Scientists urge use of bioassays in water pollution control

Water samples from the Tyne and Tees estuaries have been shown to be acutely toxic in oyster bioassay tests, probably because of the additive effects of pollutants, a Ministry of Agriculture (MAFF) research project has concluded.1 The study recommends that the technique should be used more widely to detect additive effects of pollutants from different discharges when consent limits are being set, and to identify problem areas in which expensive chemical analysis techniques can be effectively focused.

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