International Journal of Soil Science1816-4978xxxx-xxxxAcademic Journals Inc.10.3923/ijss.2006.168.170LydiaLeleyterFabienneBaraud2200612In order to estimate heavy metals partitioning in soil or sediments, to evaluate their mobility and so their bioavailability, a 7-steps sequential chemical extraction procedure had been developed. But as the efficiency and selectivity of the acido-soluble extraction was now controversed, the objective of this complementary study was to show that this fraction is actually essentially composed of carbonates (as calcite or dolomite), but phosphates (as apatites) are few solubilized during this extraction step.]]>Aubert, D., A. Probst and P. Stille,2004Baruah, N.K., P. Kotoky, K.G. Bhattacharyya and G.C. Borah,1996Da Silva, I.S., A. Gilberto, L. Jaim and C.M. Jorge,2002Forstner, U. and M. Kersten,1988Gaiero, D.M., J.L. Probst, P.J. Depetris, S. Bidart and L. Leleyter,2003Kheboian, C. and C.F. Bauer,1987Kersten, M. and U. Forstner,1989Lebourg, A., T. Sterckeman, H. Ciesielski and N. Proix,1996Leleyter, L. and J.L. Probst,1999Ma, Y.B. and N.C. Uren,1998Nirel, P.M.V. and F.M.M. Morel,1990Shuman, L.M.,1985Tessier, A., P.G.C. Campbell and M. Bisson,1979Ure, A.M., C.M. Davidson and R.P. Thomas,1995