1. Collège Louisa Paulin, F-81120 Realmont, France
2. Department of Soil Science, Jilin Agricultural University, Changchun, People's Republic of China
3. School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 lTS, UK
4. Soil-Water Geochemistry and Microbiology Laboratories, Earth Sciences - CST, University of Burgundy - INRA, 6, Boulevard Gabriel, F-21000 Dijon, France