Proton consumption and release of organic‐cabon,silicate, and sulfate by anion sorption on andosols

Abstracts

Three anion (selenite, phosphate, and fluoride) sorption, and the concomitant release of silicate, sulphate, and organic matters from soils, and proton consumption with sorption were investigated using two andosols in Japan. The following sequence of sorption by the andosols was, fluoride (F) >> phosphate (P) > selenite (Se); concomitant proton consumption with sorption, F >> P > Se; organic matter released, P > Se > F; and sulfate released, P > Se >> F. There was quite a difference between an allophanic and a non‐allophanic andosols in silicate released with anion sorption. Our results suggest that the fluoride sorption mechanism is different from the others and that surface sites with OH groups for inner‐sphere complexes with selenite on soil particles which are restricted as compared to phosphate and fluoride.