||pH-Dependent Toxicity of Cd, Cu, Ni, Pb and Zn to 'Ceriodaphnia dubia', 'Pimephales promelas', 'Hyalella azteca' and 'Lumbriculus variegatus'.
Schubauer-Berigan, M. K.;
Dierkes, J. R.;
Monson, P. D.;
Ankley., G. T.;
||Environmental Research Lab.-Duluth, MN. ;AScI Corp., Duluth, MN.
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||The speciation and bioavailability of metals are known to be affected by pH. Although many studies have focused on effects on metals of pH changes resulting from lake acidification (i.e., pH change 7 to 4), metal toxicity changes at higher pH values (i.e., pH 6-9) are of great interest to those performing effluent and sediment toxicity testing and toxicity identification evaluations (TIEs). In addition, most previous studies have addressed metal toxicity changes with pH to water-column organisms rather than to benthic or epibenthic species. The authors tested the acute toxicity of five metals (Cd, Cu, Ni, Pb, and Zn) to Ceriodaphnia dubia, Pimephales promelas, Hyalella azteca, and Lumbriculus variegatus at three pH values (6.3, 7.3, and 8.3) in very hard reconstituted water (hardness 300-320 mg/l as CaCO3). Toxicity of Cd, Ni, and Zn was greatest at pH 8.3 and least at pH 6.3 to most of these species. Conversely, the toxicity of Cu and Pb was greatest at pH 6.3 and least at pH 8.3 to most of the species.
||Pub. in Jnl. of Environmental Toxicology and Chemistry, v12 p1261-1266 1993. Prepared in cooperation with AScI Corp., Duluth, MN.
|NTIS Title Notes
||Reprint: pH-Dependent Toxicity of Cd, Cu, Ni, Pb and Zn to 'Ceriodaphnia dubia', 'Pimephales promelas', 'Hyalella azteca' and 'Lumbriculus variegatus'.
||68D; 57Y; 57H; 57Z; 71F
||PC A02/MF A01