for toxicity to aquatic organisms

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Title Use of exposure time and life expectancy in models for toxicity to aquatic organisms
Author Connell, Des; Yu, Jimmy
Journal Name Marine Pollution Bulletin
Year Published 2008
Place of publication United Kingdom
Publisher Elsevier Ltd.
Abstract The exposure time is a variable which is usually not incorporated into models for toxicity. However, by the use of the internal concentrations as a measure of the toxicity of non-specific toxicants, rather than the ambient concentrations, this can be achieved. When the exposure time is relatively short, such as the typical exposure time of 96 hours for LC50 tests, the critical internal concentration, which is the internal concentration for lethality of aquatic organisms, is relatively constant for a particular non-specific toxicant and shows a much higher level of consistency than the LC50 measured in the ambient water. The bioconcentration process leading to the internal concentration with non-specific toxicants is a relatively well understood and predictable process. When the exposure time is relatively long, results on the measurement of the critical internal concentration with fish and crab species over different exposure times has demonstrated that the internal lethal concentration falls with increasing exposure time periods in a consistent and predictable manner. This is a reduction in the life expectancy of the test organism and so the overall biological effect is the result of two factors – internal concentration and the exposure time. A model can be developed to represent this process and used to estimate the critical internal concentration for any length of exposure periods. The model can be used to estimate chronic values of the internal concentration. It also provides information useful in assessing the risk to certain species due to the occurrence of residues of persistent non-specific toxicants in aquatic systems.
Peer Reviewed Yes
Published Yes
Alternative URI http://dx.doi.org/10.1016/j.marpolbul.2008.03.034
Volume 57
Issue Number 6
Page from 245
Page to 249
ISSN 0025-326X
Date Accessioned 2009-02-17
Date Available 2011-11-03T06:15:38Z
Language en_AU
Research Centre Atmospheric Environment Research Centre
Faculty Faculty of Science, Environment, Engineering and Technology
Subject Environmental Impact Assessment
URI http://hdl.handle.net/10072/22486
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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