Aqueous-, pore-water-, and sediment-phase cadmium: Toxicity relationships for a meiobenthic copepod

Autor:	Elizabeth R. Blood, Andrew S. Green, G. Thomas Chandler
Rok vydání:	1993
Předmět:	inorganic chemicals Cadmium Aqueous solution Health Toxicology and Mutagenesis Aqueous two-phase system chemistry.chemical_element Sediment Acute toxicity chemistry Environmental chemistry Toxicity Environmental Chemistry Seawater Water pollution
Zdroj:	Environmental Toxicology and Chemistry. 12:1497-1506
ISSN:	1552-8618 0730-7268
DOI:	10.1002/etc.5620120817
Popis:	Comparative effects of aqueous-, pore-water-, and sediment-phase cadmium on mortality of an infaunal laboratory-cultured copepod, Amphiascus tenuiremis, were determined using acute 96-h bioassays. Experimental design included five cadmium concentrations, three replicates per concentration, and 50 adult copepods per replicate for each of the exposures. Exposures included cadmium solubilized in seawater only (aqueous), whole sediment (i.e., pore water and sediment), and pore water only. In addition, two whole-sediment bioassays were compared in which pore-water cadmium concentrations were altered experimentally but sediment concentrations remained the same. Results of these experiments showed that for Amphiascus tenuiremis, cadmium is most toxic in the aqueous phase, less toxic in the pore-water phase, and least toxic in the sediment-bound phase. The lowered toxicity of cadmium in the pore water was most likely due to complexation of cadmium with DOC, because concentrations of DOC were six times higher in the pore-water phase than in the aqueous phase. In whole sediments, pore-water-phase cadmium was the primary source of acute toxicity, as sediment-associated cadmium contributed negligible effects.
Databáze:	OpenAIRE
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