JOINT TOXICITY OF ETHYLENEAMINES TO ALGAE, DAPHNIDS AND FISH

The joint toxicity of some ethyleneamines to Selenastrum capricornutum , Daphnia magna, and Poecilia reticulata have been determined as a con tribution to the environmental risk assessment of wastewater discharge s. A few combinations showed antagonistic or synergistic effects, but the majority of combinations were additive at the lethal level. Thus a dditivity appears to be a reasonable assumption for risk assessment pu rposes of wastewater discharges. The design of tests and the biometric al approach using models describing isobolograms to evaluate test resu lts are described in detail. This method and subsequent statistical ev aluation procedure were found to be very suitable to determine additiv ity in aquatic toxicity tests.