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- W2181676731 abstract "The bioproductivity of aquatic ecosystems is, in most cases, controlled by the dissolved mineral phosphorus concentration. This concentration is a function of many factors; in particular, it depends on the dissolution, sedimentation, and transformation of phosphorus compounds contained in the particulate matter and bottom sediments. Iron and aluminum phosphates, from monometal phosphates FePO 4 and AlPO 4 to mixed-metal hydroxophosphates Me(I) x Me(II) y Fe(III)(PO 4 ) q (OH) z and Me(I) x Me(II) y Al(PO 4 ) q (OH) z , which contain hydrogen ions, alkali elements, and alkaline-earth elements, are among the most abundant phosphorus minerals [1‐6 and others]. The thermodynamic properties of the mixed-metal phosphates are not well understood, which makes it difficult to elucidate the role they play in phosphorus geochemistry in the hypergenesis zone. In high-acidity soils confined to humid regions, phosphorus is significantly associated with iron and aluminum [1]. Since most of the river sediments are formed via washout of the soil cover, we suggest that the solubility of mixed-metal iron and aluminum hydroxophosphates controls the mineral phosphorus concentration in the continental discharge, including the mixing zone of river and sea water. Terrigeneous iron and aluminum hydroxophosphates are expected to be unstable in sea water because of, first, an increase in pH and the attendant displacement of the phosphates by hydroxide ions and, second, a rise in the dissolved calcium concentration (leading to the formation of apatite phases, which are typical of oceanic sediments). This expectation is confirmed by Dubinin’s natural observations [7]. Dubinin showed that iron calcium hydroxophosphates found in pelagic oceanic sediments decompose in the course of diagenesis to yield more stable iron oxide hydroxides and apatite. In this communication, we report on the experimental study of the interaction of iron and aluminum phosphates with river and seawaters. The results of this study highlight some details of the chemical transformation of these compounds at the river‐sea geochemical barrier. EXPERIMENTAL" @default.
- W2181676731 created "2016-06-24" @default.
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- W2181676731 date "2005-01-01" @default.
- W2181676731 modified "2023-09-27" @default.
- W2181676731 title "Experimental Study of the Transformations of Iron and Aluminum Phosphates at the River-Sea Geochemical Barrier" @default.
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