黄河表层沉积物对磷的吸附与释放研究  

Adsorption and Desorption of Phosphate onto Surface Sediments from the Yellow River

作　　者：李北罡[1] 乔亚斌[1] 马钦[1] 

机构地区：[1]内蒙古师范大学化学与环境科学学院,内蒙古呼和浩特010022

出　　处：《内蒙古师范大学学报（自然科学汉文版）》2010年第1期50-54,58,共6页Journal of Inner Mongolia Normal University(Natural Science Edition)

基　　金：内蒙古自然科学基金资助项目(200711020214);内蒙古师范大学科研基金资助项目(ZRYB08019)

摘　　要：研究了黄河内蒙古包头段和喇嘛湾段沉积物对磷的吸附与释放动力学及吸附等温线,探讨了影响沉积物吸附磷的因素.结果表明:(1)各沉积物对磷的吸附不仅与沉积物种类和粒径有关,还直接受沉积物含量和初始磷酸盐浓度的影响,但这些影响各不相同.各沉积物对磷酸盐的吸附与释放均主要在前8 h内完成,在前0.5 h内无论是对P的吸附速率,还是释放速率均最快,并逐渐达到吸附及释放平衡;(2)沉积物对磷的吸附等温线很好地符合线性方程,且等温线穿越浓度轴,存在负吸附,由此获得沉积物对磷的吸附/解吸平衡质量浓度(EPC0值),分别为0.011 mg.L-1和0.022 mg.L-1.通过EPC0值判断,所研究区域沉积物表现为磷"源",有向上覆水释磷的趋势.Adsorption isotherms and adsorption-desorption kinetics of phosphate（P） onto surface sediments of Baotou and Lamawan sections taken from the Upper and Middle Reaches of the Yellow River were determined,and the impact of various factors on P adsorption was also researched.The results indicated that：（1） The P adsorption on different sediments was related not only to species and grain size of sediments,but to concentrations of sediments and beginning phosphate.Both the P adsorption and desorption process on different sediments mainly occurred within 0~8 h,the maximum adsorption and desorption rates occurred within 0~0.5 h,and then the interface interaction would gradually tend to the dynamic equilibrium;（2） P adsorption isotherms on different sediments fitted well with linear equation and isotherm curves crossed concentration axis,showing the occurrence of the negative adsorption.Based on the linear equation,P adsorption-desorption equilibrium mass concentrations（EPC0 values） on different sediments were obtained,which was 0.011 mg/L and 0.022 mg/L,respectively.These EPC0 values were higher than the P concentration in the overlying water,indicating a trend of releasing P from sediments.

关 键 词：黄河 沉积物 磷 吸附等温线 释放 

分 类 号：X131.2[环境科学与工程—环境科学]