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The European Union Water Framework Directive (WFD) requires member states to ensure that all inland and coastal waters achieve ‘good’ water quality status. To this end, the WFD has set environmental quality standards (EQS) or Water quality criteria (WQC) for priority pollutants that include the four metals Cd, Ni, Pb and Hg. Many states have also chosen to set EQS for Cu and Zn. The use of bioavailability...
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