Modellversuche zur Phosphatsorption von Unterwasserböden unter oxidierenden und reduzierenden Bedingungen

Model experiments on phosphate Sorption by river sediments under oxidizing and reducing conditions. During intensive reduction by sodium dithionite, phosphate sorbing river sediments often show a pronounced desorption of phosphate. Reoxidation by air causes an increase in phosphate sorption up to five times the original value, the height being linearly related to the ferric oxide content (Fe_d) of the sample. A possible explanation for this phenomenon is the oxidative precipitation of iron(III) oxides with high surface area being very active in phosphate adsorption.