Abstract
Abstract Factors influencing the uptake of Ni2+ by the water hyacinth (Eichhornia crassipes) were studied. In the concentration range of 1–1000 ppm nickel the uptake of nickel occurred in an initial rapid phase followed by a slower, near linear uptake phase. Plants subjected to multiple exposure to nickel solutions also exhibited these two uptake phases, but the ability to remove nickel from solution was reduced as the number of exposures increased Stirring the solution enhanced the uptake of nickel, suggesting that uptake was limited by diffusion. Increased root mass or solution volume increased the amount of nickel removed from solution. In the pH range of 4–10 the uptake of nickel was independent of pH. Competition with various metal ions was found to significantly reduce the uptake of nickel as did the presence of several complexing agents., Nickel initially bound to the hyacinth was partially released to a soloution containing EDTA.
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