Feb 24, 2006

Comparative toxicity of cadmium, zinc, and mixtures of cadmium and zinc to daphnids

Environmental Toxicology and Chemistry
Joseph R ShawCarol L Folt

Abstract

Investigations were conducted to determine acute (48-h) effects of cadmium and zinc presented individually and in combination on Ceriodaphnia dubia, Daphnia magna, Daphnia ambigua, and Daphnia pulex. Toxicity tests were conducted with single metals to determine lethal effects concentrations (lethal concentrations predicted for a given percent [x] of a population, LCx value). These were used to derive metal combinations that spanned a range of effects and included mixtures of LC15, LC50, and LC85 values calculated for each metal and species. In single-metal tests, 48-h LC50 values ranged from 0.09 to 0.9 micromol/L and 4 to 12.54 micromol/L for cadmium and zinc, respectively. For each metal, D. magna was most tolerant and showed a different pattern of response from all others as determined by slope of concentration-response curves. In the combined metal treatments, all daphnids showed a similar pattern of response when LC15 concentrations were combined. This trend continued with few exceptions when LC15 concentrations of cadmium were combined with LC50 or LC85 values for zinc. However, when this treatment was reversed (LC15, zinc + LC50 or LC85, cadmium), responses of all species except D. magna indicated less-than-additive effe...Continue Reading

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Mentioned in this Paper

Ceriodaphnia dubia
Daphnia magna
Toxicity Tests
Daphnia ambigua
Daphnia pulex
Cryptotympana dubia
Cadmium Measurement
Landfill Leachate
Zinc
Drug Interactions

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