Multivariate analysis of trace elements in shallow groundwater in Fuchu in western Tokyo Metropolis, Japan
Multivariate analysis of trace elements in shallow groundwater in Fuchu in western Tokyo Metropolis, Japan
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DOI：
10.1007/s12665-015-5170-4
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发表时间：
2016-04-01
影响因子：
2.8
通讯作者：
Komatsu, Toshiko
中科院分区：
文献类型：
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作者：
Dang Quoc Thuyet;Saito, Hirotaka;Komatsu, Toshiko
用于建筑物供暖和制冷的地源热泵（GSHP）系统的使用迅速增加，可能会损害浅层地下水的质量。作为评价地源热泵对浅层地下水水质影响的必要前期工作，本研究采用多元统计分析方法对东京都西部府中市地下水微量元素特征进行了研究。在一年多的时间里，利用4口观测井从30米和45米深度的两个含水层每月采集两次水样。测定了14种微量元素（Li、B、Al、Cr、Mn、Fe、Ni、Cu、As、Se、Sr、Cd、Sb、Pb）和Si的浓度以及氧化还原电位（ORP）、溶解氧（DO）、电导率（EC）和pH。所有元素都符合日本环境省颁布的环境水质标准。地下水中15种元素的浓度没有明显的季节变化趋势。主成分分析表明，三主成分（PC）能很好地表征元素的性质。PC1由Li、B、Mn、Fe、As和Si组成，是地下水中流动性较大的微量元素。PC2包括Al、Ni、Cd和Sb，具有orp不敏感的特性。PC3主要由Pb、Cu和Se组成，在地下水中流动性较差。同一含水层样品中微量元素的分布和变化具有较高的相似性。本研究为评估地源热泵系统对浅层地下水水质的未来影响提供了一个有用的统计平台。
A rapid increase in the use of ground source heat pump (GSHP) systems for heating and cooling of buildings potentially threatens to harm shallow groundwater quality. As a necessary preliminary step toward evaluating GSHP impact on shallow groundwater quality, this study used multivariate statistical analyses to investigate characteristics of trace elements in groundwater in Fuchu city in western Tokyo Metropolis. Water samples were collected twice a month from two aquifers at 30-and 45-m depths using four observation wells for more than a year. Concentrations of 14 trace elements (Li, B, Al, Cr, Mn, Fe, Ni, Cu, As, Se, Sr, Cd, Sb, and Pb) and Si as well as oxidation-reduction potential (ORP), dissolved oxygen (DO), electrical conductivity (EC), and pH were measured. All elements were under the environmental water quality criteria issued by the Japanese Ministry of the Environment. No clear seasonal trends were observed in the concentrations of 15 elements in groundwater. Principal component analyses showed the element properties were well characterized by three principal components (PC). PC1, which represents the more mobile trace elements in the groundwater, consisted of Li, B, Mn, Fe, As, and Si. PC2 included Al, Ni, Cd, and Sb, and represents ORP-insensitive properties. PC3 consisted of Pb, Cu, and Se, which are less mobile in groundwater. Samples collected from the same aquifer had high similarity in distribution and variation of the trace elements. This study proposes a useful statistical platform for assessing future effects of GSHP systems on shallow groundwater quality.