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Concentrations of selected metals obtained by sequential extraction from Btlc soil in different fractions, which can be correlated to the following putative binding forms: mobile (fraction 1), specifically adsorbed (fraction 2), bound to manganese oxides (fraction 3), bound to organic material (fraction 4), bound to amorphous Fe(III) oxides (fraction 5), bound to crystalline Fe(III) oxides (fraction 6), and bound to the residual fraction, presumably mainly silicates (fraction 7).
