Fractions of Phosphorus and Migration in Sediments in Flooded Sinkages Around Panxie Coal Mine in Huainan

SinkagePJ, GQ and XQ are the three representative subsidences flooded with water in the eastern, central and western parts of the Panxie mining in Huainan, selected as subjects for relevant research. Fractions of phosphorus in the sediments of the studied sinkages were analyzed with the modified Psenner tractional extraction method, and distributions of phosphorus fractions, organic matter (OM), total nitrogen (TN) and iron oxides and translocation and transformation of the phosphorus in the sediments were also explored, taking into account of relevant water quality parameters. It was found that physicochemical properties and phosphorus fractionation varied significantly from layer to layer in the sediment profile. A declining trend down the profile was found with OM, nitrogen, phosphorus, and various forms of iron, Among the P fractions, BD-P tended to turn into other forms of phosphorus, which was closely related to iron oxidation-reduction, and Fe-Al-P accounted for a fairly large proportion (BD-P and NaOH-P amounted to 50% of TP), which is a pool ready to release phosphorus. But at the same time, the high content of iron oxides in Panxie mining area had a strong effect inhibiting phosphorus migration.