Pollution d'eaux de ruissellement par les metaux lourds en zone urbaine. Deuxieme partie: Speciatton

Abstract

The speciation of cadmium, copper, lead and zinc has been studied in the particulate and the dissolved fractions of urban runoff waters. Sequential sampling has been performed during seven important rainfalls in a same residential area in 1991 and 1992. In the dissolved fraction cadmium is essentially labile, copper is present as very stable complex species, lead in stable slowly labile compounds whereas the lability of zinc species depends on the concentration of suspended solids. Particulate cadmium belongs to the “exchangeable”; fraction, copper is linked to the organic and residual fractions, lead to organic matter and “exchangeable”; fraction. Particulate zinc is shared between all fractions.

Keywords:

• Storm water
• speciation
• heavy metals
• pollution
• urban areas