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• W2077004805 abstract "The complexation of Pb(II) on a hydrous goethite surface has been investigated. Equilibrium measurements have been performed as potentiometric titrations at 298.2 K, within the range 2.7 < −log [H+] < 8.5. Three different ionic media were used: 0.1 mol dm−3 NaNO3, 0.1 mol dm−3 NaCl, and a mixture (1:1) of both these media. The evaluation of experimental data was made, using the constant capacitance model, within which a previously determined model for the acid-base reactions was included. The formation of the following complexes within the system H+ — FeOH − Pb2+, was found to describe the surface complexation: FeOHPb2+ (logβ0,1,1,0s(int) = 8.20 ± 0.06); FeOPb+(logβ−1,1,1,0s(int) = 0.17 ± 0.04); FeOPbOH(logβ−2,1,1,0s(int) = −8.85 ± 0.08). Within the four component system H+-FeOH — Pb2+ — Cl−, the following complexes were added to the model: FeOHPbCl+ (logβ0,1,1,1s(int) = 7.50 ± 0.08); FeOPbCl(logβ−1,1,1,1s(int) = −0.35 ± 0.16); FeOPbOHCl−(logβ−2,1,1,1s(int) = −8.00 ± 0.12). In the presence of an excess of Pb(II) ions to surface binding sites, the formation of a polynuclear surface Pb(II) species is postulated. The proposed model has been verified by independent determination of total soluble Pb (II) concentrations. Model calculations, using concentrations typical for natural waters, demonstrate a strong adsorption of Pb(II) even at low concentrations of surface binding sites. The experimental data show fully reversible reactions." @default.
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• W2077004805 date "1994-11-01" @default.
• W2077004805 modified "2023-09-26" @default.
• W2077004805 title "Complexation of Pb(II) at the goethite (α-FeOOH)/water interface: The influence of chloride" @default.
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• W2077004805 doi "https://doi.org/10.1016/0016-7037(94)90225-9" @default.
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