Chronic toxicity and bioaccumulation of 2,5,2′,5′- and 3,4,3′,4′-tetrachlorobiphenyl and Aroclor® 1242 in the amphipodHyalella azteca

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Abstract
The addition of 100 (μg/L of Aroclor® 1242 (A1242) or 2,5,2′,5′-tetrachlorobiphenyl (TeCB) during 10 week chronic toxicity tests withHyalella azteca resulted in complete mortality. There were no effects on survival, growth, or reproduction after addition of 30 μg/L. Toxic effects were observed at tissue levels of between 30 and 180 μg/g on a wet weight basis, and tissue levels appear to be a better indicator of toxicity than levels in water. No toxic effects were observed after additions of up to 2,700 μg/L of the coplanar congener 3,4,3′,4′-TeCB.H. azteca has the ability to avoid accumulating in excess of 140 μg/g 3,4,3′,4′-TeCB. The amount taken up was proportional to the amount added in water up to 100 μg/L, but was constant at higher additions, possibly accounting for its relatively low toxicity. The low toxicity of the coplanar congener, as compared to the non-coplanar 2,5,2′,5′-TeCB, is in direct contrast to the high toxicity of coplanar PCB congeners to mammals and may be associated with slower rates of aromatic hydrocarbon metabolism in amphipods. Polychlorinated biphenyl levels measured in amphipods from Lake Ontario are approximately 100-fold below levels associated with toxicity inH. azteca, but are above levels which, through biomagnification up the food chain, lead to salmonid residues in excess of 2 μg/g, a tolerance limit for human consumption.

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