Heavy metal pollution in groundwater is a substantial environmental risk for Bangladesh. The Meghna Ghat industrial area in Bangladesh becomes a promising site for installing various industries for few decades. It was necessary to assess the heavy metal level in the groundwater of this area, and current study took the initiative. We collected 20 groundwater samples and tested pH, DO, TDS, EC, turbidity, COD, and DOC as well as four heavy metals (Cr, Cd, Pb, and Ni) to calculate four water quality indices, i.e., water quality index (WQI), degree of contamination (DC), heavy metal evaluation index (HEI), and heavy metal pollution index (HPI). Ni was too low to detect by the instrument, whereas the mean concentrations of Cr, Cd, and Pb were 0.07, 0.007, and 0.18 mg/L which exceeded the drinking water standards set by Bangladesh. According to the water quality indices, only 10% samples were good according to WQI; 30% and 15% samples were subjected to low level of pollution considering DC and HEI, respectively. Although according to HPI 35% samples were unsuitable for drinking, rest of the values were very close to characterize as unsuitable. Finally, we proposed two best-fitted models that can represent relationships between the metals and water quality indices. Water quality was comparatively better near the open spaces of the study area. The area needed to be under continuous monitoring for checking further pollution distribution.

中文翻译：

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孟加拉国Meghna Ghat工业区地下水的重金属污染评估，采用水污染指数法

地下水中的重金属污染是孟加拉国的重大环境风险。孟加拉国的Meghna Ghat工业区成为数十年来安装各种工业的有希望的场所。有必要评估该地区地下水中的重金属含量，并且目前的研究是主动的。我们收集了20个地下水样品，并测试了pH，DO，TDS，EC，浊度，COD和DOC以及四种重金属（Cr，Cd，Pb和Ni），以计算出四种水质指数，即水质指数（ WQI），污染程度（DC），重金属评估指数（HEI）和重金属污染指数（HPI）。Ni含量太低而无法用仪器检测到，而Cr，Cd和Pb的平均浓度分别为0.07、0.007和0.18 mg / L，超过了孟加拉国制定的饮用水标准。根据水质指标，根据WQI，只有10％的样品合格；考虑到DC和HEI，分别有30％和15％的样品受到了低水平的污染。尽管根据HPI，有35％的样品不适合饮用，但其余的值非常接近于不适合饮用。最后，我们提出了两个最适合的模型，它们可以代表金属和水质指数之间的关系。研究区域的开放空间附近的水质相对较好。需要对该区域进行持续监控，以检查进一步的污染分布。其余的值非常接近，被描述为不合适。最后，我们提出了两个最适合的模型，它们可以代表金属和水质指数之间的关系。研究区域的开放空间附近的水质相对较好。需要对该区域进行持续监控，以检查进一步的污染分布。其余的值非常接近，被描述为不合适。最后，我们提出了两个最适合的模型，它们可以代表金属和水质指数之间的关系。研究区域的开放空间附近的水质相对较好。需要对该区域进行持续监控，以检查进一步的污染分布。