Effect of temperature and salinity on the toxicity of chromium to three estuarine invertebrates (Corophium volutator, Macoma balthica, Nereis diversicolor)

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Abstract
Acute toxicity of hexavalent Cr to 3 estuarine animals (C. volutator, M. balthica, N. diversicolor) was studied at 3 temperatures (5, 10, 15.degree. C) and a range of salinities (5-40.permill., in 5.permill. increments), at time intervals of up to 384 h. Toxicity increased as temperature increased and as salinity decreased. From an analysis of variance, the significant factors and their interactions were included in a response surface model for C. volutator and M. balthica separately. The range of toxicity values for a single species under a variety of environmental conditions exceeded the previously reported range of toxicity values for several species maintained in constant conditions. Due account should be made of environmental conditions when evaluating the toxicity of Cr in the estuarine environment.
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