Abstract: | Forms of phosphates in underwater soils of Ca-rich running waters Underwater soils of small carbonaceous rivers in Upper Bavaria have phosphorus contents between 300 ppm in oligotrophic creeks and more than 0.2% in heavily polluted waters. The (Al,Fe)-P and the Ca-P occupied 20–35% and 28–38% of total phosphorus (Pt) resp., so that inorganic phosphates represent 53 to 64% of Pt. The correlation between Pt and carbonate is negative, but is positive between Pt and oxalate Fe or organic substance. Addition of P results in a relative increase of (Al,Fe)-P compared with other forms. Approximately 7 to 15% of total P is subject to isotopic exchange with 32P. |