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An Assessment of Cadmium Availability in Cadmium-Contaminated Soils using Isotope Exchange Kinetics

Soil, Plant and Ecological Sciences Division, P.O. Box 84, Lincoln University, Canterbury, New Zealand

View larger version (18K): [in a new window]   Fig. 1. (a) Comparison between measured and short-term predicted E(t) values for Soil 71; (b) Comparison between measured and long-term predicted E(t) values for Soil 72; (c) Comparison between measured and predicted E(t) values calculated from short-term kinetics using Total or EDTA extractable Cd as an estimator of exchangeable Cd for Soil 72. Error bars are S.E.M. of triplicate determinations.

View larger version (16K): [in a new window]   Fig. 2. Relationship between Cd extracted by 1 M CaCl2 and the amount of isotopically exchangeable Cd calculated up to 24 h (E < 24). Error bars are S.E.M. of triplicate determination. The straight line is the 1:1 line.