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Main Title Toxicity of Cadmium in Water and Sediment Slurries to 'Daphnia magna'.
Author Schuytema, G. S. ; Nelson, P. O. ; Malueg, K. W. ; Nebeker, A. V. ; Krawczyk, D. F. ;
CORP Author Corvallis Environmental Research Lab., OR. ;Oregon State Univ., Corvallis. Dept. of Civil Engineering.
Year Published 1984
Report Number EPA/600/J-84/140;
Stock Number PB85-124493
Additional Subjects Toxicity ; Invertebrates ; Water pollution ; Daphnia ; Exposure ; Sediments ; Bioassay ; Adsorption ; Concentration(Composition) ; Cadmium ; Chemical analysis ; Ions ; Atomic spectroscopy ; Test methods ; pH ; Slurries ; Reprints ; Daphnia magna ; Water fleas
Library Call Number Additional Info Location Last
NTIS  PB85-124493 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 18p
Daphnia magna Straus were exposed to cadmium for 48 h in water and in equilibrated water sediment slurries using breakers and recirculating test chambers. Differences in toxicity based on dissolved and free cadmium (Cd(2+)) between the two levels of tested total solids 100 and 1000 mg/l, were not significant. The mean water LC50 of 39 micrograms/l total cadmium was significantly lower than the mean LC50 of 91 micrograms/l dissolved cadmium in the slurries, indicating that the cadmium adsorbed to the sediment had negligible toxicity. Low LC50 values in two sediment bioassays correspond with low pHs. Adsorption isotherms using cadmium, well water, and freshwater sediment were developed for sediment concentrations approximating those at which the bioassays were performed. Speciation results, LC50 values based on free cadmium ion concentrations only, and pH results gave indirect evidence that the free cadmium ion was the predominant toxic species to D. magna in the bioassays.