Geochemical fractions and modeling adsorption of heavy metals into contaminated river sediments in Japan and Thailand determined by sequential leaching technique using ICP-MS
Geochemical fractions and modeling adsorption of heavy metals into contaminated river sediments in Japan and Thailand determined by sequential leaching technique using ICP-MS
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DOI：
10.1016/j.arabjc.2016.10.015
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发表时间：
2016-11
影响因子：
6
通讯作者：
A. Wijaya;S. Ohde;R. Shinjo;M. Ganmanee;Michael Dustin Cohen
中科院分区：
文献类型：
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作者：
A. Wijaya;S. Ohde;R. Shinjo;M. Ganmanee;Michael Dustin Cohen
为了提供有关沉积物组分中的化学过程及其吸附模型的信息，我们调查了日本东京的住田河和泰国曼谷的湄南河的污染沉积物。样品通过顺序淋洗技术进行金属浓度分析，以评估沉积物分数，然后使用等温线、Langmuir和Freundlich方程测试样品对受重金属污染的最高水平沉积物的模型吸附。采用电感耦合等离子体质谱(ICPMS)分析浸出液中重金属(铅、镉、锌、砷、铜、钙、铁、锰)的含量。结果表明，两个沉积物样品中Cd(38.6%)、Ca(55.2%)、Mn(41.3%)、可还原部分(52.1%)、Zn(56.7%)、可氧化部分(61.2%)、As(47.1%)、Fe(55.9%)的淋溶量最大。与苏美达河相比，湄南河沉积物中铅(62.6ppm)、锌(240ppm)、砷(27.2ppm)、铁(16636ppm)和锰(419ppm)的总含量较高，表明曼谷具有较高的人为影响。在污染最严重的沉积物中，由X射线衍射和有机质含量确定的SiO_2、CaCO_3和Al_2O_3对重金属的吸附能力较高。Cd的吸附模型符合朗缪尔方程的线性形式，相关系数分别为0.467和7137，而铅、铜、铬和锌的吸附符合Freundlich方程。
In order to provide information on the chemical processes in sediment fractions and their adsorption models, we investigated the contaminated sediments of the Sumida River in Tokyo, Japan and the Chao Phraya River in Bangkok, Thailand. Samples were leached through a sequential leaching technique to perform metal concentration analysis for the sediment fraction assessment and then samples were tested for the model adsorption of the highest level of sediments contaminated by heavy metals using the isotherm Langmuir and Freundlich equations. Metal (Pb, Cd, Zn, As, Cu, Ca, Fe, and Mn) concentration in the leached solutions was analyzed by Inductively Coupled Plasma-Mass Spectrometry (ICP-MS). The pattern of geochemical fractions in both sediment samples showed the maxima leached levels of Cd (38.6 %), Ca (55.2%), and Mn (41.3%) in the soluble fraction; Pb (52.1%), and Zn (56.7%) in the reducible fraction; Cu (61.2%) in the oxidizable fraction; and As (47.1%) and Fe (55.9%) in the residual fraction. The total level fractions of Pb (62.6 ppm), Zn (240 ppm), As (27.2 ppm), Fe (16,636 ppm) and Mn (419 ppm) in the Chao Phraya River sediments were higher compared to those in the Sumida River, indicating the high anthropogenic effect in Bangkok. In the most contaminated sediments, the higher adsorption capacity of heavy metal concentrations was contributed by SiO2,CaCO3,and Al2O3determined by the X-ray diffraction and organic contents. The model of adsorption of Cd fitted to the linear form of Langmuir’s equation with the correlation coefficients (r2= 0.94), b (0.467) and k (7137), whereas Pb, Cu, Cr, and Zn conformed to the model of the Freundlich equation.