The specific adsorption of inorganic Hg(II) species and Co(III) complex ions on goethite

Forbes, E. A.; Posner, A. M.; Quirk, J. P.

doi:10.1016/0021-9797(74)90385-3

Cited by 110 publications

(39 citation statements)

References 20 publications

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“…of the bond > S-OH. Forbes et al [22] postulated that a high degree of covalency of the bond >S-OH generally hinders the specific reaction of a particular metal ion Me to form > S-Ο -Me. This can be explained by the fact that the basicity of the hydroxyl group is reduced when the bond > S-OH has a higher degree of covalency.…”

Section: Sorption Experimentsmentioning

confidence: 99%

The Sorption of ²¹⁰Pb, ²¹⁰Bi and ²¹⁰Po on Montmorillonite: A Study with Emphasis on Reversibility Aspects and on the Effect of the Radioactive Decay of Adsorbed Nuclides

Ulrich

Degueldre

1993

Radiochimica Acta

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SummaryThe influence of the ionic strength and of pH on the adsorption/ desorption processes of Pb, Bi and Po on montmorillonite has been investigated. For Pb, a strong dependence of the adsorption and desorption processes on the ionic strength was observed at pH < 7, whereas, at higher pH values, this dependence totally disappears. The ionic medium had no influence on the sorption/ desorption of both Bi and Po. For all of these nuclides, large distribution ratios (Rj) are measured. They range from 10 3 to 10 5 ml · g" 1 for Pb and from 10 4 to 10 7 ml · g" 1 for 210 Bi and 210 Po. When adsorption and desorption coefficients are compared, an agreement is found for both adsorption/desorption Rj s of Pb, whereas, for Bi and Po adsorption R/s were several orders of magnitude lower than those obtained for desorption. The chemical activities of free Bi and Po in the liquid phase are limited by the formation of Bi and Po-colloids prior to the sorption step. This fact could explain the differences in the R d values. While the adsorption of Pb was reversible, only very small amounts of Bi and Po could be desorbed from the montmorillonite (quasi-irreversible adsorption).The radioactive decay of adsorbed 210 Pb to 210 Bi, which in turn decays to 210 Po, can lead to significant changes in the desorption behaviour of the daughter nuclides. Whereas the sorption is nearly irreversible if Bi and Po adsorb on montmorillonite from the aqueous phase, they desorb more easily if they are generated by the radioactive decay of adsorbed 210 Pb. The difference in the distribution coefficients R d is approximately one order of magnitude in the case of Po, and more than 2 orders of magnitude in the case of Bi.

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Section: Sorption Experimentsmentioning

confidence: 99%

The Sorption of ²¹⁰Pb, ²¹⁰Bi and ²¹⁰Po on Montmorillonite: A Study with Emphasis on Reversibility Aspects and on the Effect of the Radioactive Decay of Adsorbed Nuclides

Ulrich

Degueldre

1993

Radiochimica Acta

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“…If we defined the constant B in equation as the transformation rate, which were in the order PbNCuNZnNNCd. By using goethite (Forbes et al, 1974) and organic matter (Carmen and Murray, 1999) as adsorbents to investigate the metal retention on soil components, the same order of metal affinity was obtained as the transformation rate in this work.…”

Section: Comparison Of the Fractionations Among Metals And Soilsmentioning

confidence: 99%

Time effect on the fractionation of heavy metals in soils

2005

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Time effect on the fractionation of Cu, Zn, Pb, and Cd in three typical Chinese soils was investigated. A total of 500 mg kg À1 of Cu, Zn, Pb and 2.5 mg kg À1 of Cd were added to soils as nitrates. Metals in the incubated soils were fractionated termly from 3 h to 8 weeks by the sequential extraction procedure, in which the metal fractions were experimentally defined as exchangeable, carbonate-, Fe-Mn oxide-, organic matter-bound and residual fractions. Results showed that the changes of Cu, Pb and Zn in fraction distribution were biphasic by an initial rapid step followed by a slow one. Metals in exchangeable fraction were increased in the first 3 h, and then decreased, such decreases could be simulated by a diffusion equation and the decrease rate followed the order PbNCuNZnNNCd. Metals bound to Fe-Mn oxides and organic matter increased consistently in the 8-week incubation. There were almost no changes for the metals in the residual fraction. After 3-h incubation most of Cd added to soils presented in the exchangeable fraction. The content of Cd in each fraction changed slightly in the 8-week incubation. Soil pH played an important role in metal fraction distribution patterns. Jiangxi soil, with low soil pH, tended to keep more metals added in exchangeable fraction and the changes of metals in each fraction were not as remarkable as in other two soils. High organic matter content resulted in the increased organic matter-bound fraction. D

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“…First, the maximum total amount of cation adsorbed is much less for a given concentration than that of Cd 2ϩ and Zn 2ϩ (11). Second, the adsorption edge for Hg 2ϩ occurs at a lower pH (pH 3-4; Fig.…”

Section: Introductionmentioning

confidence: 98%

Surface Complexation of Hg2+ on Goethite: Mechanism from EXAFS Spectroscopy and Density Functional Calculations

Collins¹,

Sherman²,

Ragnarsdottir³

1999

Journal of Colloid and Interface Science

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The specific adsorption of inorganic Hg(II) species and Co(III) complex ions on goethite

Cited by 110 publications

References 20 publications

The Sorption of ²¹⁰Pb, ²¹⁰Bi and ²¹⁰Po on Montmorillonite: A Study with Emphasis on Reversibility Aspects and on the Effect of the Radioactive Decay of Adsorbed Nuclides

The Sorption of ²¹⁰Pb, ²¹⁰Bi and ²¹⁰Po on Montmorillonite: A Study with Emphasis on Reversibility Aspects and on the Effect of the Radioactive Decay of Adsorbed Nuclides

Time effect on the fractionation of heavy metals in soils

Surface Complexation of Hg2+ on Goethite: Mechanism from EXAFS Spectroscopy and Density Functional Calculations

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The specific adsorption of inorganic Hg(II) species and Co(III) complex ions on goethite

Cited by 110 publications

References 20 publications

The Sorption of 210Pb, 210Bi and 210Po on Montmorillonite: A Study with Emphasis on Reversibility Aspects and on the Effect of the Radioactive Decay of Adsorbed Nuclides

The Sorption of 210Pb, 210Bi and 210Po on Montmorillonite: A Study with Emphasis on Reversibility Aspects and on the Effect of the Radioactive Decay of Adsorbed Nuclides

Time effect on the fractionation of heavy metals in soils

Surface Complexation of Hg2+ on Goethite: Mechanism from EXAFS Spectroscopy and Density Functional Calculations

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Product

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The Sorption of ²¹⁰Pb, ²¹⁰Bi and ²¹⁰Po on Montmorillonite: A Study with Emphasis on Reversibility Aspects and on the Effect of the Radioactive Decay of Adsorbed Nuclides

The Sorption of ²¹⁰Pb, ²¹⁰Bi and ²¹⁰Po on Montmorillonite: A Study with Emphasis on Reversibility Aspects and on the Effect of the Radioactive Decay of Adsorbed Nuclides