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Retention of Arsenic by Hydroxy-Aluminum on Surfaces of Micaceous Mineral Colloids¹

ABSTRACT

This study was carried out to examine the relative significance of As retention by hydroxy-Al on external and interlamellar surfaces of micaceous mineral colloids. Depletion of K from muscovite and biotite decreased As retention. This effect was attributed to the exclusion of arsenate ions by the K-depleted layers. Hydroxy-Al in the interlamellar spaces of vermiculite and K-depleted micas was not found to contribute significantly to As retention in the solution concentration range of 2 to 10 ppm As. Changes in solution pH from near neutral to strongly acidic and variable concentrations of NaCl (0, 0.1, 1.0N) did not promote As retention by hydroxy-Al in interlamellar space of the micaceous minerals. Hydroxy-Al on the external surfaces of micaceous mineral colloids is significant in the retention of As, particularly when particle size is < 0.2µm. As the mica particles decreased in size (2–5, 0.2–2, 0.08–0.2, and < 0.08µm), the Langmuir adsorption maximum of hydroxy-Al mica complexes for As increased; whereas the bonding energy of the complexes for As decreased. The molar As/Al ratio of mineral surfaces also decreased with decreasing size of mica particles.

¹ Contribution no. R156, Saskatchewan Institute of Pedology, Dept. of Soil Science, Univ. of Saskatchewan, Saskatoon, Canada. This investigation was supported in part by National Research Council of Canada Grant A3248- and E1770-Huang and in part by Canada Department of Agriculture Grant 2029-Huang. Presented before Div. S-2, Soil Science Society of America, Las Vegas, Nevada, 12 Nov. 1973.

² Associate Professor of Soil Science.

Received for publication May 13, 1974. Accepted for publication December 9, 1974.