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首页> 外文期刊>Geochemistry: Interdisciplinary Journal for Chemical Problems of the Geosciences and Geoecology >Principal component analysis and hierarchical cluster analyses of arsenic groundwater geochemistry in the Hetao basin, Inner Mongolia
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Principal component analysis and hierarchical cluster analyses of arsenic groundwater geochemistry in the Hetao basin, Inner Mongolia

机译：内蒙古河套盆地砷地下水地球化学的主成分分析和层次聚类分析

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摘要

Although high As groundwater has been observed in shallow groundwater of the Hetao basin, little is known about As distribution in deep groundwater. Quantitative investigations into relationships among chemical properties and among samples in different areas were carried out. Ninety groundwater samples were collected from deep aquifers of the northwest of the basin. Twenty-two physicochemical parameters were obtained for each sample. Statistical methods, including principal component analysis (PCA) and hierarchical cluster analysis (HCA), were used to analyze those data. Results show that As species were highly correlated with Fe species, NH4-N and pH. Furthermore, result of PCA indicates that high As groundwater was controlled by geological, reducing and oxic factors. The samples are classified into three clusters in HCA, which corresponded to the alluvial fans, the distal zone and the flat plain. Moreover, the combination of PCA with HCA shows the different dominant factors in different areas. In the alluvial fans, groundwater is influenced by oxic factors, and low As concentrations are observed. In the distal zone, groundwater is under suboxic conditions, which is dominated by reducing and geological factors. In the flat plain, groundwater is characterized by reducing conditions and high As concentrations, which is dominated by the reducing factor. This investigations indicate that deep groundwater in the alluvial fans mostly contains low As concentrations but high NO3 and U concentrations, and needs to be carefully checked prior to being used for drinking water sources. (C) 2015 Elsevier GmbH. All rights reserved.
机译：尽管在河套盆地浅层地下水中已观测到高砷地下水，但对于深层地下水中砷的分布知之甚少。对不同区域的化学性质之间和样品之间的关系进行了定量研究。从该盆地西北部的深层含水层收集了90个地下水样品。每个样品获得二十二个理化参数。统计方法包括主成分分析（PCA）和层次聚类分析（HCA），用于分析这些数据。结果表明，As物种与Fe物种，NH4-N和pH高度相关。此外，PCA的结果表明高砷地下水受地质，还原和有氧因素控制。样本在HCA中分为三个簇，分别对应于冲积扇，远侧区和平原。而且，PCA和HCA的结合在不同地区显示出不同的主导因素。在冲积扇中，地下水受有氧因素影响，并且观察到较低的As浓度。在远端区域，地下水处于低氧条件下，主要受还原和地质因素的影响。在平坦的平原上，地下水的特征在于还原条件和高砷浓度，这主要由还原因子决定。这项研究表明，冲积扇中的深层地下水主要含有低浓度的砷，而高的NO3和U浓度，因此在用于饮用水源之前需要仔细检查。 （C）2015 Elsevier GmbH。版权所有。

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