Abstract
This report discusses fractionation of phosphorus in sediment cores of Osaka Bay and the releasable fraction from sediment to sea water in anaerobic condition. Inorganic phosphate in sediment mud was fractionated into four types: soluble-P, Al-P, Fe-P, and Ca-P by the method of CHANG et al.. Concentrations of Al-P and Fe-P indicate the highest value in 0-5cm layer except for Al-P in Stn. 4 which is located at the most inner part of the bay. Ca-P contents show relatively high value for each sediment core, ranging from 110 to 190 μg per g dry mud, but area and vertical variances were not so clear. As Al-P plus Fe-P contents in the sediment increase exponentially with ignition loss, most phosphates which are associated with pollutant substances in the sediment mud are in these two fractions. Three fractions of phosphate: soluble, aluminum and iron phosphate may be released from the sediment in anaerobic condition. It was proved that contents of phosphate released into sea water increased proportionally to those three fraction contents in sediment mud.
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