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ACUTE TOXICITY OF AQUEOUS AND CHIRNONOMUS DECORUS
Citation:
Kosalwat, P. AND A. Knight. ACUTE TOXICITY OF AQUEOUS AND CHIRNONOMUS DECORUS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-87/541 (NTIS PB91146324), 1987.
Description:
Fourth instar larvae of the midge, Chironomus decorus, were exposed copper in water and copper in food and substrate (bound forms). opper present in aqueous forms was more toxic than when it was present in bound forms. he relationship between copper in water and copper in midges could be described by an exponential equation while the relationship between copper in substrate and midges was best described by a simple linear regression equation. idge larvae accumulated copper from water and possessed some mechanisms to regulate copper uptake and excretion when exposed to copper concentrations of 0.05-1.0 mg/L(aqueous forms) and lost that ability when the concentration exceeded 1.0 mg/L. n the contrary, the midge larvae were unable to accumulate copper from food, since the estimated bioconcentration factor was between 0.10 and 0.16. When the midge larvae were exposed to copper in water, the uptake rate increased rapidly from 0-10 hr and then the rate increased very slowly or in some cases it reached a steady state after 10 hr. he steady state was attained within 1 to 3 hr when the midges were exposed to copper in food and substrate.
