ACID-BASE SURFACE CHEMISTRY AND SORPTION OF SOME LANTHANIDES ON K+-SATURATED, MARBLEHEAD ILLITE: II. A MULTISITE-SURFACE COMPLEXATION MODELING
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dc.contributor.author | Kulik D.A. | |
dc.contributor.author | Sinitsyn V.A. | |
dc.contributor.author | Aja S.U. | |
dc.contributor.author | Wood S.A. | |
dc.date.accessioned | 2021-01-29T07:11:11Z | |
dc.date.available | 2021-01-29T07:11:11Z | |
dc.date.issued | 2000 | |
dc.identifier | https://elibrary.ru/item.asp?id=13804595 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 2000, 64, 2, 195-213 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/24018 | |
dc.description.abstract | The surface reactivity and sorption of Nd and Eu onto K+-saturated, Marblehead illite has been investigated in 0.01, 0.1, and 1.0 M KCl solutions at 25°C; the potentiometric titrations were conducted using back-titration techniques. Batch experimental protocols were used in both series of studies. The ionic strength-dependent, proton surface charge density (σH) varies from −1500 to −1700 mC/m2 in 1.0 M KCl solutions and from −1800 to −2200 mC/m2 in 0.01 and 0.1 M KCl solutions. An isoelectric point was not defined by the σH vs. pH curves, which reflects the multi-phase nature of natural illitic materials. The functional dependence of REE binding constants (log Ke) on surface coverage (log ΓREE) indicates the existence of a multiplicity of energetically distinct surface types. These surface site types include amphoteric silanol and aluminol sites, basal planar surfaces, and “frayed edges”; the frayed edges are observed only in low ionic strength solutions (I ≤ 0.1 M KCl). | |
dc.title | ACID-BASE SURFACE CHEMISTRY AND SORPTION OF SOME LANTHANIDES ON K+-SATURATED, MARBLEHEAD ILLITE: II. A MULTISITE-SURFACE COMPLEXATION MODELING | |
dc.type | Статья |
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