Fig. 5. Fractions of five successive extractions and residual Cu²⁺ in the total adsorbed Cu²⁺. The terms D1 to D5 represent the fraction of desorbed Cu²⁺ from each of the five successive extractions and the residual Cu²⁺ represents the fraction of adsorbed Cu²⁺ that is not recovered by the five successive extractions with 1 mol L^-1 NH₄Ac (pH 5.0). RAR, red soil developed on Arenaceous rock (clayey, mixed siliceous thermic typic Dystrochrept); REQ, red soil developed on Quaternary red earths (clayey, kaolinitic thermic plinthite Aquult).

Return to article