Dissolved Organic Matter in Urban Water: a Protective Role to Organisms

摘要

In aquatic systems, Dissolved Organic Matter (DOM) is an important component of the carbon cycle that controls the speciation, the bioavailability and the toxicity of trace metals (2). Studies dealing with DOM-metals interactions are mainly focused on Humic Substances (HS) (hydrophobic DOM). Nevertheless, the humic character of DOM is weaker in anthropized continental waters (about 30 % of DOC) because of various urban discharges (5; 7). Very few information are available concerning the Non Humic Substances (NHS)-metal interactions because of the very difficult isolation and purification. The present study aims to evaluate the effect of DOM fractions particularly NHS isolated from Seine Basin: urbanized and low urbanized site (1) on the copper bioavailability and toxicity and (2) on the copper and lead speciation.