Elsevier, Arabian Journal of Chemistry, (10), p. S1105-S1110, 2017
DOI: 10.1016/j.arabjc.2013.01.019
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Chemical speciation of copper and its total dissolved concentration in the aqueous extract of Eichhornia crassipes (E. crassipes) were investigated by DPASV titration with Cu. Values of speciation parameters, log K 0 CuLi and [L i ], were calculated using Scatchard linearization and non-linear fitting with the assumption of two complexing ligands. The total dissolved copper [Cu] T in the acid digested extract was found to be 0.48 lM ± 0.032. Results obtained from the linear and nonlinear transformations revealed that there were two classes of very strong copper complexation with average log K 0 CuL 1 $ 14:34ðAE0:01Þ, log K 0 CuL 2 $ 13:54ðAE0:04Þ, [L 1 ] $ 1.41 lM (±0.29) and [L 2 ] $ 2.08 lM (±0.1), calculated from the two methods. This reflects the great affinity of E. crass-ipes toward eliminating Cu 2+ from its aqueous environment, and converting Cu 2+ into less toxic by chelation with natural ligands released from the plant tissues. ª 2013 Production and hosting by Elsevier B.V. on behalf of King Saud University.