Abstract
Distribution of Cd and Zn in different soil fractions was determined by the method of sequential partial extraction after Tessier on drained gley-amphigley soil in the period 1997-1999. The trial comprised three treatments with three replications: control (0.0 mg Cd and 0.0 mg Zn kg-1 soil), Cd2Zn4 (2.0 mg Cd and 4.0 mg Zn kg-1 soil) and Cd2Zn0 (2.0 mg Cd and 0.0 mg Zn kg-1 soil). Research results show significant differences in the distribution of Cd and Zn in different fractions in dependence on trial treatments and sampling time. In the control treatment, the largest part of total Cd (> 60%) was bound in the residual fraction and the Fe and Mn oxide fraction, whereas in the treatment with Cd in the exchangeable fraction (30 to 38%) and the Fe and Mn oxide fraction (35 to 41%). The highest concentration of exchangeable Cd (46.9-49.7% of total Cd) was recorded 20 days after treatment and the lowest during the last sampling, 150 days post treatment. Zinc was most abundant in the residual fraction (> 80%) regardless of trial treatments and sampling time.
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