题目 Title

Phosphorus adsorption by sediment considering mineral composition and environmental factors.

期刊 Journal

Environmental Science and Pollution Research(IF=4.223)

作者 Author

Li, XC; Huang, L; Fang, HW; Chen, MH; Cui, ZH; Sun, ZY; Reible, D

摘要 Abstract

Sediment, composed of a complex assemblage of minerals, controls the fate and behaviour of P in aqueous environments and affects trophic status. In this study, P adsorption was studied on minerals including quartz, hematite, potassium feldspar, montmorillonite, kaolin, and calcite (i.e., the main components of sediment) and sediment from the Guanting Reservoir. A general formula for P adsorption was proposed that considers mineral composition through the component additivity method, also incorporating the effects of environmental factors, including the aqueous P concentration (C-e), pH, sediment concentration (S), and ionic strength (IS). The P adsorption capacity gradually decreased with increasing particle size, and the contributions from kaolin and montmorillonite to P adsorption were significant despite representing only a small fraction of sediment (with a maximum amount of P adsorption of 0.92 and 0.36 mg/g, respectively). The content of quartz accounted for approximately 40-60% of sediment; however, its P adsorption capacity was only 0.13 mg/g. These minerals exhibited different adsorption characteristics due to their different surface morphologies and lattice structures. Multivariable regression analysis was used to show that the amount of P adsorption was strongly correlated with C-e, followed by S, IS, and pH.

简介 Brief introduction

泥沙颗粒具有复杂的电化学特征及表面形貌，也是多种矿物成分的复合体，相对于传统泥沙，该研究从矿物组成成分角度对泥沙颗粒与污染物磷相互作用的机理进行系统分析，并得到考虑外部环境因子(外因:离子强度,pH和含沙量等)和颗粒自身特性(内因:粒径和矿物成分等)等因素下，泥沙颗粒对磷的吸附统一计算公式。

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