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Toxicity of Alkalinity to Hyalella azteca

Toxicity of Alkalinity to Hyalella azteca Bull. Environ. Contam. Toxicol. (1997) 59:807-814 P. J. Lasier,1 P. V. Winger,1 R. E. Reinert2 1 United States Geological Survey, United States Department of the Interior, Patuxent Wildlife Research Center-SERG, Athens, Georgia 30602, USA 2 University of Georgia, D.B. Warnell School of Forest Resources, University of Georgia, Athens, Georgia 30602, USA Received: 27 May 1997/Accepted: 22 August 1997 Toxicity testing and chemical analyses of pore water have been suggested for inclusion in the process of sediment quality assessment (USEPA 1994a) and for use in sediment toxicity identification evaluation procedures (Ankley and Schubauer-Berigan 1995). Incorporation of pore water into sediment evaluations has been prompted by the understanding that bioavailability of sediment contaminants is primarily through exposure to the pore water (Burton 1991). However, interpretation of porewater toxicity is highly dependent upon the porewater chemistry. Inherent chemical characteristics and rapid shifts in chemical equilibria associated with the oxidation of freshly-extracted pore water confound the relationship between porewater chemistry, contaminant availability and toxicity (Lasier 1995). For example, high concentrations of alkalinity, which are typical of sediment pore water from many regions, can be toxic to test animals (Cowgill and Milazzo 1991; Hoke et al. 1992). In research with cladocerans, Hoke et http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Bulletin of Environmental Contamination and Toxicology Springer Journals

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