Binding of cadmium and copper in the mayfly Baetis thermicus larvae that inhabit a river polluted with heavy metals

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1. 1. The larvae of mayflies (Baetis thermicus) that inhabited a metal-contaminated river (the river Mazawa in Yamagata, Japan) were collected and the concentrations of several heavy metals in mayflies were compared with those inhabiting a river not contaminated with metals. 2. 2. Cadmium, copper and zinc in mayflies of the contaminated river were 13.4, 18.4 and 15.6 times higher in concentration than those in the non-contaminated river. 3. 3. Distributions of the three metals in the supernatants of the larvae collected from the contaminated and non-contaminated rivers were determined by HPLC-atomic emission spectrometry with inductively coupled argon plasma. 4. 4. Cadmium and copper in the supernatant of the larvae collected from the contaminated river were sequestered by metal-binding components induced for the respective metals, while zinc seemed to be bound loosely to native components.

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