Abstract
The concentration of free metal ion (Mz+) has a strong impact on bioavailability and toxicity. In this study, Cd2+ concentration in soil solution was measured by a modified soil column-Donnan membrane technique (S-DMT). Compared with the previously reported DMT, the equilibrium time was relatively short (8 hours) and the multiple metals in the solution can be determined using ICP-AES. This technique was successfully applied in a pot experiment to evaluate Cd speciation and availability to rice. The measured Cd2+ concentration in the soil solutions agreed with the model calculation and correlated very well with the rice growth and the Cd uptake in rice.
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