Re-evaluation of metal bioaccumulation and chronic toxicity in Hyalella azteca using saturation curves and the biotic ligand model

被引:66
作者
Borgmann, U
Norwood, WP
Dixon, DG
机构
[1] Environm Canada, Natl Water Res Inst, Burlington, ON L7R 4A6, Canada
[2] Univ Waterloo, Dept Biol, Waterloo, ON N2L 3G1, Canada
关键词
biotic ligand model; Hyalella; saturation model; allometric model; metals; bioaccumulation; toxicity; mixtures;
D O I
10.1016/j.envpol.2004.02.010
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Bioaccumulation by Hyalella of all metals studied so far in our laboratory was re-evaluated to determine if the data could be explained satisfactorily using saturation models. Saturation kinetics are predicted by the biotic ligand model (BLM), now widely used in modelling acute toxicity, and are a pre-requisite if the BLM is to be applied to chronic toxicity. Saturation models provided a good fit to all the data. Since these are mechanistically based, they provide additional insights into metal accumulation mechanisms not immediately apparent when using allometric models. For example, maximum Cd accumulation is dependent on the hardness of the water to which Hyalella are acclimated. The BLM may need to be modified when applied to chronic toxicity. Use of saturation models for bioaccumulation, however, also necessitates the need for using saturation models for dose-response relationships in order to produce unambiguous estimates of LC50 values based on water and body concentrations. This affects predictions of toxicity at very low metal concentrations and results in lower predicted toxicity of mixtures when many metals are present at low concentrations. (C) 2004 Elsevier Ltd. All rights reserved.
引用
收藏
页码:469 / 484
页数:16
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