Abstract
At a fixed Cd 2+ concentration water hyacinth ( Eichhornia crassipes ) plants with greater root mass (dry weight) take up more metal ions as a function of time, and more metal ions are taken up by a plant as the solution volume is increased. Experiments in which several different metal ion complexers were present suggest that (1) the roots possess sites which initially reversibly bind free Cd 2+, (2) some added complexers can compete with these root sites for free Cd 2+, and (3) with time Cd 2+ bound to the roots is translocated into into the root tissues effectively removing it from the equilibrium processes in solution. Many metal ions are taken up by the plant but only the micronutrient Zn 2+ competes well with Cd 2+ for uptake. Thus, there may be binding sites on the roots for specific metal ions.
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