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Adsorption of Mercury(II) by Iron Hydrous Oxide Gel¹

ABSTRACT

Freshly prepared iron hydrous oxide gel suspensions, 0.093M and 0.001M with respect to Fe, strongly adsorb Hg(II) from solutions containing 2.5 x 10^–5M Hg(II) and 1.0 x 10^–6M Hg(II), respectively. The pH at which 50% of the total adsorption occurred in the latter system is 4.3. In the presence of chloride (Cl/Hg(II) mole ratio of 4/1), the adsorption of Hg(II) is considerably reduced, with no significant coadsorption of ³⁶Cl, indicating that Hg(II)-Cl complexes are not adsorbed by Fe gel.

¹ Supported in part by the Res. Div. of the School of Nat. Resour. in the College of Agric. and Life Sci., Univ. of Wisconsin, Madison, under project 1336; and in part by the Ecological Sci. Branch, Div. of Biomedical and Environ. Res., U.S. Energy Res. and Dev. Administration Contract EY-76-S-02-1515-Jackson (Pap. COO-1515-64); through an International Consortium for Interinstitutional Cooperation in the Advancement of Learning (ICICAL).

² Research Fellow, Applied Geochemistry Res. Group, Imperial College, London (formerly Research Assistant, Univ. of Wisconsin, Madison, and Franklin Hiram King Professor of Soil Science, Univ. of Wisconsin, Madison, respectively.

Received for publication . Accepted for publication September 6, 1977.

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