淮南潘谢矿区沉陷积水区沉积物磷的赋存和迁移转化特征

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

在淮南潘谢矿区东部、中部和西部共选取潘集(PJ)、顾桥(GQ)和谢桥(XQ)3个代表性沉陷积水区进行相关研究。采用改进的Psenner分级提取方法,对研究区域内沉积物磷的剖面赋存形态进行分析,并结合相关水质参数,磷的形态组成,有机质(OM)、总氮(TN)和铁氧化物等分布特征,研究了沉陷积水区沉积物中磷的迁移转化特征。结果表明,沉积物理化指标和磷的赋存形态存在明显的层次差异,自表层向下,除游离氧化铁(Fed)以外,OM、氮磷和铁各形态含量均呈现下降趋势,其中,氧化还原敏感态磷(BD-P)向其他形态磷转化明显,与铁的氧化还原联系紧密。在磷的赋存形态中,铁铝结合态磷所占比例较大〔BD-P和金属氧化物结合态磷(Na OH-P)之和占总磷(TP)比例约为50%〕,具备了磷释放的基础条件,但同时潘谢矿区铁氧化物含量对磷的迁移起到较强的束缚作用。

Sinkage PJ,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 FeAl-P accounted for a fairly large proportion（ BD-P and Na OH-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.