珠江广州河段上覆水和间隙水中磷的形态分布研究

Speciation Characteristics of Phosphorus in Overlying Water and Pore Water in Guangzhou Reach of Pearl River

通过研究污染比较严重的珠江广州河段(雅岗至琶洲大桥)的6个断面,共10个采样点的上覆水和间隙水的磷形态分布特征,得上覆水总磷(TP)值为0.705～3.893mg/L,均为劣吁类水质。总溶解性磷(TDP)与磷酸盐磷(PO43-)在各采样点的浓度分布不均匀,由PO43-浓度显示,各采样点已经有明显的富营养化趋势。通过分析各采样点间隙水磷浓度和引起其上、下层浓度差异的环境因素知间隙水TP与TDP有一定相关性。间隙水上、下层TP,TDP,PO43-浓度差异可能与沉积物有机质和氧化、还原环境有一定相关性,总体上认为厌氧环境有利于促进沉积物的磷释放到间隙水。

The species distribution characteristics of phosphorus in overlying water and pore water have studied in Guangzhou reach of Pearl River（from Yagang to Pazhou Bridge）. The results for 10 sampling points on six sections show that, the TP in overlying water was in the range of 0.705-3.893 mg/L,showing obvious eutrophication trend,and the concentration distribution characteristics of TDP and PO4^3- are different at each sampling point. The TP and TDP in pore water were related in certain degree. The difference between TP, TDP, and PO4^3- concentrations in pore water at upper and lower layers might been affected by the organic matter and Eh in sediment. The anaerobic environment is favorable for the release of phosphorus from sediment to pore water.