桑沟湾表层沉积物性质及对磷的吸附特征  

Surface Property and Sorption Characteristics of Phosphorus onto Surface Sediments in Sanggou Bay

作　　者：朱佳美 曹晓燕[1,2] 刘素美[2] 王丽莎[1] 杨桂朋[1,2] 葛成凤[1] 路敏[1] 

机构地区：[1]中国海洋大学化学化工学院,青岛266100 [2]中国海洋大学海洋化学理论与工程技术教育部重点实验室,青岛266100

出　　处：《环境科学》2016年第2期558-564,共7页Environmental Science

基　　金：国家重点基础研究发展规划(973)项目(2011CB409802);山东省自然科学基金项目(ZR2013DM018);海洋化学理论与工程技术教育部重点实验室(中国海洋大学)访问学者基金项目;山东省'泰山学者'建设工程专项

摘　　要：通过研究桑沟湾表层沉积物对磷的吸附动力学曲线和吸附等温线,并结合沉积物的表面电荷性质及磷的形态分析,考察了沉积物对磷的吸附性能和吸附机制.结果表明,桑沟湾表层沉积物对磷的吸附过程包括快吸附过程和慢吸附过程,可用快慢二段一级动力学方程描述,等温线符合Langmuir交叉式模型.夏季沉积物样品的最大吸附量高于春季样品,粒级较小的沉积物吸附能力较强.沉积物样品对磷的最大吸附量Qm在0.047 1~0.123 0 mg·g-1之间,吸附/解吸平衡磷浓度（EPC0）范围在0.059 6~0.192 7 mg·L-1,沉积物充当＂磷源＂的作用.不同站位表层沉积物中无机磷（IP）是磷在沉积物中的主要赋存形态,吸附后的沉积物样品中弱吸附态磷（Ex-P）、铁结合态磷（Fe-P）明显增加.吸附过程包括物理吸附和化学吸附,以物理吸附为主.Kinetic curves and isotherms were investigated to study the sorption mechanism of phosphorus onto the sediments of Sanggou Bay,together with the surface charge properties of sediments and the forms of phosphorus studied. The results showed that the sorption including a fast process and a slow one,and could be described by a two-compartment first order equation. The thermodynamic isotherms were well fitted with a modified Langmuir equation. The maximum adsorption capacity was larger in summer than in spring,and the smaller particle size was favorable to the sorption. The maximum adsorption capacities（ Qm） were 0. 047 1-0. 123 0 mg·g- 1,and the zero equilibrium phosphorus concentration（ EPC0） of the sediments ranged from 0. 059 6 mg·L- 1to 0. 192 7 mg·L- 1,which indicated that the sediments from Sanggou Bay were sources of phosphorus. Inorganic phosphorus（ IP） was the main form of total phosphorus（ TP）. The contents of exchangeable or loosely absorbed P and Fe-bound P increased significantly in the samples after sorption. The sorption process involved physical sorption and chemical sorption,with the former being the predominant.

关 键 词：沉积物 磷 吸附 表面电荷 赋存形态 桑沟湾 

分 类 号：X131.2[环境科学与工程—环境科学] X55