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Aquatic risk assessment of copper in freshwater and saltwater ecosystems of South Florida

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Abstract

A screening-level aquatic risk assessment was conducted for copper in south Florida’s freshwater and saltwater environments. Risk was quantified by comparing the overlap between the probability distributions of copper exposure from surface water and sediment with the probability distributions of effects data obtained from laboratory studies. Copper concentrations in surface water and sediment in south Florida were summarized by county. For surface water, the highest concentrations of copper were found in Martin and St. Lucie counties for freshwater and saltwater, respectively. From the exposure probability distributions, the 90th centile values were estimated at 14.0 μg/L and 15.4 μg/L in freshwater and saltwater, respectively. Copper concentrations in sediment were evaluated from a probability distribution of predicted pore water concentrations. The 90th centile values of pore water concentrations from freshwater sediments ranged from 5.0 μg/L in Palm Beach County to 71.7 μg/L in Broward County. In saltwater sediments, the 90th centile values for pore water ranged from 26.1 μg/L in St. Lucie County to 27.3 μg/L in Miami-Dade County. Ecological effects data were obtained for acute and chronic copper effects in freshwater and saltwater. The 10th centile values for acute effects data were 21.2 μg/L and 9.8 μg/L for freshwater and saltwater species, respectively. For chronic effects, the 10th centile values were 3.8 μg/L and 3.9 μg/L for freshwater and saltwater species, respectively. The risk of acute copper exposure in surface water was generally low; however, the potential for ecological risk from chronic copper exposure was low to high in several counties including Lee, Martin, and St. Lucie counties. The risk of acute copper exposure in porewater from freshwater sediments also was low with the exception of St. Lucie and Broward counties. However, porewater from saltwater sediments posed a significant acute risk in Miami-Dade and St. Lucie counties. In porewater from freshwater and saltwater sediments chronic risk was high in counties with sufficient data available to calculate risk estimates.

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Acknowledgments

This studied was funded by cooperative agreement number H5297-04-0133 with Everglades National Park, U.S. Department of the Interior. This is Southeast Environmental Research Center (SERC) contribution no. 387.

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  1. Ecotoxicology and Risk Assessment Laboratory, Environmental Studies Department & Southeast Environmental Research Center, Florida International University, Biscayne Bay Campus, 3000 N.E. 151st Street, North Miami, FL, 33181, USA

    Lance J. Schuler, Tham C. Hoang & Gary M. Rand

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Schuler, L.J., Hoang, T.C. & Rand, G.M. Aquatic risk assessment of copper in freshwater and saltwater ecosystems of South Florida. Ecotoxicology 17, 642–659 (2008). https://doi.org/10.1007/s10646-008-0236-7

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