%0 Journal Article
%T Phosphate Sorption Characteristics onto Sediments in the Middle and Lower Reaches of the Yellow River<br>黄河中下游沉积物对磷酸盐的吸附特征
%A Wang Xiao-li
%A Pan Gang
%A Bao Hua-ying
%A Zhang Xian-wei
%A Chen Hao
%A Guo Bo-shu
%A <br>王晓丽
%A 潘纲
%A 包华影
%A 张宪伟
%A 陈灏
%A 郭博书
%J 环境科学
%D 2008
%I 
%X Abstract: The Equilibrium Phosphate Concentration (EPC0) of the Yellow River bed sediments has been measured, which was used to predict whether bed sediments are acting as a source or sink of soluble reactive phosphate (SRP). The modified Langmuir isotherm equation was used to describe phosphate (P) sorption on the Yellow River sediments. The maximum P sorption capacity (PAC) and P-binding energy constant (k) were obtained by the modified Langmuir isotherm model. Native adsorbed exchangeable phosphorus (NAP), the EPC0, and partitioning coefficients (Kp) were subsequently calculated by the corresponding formulae. The influence of pH values and ion strength were evaluated. All the EPC0s are higher than the P concentration in the overlying water, indicating a potential source of phosphate from the sediments. PAC is linearly related to the contents of TOC of the sediment. The sorption capacity of P increased rapidly with pH below 6.0, and then reached a plateau between pH 6.0 to 9.7, and finally maintained at a slightly higher level from pH 9.7 to 12.0. The adsorption of P by the sediment decreased with the increase in Ca2+ ionic strength.
%K Key words: Yellow River bed sediment
%K phosphate
%K adsorption<br>黄河沉积物
%K 磷
%K 吸附
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3FF3ABA7486768130C3FF830376F43B398E0C97F0FF2DD53&cid=A7CA601309F5FED03C078BCE383971DC&jid=64CD0AA99DD39F69401C615B85F123EF&aid=54EF28D149E5CDE65EF0D72ADCD3EBEE&yid=67289AFF6305E306&vid=771469D9D58C34FF&iid=5D311CA918CA9A03&sid=49507C87FC1E9CB1&eid=F4E0DF030AC3A199&journal_id=0250-3301&journal_name=环境科学&referenced_num=0&reference_num=15