永定河沉积物中磷的存在形态及其指示意义

Phosphorus Speciation in Sediments of the Yongding River and Its Significance

摘要: 采集官厅水库的永定河入库口附近沉积物,采集深度77cm,以1cm做为一个层位单元进行分割,测定其中11个层位的总磷,同时对这些层位沉积物中二钙结合态磷、八钙结合态磷、铝结合态磷、铁结合态磷进行连续分级提取,有机磷通过灼烧法测定,残留态磷由总磷与上述五种形态磷差减确定。结果显示:沉积物中总磷含量在580.3~1276.2μg/g,主要成分为无机磷,平均占总磷的比例为88%;残留态磷为沉积物中磷的主要形态,含量占总磷50%以上。在沉积物深度75~20cm的沉积年份中,永定河向官厅水库输送的残留态磷量不断增加,

Abstract: Sediments were sampled near the Yongding River estuary. The sampling depth was 77 cm and was separated into 77 layers. 11 layers of samples were chosen to determine total phosphorus (TP) and the sequentially extracted Ca_(2)-P, Ca_(8)-P, Al-P, Fe-P. Org-P