Oct 14, 2003

Development and field validation of a predictive copper toxicity model for the green alga Pseudokirchneriella subcapitata

Environmental Toxicology and Chemistry
Karel A C De SchamphelaereColin R Janssen

Abstract

In this study, the combined effects of pH, water hardness, and dissolved organic carbon (DOC) concentration and type on the chronic (72-h) effect of copper on growth inhibition of the green alga Pseudokirchneriella subcapitata were investigated. Natural dissolved organic matter (DOM) was collected at three sites in Belgium and The Netherlands using reverse osmosis. A full central composite test design was used for one DOM and a subset of the full design for the two other DOMs. For a total number of 35 toxicity tests performed, 72-h effect concentration resulting in 10% growth inhibition (EbC10s) ranged from 14.2 to 175.9 micrograms Cu/L (factor 12) and 72-h EbC50s from 26.9 to 506.8 micrograms Cu/L (factor 20). Statistical analysis demonstrated that DOC concentration, DOM type, and pH had a significant effect on copper toxicity; hardness did not affect toxicity at the levels tested. In general, an increase in pH resulted in increased toxicity, whereas an increase of the DOC concentration resulted in decreased copper toxicity. When expressed as dissolved copper, significant differences of toxicity reduction capacity were noted across the three DOM types tested (up to factor 2.5). When expressed as Cu2+ activity, effect levels we...Continue Reading

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Mentioned in this Paper

Organic Chemicals
Toxicity Tests
Vitreous Carbon
Copper
Water Pollutants
Chlorophyta
Selenastrum capricornutum
Lethal Dose 50
Metabolic Inhibition
Drug-Induced Liver Injury

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