Co-transport of Pb (II) and Cd (II) in saturated porous media: effects of colloids, flow rate and grain size

Q3 Chemical Engineering Chemical Speciation and Bioavailability Pub Date : 2018-01-01 DOI:10.1080/09542299.2018.1531727

Bi‐Qin Xie, Yanji Jiang, Zhe Zhang, Gang Cao, Huimin Sun, Nong Wang, Shengsen Wang

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引用次数: 19

Abstract

ABSTRACT The transport of Pb(II) or Cd(II) in subsurface has been studied in the literature; however; their co-transport in porous media in presence of colloids has not been clearly understood. In this work, a series of column experiments were conducted to study Pb(II) and Cd(II) co-transport in saturated porous media under various experimental conditions with different combination of colloidal solution (montmorillonite colloid, manual loessial soil colloid and humic acid), flow rate (0.1, 0.5 and 1.0 ml min−1) and sand grain size (0.4–0.8mm and 0.8–2.0mm). The results showed that increase of flow rate and grain size promoted the mobility of Pb(II) and Cd(II), furthermore, the presences of mobile colloids also enhanced the mobility of the two heavy metals, meanwhile, Cd(II) showed higher mobility than Pb(II) in the columns. Findings from this work enhanced current understanding of the competitive transport and colloid-facilitated transport of heavy metals in saturated porous media.

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Pb (II)和Cd (II)在饱和多孔介质中的共输运:胶体、流速和晶粒尺寸的影响

文献研究了Pb(II)或Cd(II)在地下的输运;然而;它们在有胶体存在的多孔介质中的共输运尚不清楚。在不同的实验条件下，采用不同的胶体溶液(蒙脱土胶体、人工黄土胶体和腐殖酸)组合、流速(0.1、0.5和1.0 ml min - 1)和砂粒尺寸(0.4-0.8mm和0.8-2.0mm)，研究了Pb(II)和Cd(II)在饱和多孔介质中的共输移。结果表明，流速和粒径的增加促进了Pb(II)和Cd(II)的迁移率，流动胶体的存在也增强了这两种重金属的迁移率，同时Cd(II)在柱中的迁移率高于Pb(II)。这项工作的发现增强了目前对饱和多孔介质中重金属的竞争性运输和胶体促进运输的理解。

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来源期刊

Chemical Speciation and Bioavailability 环境科学-毒理学

CiteScore

1.62

自引率

0.00%

发文量

审稿时长

1 months

期刊介绍： Chemical Speciation & Bioavailability ( CS&B) is a scholarly, peer-reviewed forum for insights on the chemical aspects of occurrence, distribution, transport, transformation, transfer, fate, and effects of substances in the environment and biota, and their impacts on the uptake of the substances by living organisms. Substances of interests include both beneficial and toxic ones, especially nutrients, heavy metals, persistent organic pollutants, and emerging contaminants, such as engineered nanomaterials, as well as pharmaceuticals and personal-care products as pollutants. It is the aim of this Journal to develop an international community of experienced colleagues to promote the research, discussion, review, and spread of information on chemical speciation and bioavailability, which is a topic of interest to researchers in many disciplines, including environmental, chemical, biological, food, medical, toxicology, and health sciences. Key themes in the scope of the Journal include, but are not limited to, the following “6Ms”: Methods for speciation analysis and the evaluation of bioavailability, especially the development, validation, and application of novel methods and techniques. Media that sustain the processes of release, distribution, transformation, and transfer of chemical speciation; of particular interest are emerging contaminants, such as engineered nanomaterials, pharmaceuticals, and personal-care products. Mobility of substance species in environment and biota, either spatially or temporally. Matters that influence the chemical speciation and bioavailability, mainly environmentally relevant conditions. Mechanisms that govern the transport, transformation, transfer, and fate of chemical speciation in the environment, and the biouptake of substances. Models for the simulation of chemical speciation and bioavailability, and for the prediction of toxicity. Chemical Speciation & Bioavailability is a fully open access journal. This means all submitted articles will, if accepted, be available for anyone to read, anywhere, at any time. immediately on publication. There are no charges for submission to this journal.