南淝河表层沉积物有机磷含量及形态分布特征

Distribution Patterns of Different Organic-phosphorus Fractions in the Surface Sediment from the Nanfei River

[目的]明确南淝河不同采样点底泥中不同形态有机磷沿程分布特征。[方法]以典型城市重污染水体—南淝河城区段表层沉积物为研究对象,采用修正的Bowman-Cole方法考察了有机磷(OP)不同形态[包括活性有机磷(LOP)、中稳性有机磷(MSOP)、高稳性有机磷(HSOP)和中活性有机磷(MLOP)]的分布特征。[结果]在南淝河城区段表层沉积物中,MLOP与LOP含量较高,且MLOP为有机磷的主要形态。同时,沉积物中TOC含量影响了沉积物中有机磷形态特征,TOC含量较高,MLOP与LOP含量也随之增加。[结论]南淝河沉积物中,MLOP与LOP的含量较高,具有较大的潜在生态风险,且有机质对MLOP与LOP的影响较明显。

[Objective]The aim was to clear distribution patterns of different organic-phosphorus fractions in the surface sediment from the Nanfei River.[Method]Distribution patterns of different organic-phosphorus fractions in the surface sediment from the Nanfei River,a typical urban heavily polluted water body,were fractioned into labile organic phosphorus(LOP),moderately stabilized organic phosphorus(MSOP),highly stabilized organic phosphorus(HSOP)and moderately labile organic phosphorus using modified Bowman-Cole method.[Result]The content of MLOP and LOP in surface sediment of Nanfei River was high,and MLOP was the main form of organic-phosphorus.Meanwhile,the content of TOC in the sediments affected the morphological characteristics of organic-phosphorus in the sediments.With higher TOC content,the content of MLOP and LOP also increased.[Conclusion]The above results indicated that the content of MLOP and LOP in sediments of Nanfei River is high,which has a great potential ecological risk.Moreover organic matter has a significant effect on the two organic phosphorus forms of MLOP and LOP.