Figure 1

Arsenic amount in the different extracted-fractions released by the SEP of Bagnaccio soil. (a) The following pools of soil by SEP 52 were differentiated: As soluble in MgCl2, As bound to carbonate, As bound to Mn-oxide, As bound to amorphous Fe-oxide, As bound to crystalline Fe oxide, As bound to organic matter and sulphide and residual arsenic. All analysis was performed in triplicate. Bioavailable As was counted as the sum of As soluble in MgCl2 and As bound to carbonate; (b) results are presented as the percentage of As in each soil fraction after SEP extraction.