A SINGLE EXTRACTION PROCEDURE OF SOIL FOR EVALUATION OF UPTAKE OF SOME HEAVY-METALS BY PLANTS

The usefulness of single extraction solutions for assessment of the bi oavailability of some heavy metals to plants is discussed. Experimenta l data are given demonstrating the suitability of a single extraction with 0.01 mol/l CaCl2. In a field study, a close relationship was foun d between the Cd content in vegetables and its concentration in the Ca Cl2-extract. Furthermore the possibility of evaluating interelemental interaction during plant uptake by measuring different elements in the same extract is shown for Cd and Zn. The ability of the extract to re flect changes in metal binding on to the soil is shown for Ni in compe tition with Cu.