Influence of dissolved silicic acid on the sorption of cations on oxides
Dissolved silicic acid is one of the common and major species found in natural waters, being derived from the dissolution of silicate solid phases. As silicic acid can be sorbed on mineral surfaces, its presence in solution may influence their sorption properties. In this study, the effect of sorption of silicic acid on two single oxide surfaces, magnetite and alumina, is examined and quantified. Two cations, cesium and ytterbium,were sorbed on magnetite and alumina, with and without silicic acid in solution. Yb sorbs strongly on alumina and magnetite, but the amount sorbed decreases when silicic acid is added to the solution. The sorption of Cs on the two oxide surfaces is very weak, but increases when silicic acid is added in solution. A mechanistic interpretation and complexation modeling are proposed to account for the experimental observations. The same sorption model, taking into account the sorption of silicic acid on alumina and magnetite, can be used in both cases to explain the increase in Cs uptake and the decrease ofYb sorption.
N.Marmier C.Hurel
LRSAE - Nice Institute of Chemistry- Science Faculty, University of Nice Sophia Antipolis,Nice, France
国际会议
第十二届水-岩相互作用国际研讨会(P0roceedings of the 12th International Symposium on Water-Rock Interaction)
昆明
英文
1247-1250
2007-07-31（万方平台首次上网日期，不代表论文的发表时间）