桑沟湾表层沉积物性质及对磷的吸附特征

发布时间：2018-01-11 03:09

本文关键词：桑沟湾表层沉积物性质及对磷的吸附特征　出处：《环境科学》2016年02期 　论文类型：期刊论文

【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.
[Abstract]:The adsorption kinetics curve and adsorption isotherm of phosphorus in the surface sediment of Sangou Bay were studied, and the surface charge properties and phosphorus speciation of the sediment were analyzed. The adsorption behavior and mechanism of phosphorus in sediment were investigated. The results showed that the adsorption process of phosphorus on surface sediment of Sangou Bay included fast adsorption process and slow adsorption process, which could be described by the first-order kinetic equation of the second stage. The isotherm accords with Langmuir cross model. The maximum adsorption capacity of sediment samples in summer is higher than that in spring. The maximum adsorption capacity of phosphorus in sediment samples was between 0.047 1 ~ 0.123 mg 路g ~ (-1) and 0.123 0 mg 路g ~ (-1). The adsorption / desorption equilibrium phosphorus concentration (EPC0) was in the range of 0.059 6 ~ 0.192 7 mg 路L ~ (-1). The inorganic phosphorus IPs in the surface sediments of different stations are the main forms of phosphorus in the sediments, and the weakly adsorbed phosphorus (Ex-P) in the adsorbed sediment samples. The adsorption process includes physical adsorption and chemical adsorption, mainly physical adsorption.
【作者单位】：中国海洋大学化学化工学院;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;
【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
【分类号】：X55
【正文快照】： 青岛266100)磷是影响藻类生长、水体富营养化的重要营养元素之一,而沉积物是海洋中氮、磷等营养盐蓄积、释放的重要场所[1,2].桑沟湾位于山东半岛东端,北、西、南为陆地环绕,湾口向东,为半封闭海湾,平均水深约7.5 m,是我国北方重要的水产品基地,主要养殖品种有贝类和海带等,其

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