Phosphates in Soils Treated with Sewage Water: II. Fractionation of Accumulated Phosphates
1977
Beek, J. | de Haan, F. A. M. | van Riemsdijk, W. H.
Surface flooding of a sandy soil with raw domestic sewage water induced an accumulation of phosphates in the top 50-cm layers. Evaluation of the waste disposal system and development of model considerations on phosphate behavior in soil require information on the different chemical forms in which the accumulated phosphates prevail. Three different soil phosphorus fractionation methods described in literature have been applied to samples of different soil layers. Two soil treatments were involved, viz., 30 and 50 years sewage water flooding. Accumulated phosphates mainly consisted of inorganic phosphate forms (80 to 85%). These inorganic phosphates are constituted particularly of aluminum-bound phosphates; thus, indicating the dominant role of aluminum-related reactions in the phosphate-bonding mechanism in this case.
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