沉积物不同有机矿质复合体对磷的吸附特征影响  

Effect of organo–mineral complexes on adsorption characteristic of phosphorus on sediment

作　　者：王而力[1] 王嗣淇[1] 江明选 

机构地区：[1]辽宁工程技术大学环境科学与工程学院,辽宁阜新123000 [2]阜新市环境监测中心站,辽宁阜新123000

出　　处：《中国环境科学》2013年第2期270-277,共8页China Environmental Science

基　　金：辽宁省教育厅科研项目(20060391)

摘　　要：采用平衡吸附法研究了西辽河沉积物不同有机矿质复合体对磷的吸附特征影响.结果表明,去除腐殖质后的沉积物对磷的吸附能力大大降低,其饱和吸附量(Гm)和吸附分配系数(k)分别只能达到原样的35.62%和9.93%,有机矿质复合体是影响磷在沉积物上吸附特征的主要因素;沉积物中的钙键有机矿质复合体对磷具有孔隙填充方式的吸附,其碳标化饱和吸附量为1157.05mg/kg,相当于原样的1.27倍;沉积物中的铁铝键有机矿质复合体在对磷吸附中发挥重要作用,其碳标化饱和吸附量可达1736.82mg/kg,相当于原样的1.88倍.其吸附机制除孔隙填充方式外,还存在配位吸附;考查沉积物对磷的吸附能力不但要考虑腐殖质的含量,更要考虑腐殖质的复合形态,它也是影响沉积物对磷吸附特征的重要因素.以原样为基准,钙键有机矿质复合体、铁铝键有机矿质复合体携载的吸附态磷可分别按1.27和1.88倍进行估算.Effect of organo-mineral complexes on adsorption characteristic of phosphorus on sediment was investigated by batch experiments of equilibrium adsorption. Results indicated that the sorption capacity on the sediment reduced dramatically after humus was removed, Normalized sorption capacity and partition coefficient only accounted for 35.62% and 9.93% of original sample, and organo-mineral complexes was a main factor in phosphorus sorption on sediment.The normalized carbon sorption capacity of Ca-bound humus was l157.05mg/kg, which was 1.27 times of original sample, and adsorption mechanism was micro-hole function filling. The normalized carbon sorption capacity of Fe/Al-bound humus was 1736.82mg/kg, which was 1.88times of original sample, It plays an important role in phosphorus adsorption, and adsorption mechanism may be coordination adsorption apart from micro-hole function filling. Taking into account the adsorption capacity was not only organic matter content, but also existent state of organic matter, and it was also a main factor in sorption characteristic of phosphorus on sediment. When regarding original sample as a basic standard, adsorption capacity of phosphorus on Ca bound humus and Fe/A1 bound humus were estimated in accordance with 1.27and 1.88 times.

关 键 词：沉积物 有机矿质复合体 磷 碳标化吸附分配系数 碳标化饱和吸附量 

分 类 号：X131.2[环境科学与工程—环境科学]