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Acid Volatile Sulfide (AVS) as instrument in the risk assessment of sediments

Acid Volatile Sulfide (AVS) als instrument bij de risicobeoordeling van waterbodems

Synopsis

Risk assessment of sediments is primarily based on the determination of total content of polluted components. Analysis of sediment composition in the Netherlands, both at present and expected in the future, shows that heavy metals, especially Zn, Cu and Ni, appear to be the main compounds determining the pollution status of contaminated sediments. The mobility of these elements is strongly reduced in the presence of an excess of sulfide (AVS). The geochemical behaviour of heavy metals in sulfide-rich sediments and the relation with ecotoxicological data, provide the basis for the AVS concept presented in this report. Although there are some further limitations attached to its exploration, the AVS concept would seem, at present, to be an effective instrument for determining the cleaning order of polluted sediments, especially in view of the fairly simple procedures to be implemented.
 

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