Agriculture is a major activity in most rural areas in northern Thailand. The aim of this study was to assess the heavy metal pollution index (HPI) for water supply quality in a rural village in Kalasin Province named Kaeng Ka-am village located in the hillside area of Phu Phan mountain. The concentration of heavy metals including iron (Fe), manganese (Mn), and zinc (Zn) in groundwater supply has been analyzed by the atomic absorption spectrometer. The groundwater supplied samples were collected from eight different locations in and around the region which covers agricultural and municipal area during the monsoon and post-monsoon seasons. The results were evaluated in accordance with the drinking water quality standards suggested by the World Health Organization and Thailand Department of Health Standards. Most of the samples were found within limit except for Fe and Mn contents during the monsoon season at three sampling locations which is above the desirable limit, i.e., 0.3 mg/L. The mean values of HPI were 70 and 46 in the monsoon and the post-monsoon season, respectively, and these values are well below the critical index limit of 100.

中文翻译：

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重金属污染指数，用于评估泰国加拉信山区的季节性地下水供应质量

农业是泰国北部大多数农村地区的一项主要活动。这项研究的目的是评估位于富潘山山坡上的Kalasin省一个名为Kaeng Ka-am村的农村村庄的供水质量的重金属污染指数（HPI）。用原子吸收光谱仪分析了地下水中铁（Fe），锰（Mn）和锌（Zn）等重金属的浓度。在季风季节和季风之后的季节，从该地区及其周围的八个不同地点收集了地下水供应的样品，这些地区覆盖了农业和市政领域。根据世界卫生组织和泰国卫生部建议的饮用水水质标准对结果进行了评估。在季风季节的三个采样地点，除了Fe和Mn的含量超过了理想的限值（即0.3 mg / L）外，大多数样品都在限值范围内。在季风季节和季风后季节，HPI的平均值分别为70和46，这些值远远低于临界指数限制100。