Speaker：Benedetti Marc F, University of Paris Diderot(Paris 7), France
Time：15:00-16:10 p.m.,Jan.15th

Location：Moonlight hall,Overseas Exchange Center

Abstract
Nowadays, environmental problems related to soil and water pollution with heavy metals are numerous, therefore, it is important to understand metal ions behavior in rivers dissolved and particulate fractions, aquatic sediments and soils and to estimate their transfer. The fate of metals in the environment is closely related to their interactions with the major reactive compartments (organic matter, iron and manganese oxides, clays). The objective of this seminar is to present an approach based on the combination of laboratory data acquisition and model to study metal ion speciation in different environmental systems. The NICA-Donnan is used to describe the experimental data. First, this work implies the definition of generic parameters to describe the interactions of the studied metals with organic matter. Then, after a validation of the approach by comparison with analytical results, this model is include into a multi-surface model applied to test sites corresponding to riverine environments. These models give good predictions of the behavior of major and trace metal ions even in heterogeneous systems characteristic of natural environment. The measured free metal concentrations in the solution are in agreement with those obtained from model calculations.
Biography
Dr. Marc Benedetti is a Professor at the Department of Chemistry, University Paris Diderot, Paris, France. He has been the Head of the Aquatic Geochemistry Team IPGP-UMR 7154 since 2004. He was a Deputy Director for Sciences Affairs, University Paris Diderot from 2009-2013. Currently, he is a Deputy Director of the IPGP.
Professor Benedetti’s research concerns the interactions between major and trace elements and major constituents of water and soil in biogeochemical cycles Specifically: (1) Experimental study of processes at interfaces, understanding the mechanisms that control the speciation and transfer of elements in water and soil. He is studying the reactions of heterogeneous solid-liquid type. (2) Modelling of interactions between major and trace elements and various components of water-soil system. (3) Speciation of chemical elements in natural environments (water and soil).(4) Study of the early weathering.