Abstract：
Water pollution is a worldwide concern that has growing severe in developed and developing nations. Increasing groundwater pollution threatening both the physical and environmental health of billions of people as well as economic progress. Consequently, hydrogeochemistry, water quality and potential health risk assessment is crucial for water resource management. The study area comprises Jamuna Floodplain (Holocene deposit) area in the west and the Madhupur tract (Pleistocene deposit) area in the eastern part. Total 39 groundwater samples were collected from the study area and were analyzed for physicochemical parameters, hydrogeochemical, trace metals, and isotopic composition. The water types are mainly Ca-HCO3- to Na-HCO3- types. The isotopic compositions (δ18O‰ and δ2H‰) analysis traces the recent recharge in Floodplain area from rainwater and no recent recharge in Madhupur tract. The concentration of NO3-, As, Cr, Ni, Pb, Fe, and Mn in shallow and intermediate aquifer at the Floodplain area exceed the WHO-2011 permissible limit and is lower at deep Holocene and Madhupur tract aquifer. The integrated weighted water quality index (IWQI) exposed groundwater from shallow and intermediate aquifer are unsuitable for drinking and deep Holocene aquifer and Madhupur tract are suitable for drinking purposes. PCA analysis confirmed that anthropogenic activity is dominant in shallow and intermediate aquifers. The non-carcinogenic and carcinogenic risk for adults and children is due to oral and dermal exposure. The non-carcinogenic risk evaluation revealed that the mean hazard index (HI) values range from 0.009742 to 16.37 for adults and 0.0124-20.83 for children, respectively, and most groundwater samples from shallow and intermediate aquifers exceed the permissible limit (HI>1). The carcinogenic risk ranges from 2.71 × 10-6-0.014 for adults and 3.44 × 10-6-0.017 for children via oral consumption and 7.09 × 10-11-1.18 × 10-6 for adults and 1.25 × 10-10-2.09 × 10-6 for children via dermal exposure. Spatial distribution shows the presence of trace metal and associated health risk is high in shallow and intermediate aquifer (Holocene) than in the deep (Holocene) Madhupur tract (Pleistocene). The study implies that effective water management will ensure safe drinking water for the future generation of people.
摘要：
水污染是一个世界性的问题，在发达国家和发展中国家都越来越严重。日益严重的地下水污染威胁着数十亿人的身体和环境健康以及经济进步。因此,水文地球化学,水质和潜在健康风险评估对于水资源管理至关重要。研究区包括西部的JamunaFloodplain（全新世矿床）区和东部的Madhupur束（更新世矿床）区。从研究区域共收集了39个地下水样品，并对其理化参数进行了分析。水文地球化学,微量金属,和同位素组成。水型主要为Ca-HCO3-至Na-HCO3-型。同位素组成（δ18O和δ2H）分析追溯了雨水在洪泛区的最新补给，而在Madhupur地区则没有最近的补给。NO3-的浓度，As,Cr,Ni,Pb,Fe,Floodplain地区浅层和中间含水层中的锰超过WHO-2011允许限值，而在全新世和Madhupur深区含水层中锰较低。来自浅层和中间含水层的综合加权水质指数（IWQI）暴露的地下水不适合饮用，而全新世深层含水层和Madhupur道适合饮用。PCA分析证实，人为活动在浅层和中间含水层中占主导地位。成人和儿童的非致癌和致癌风险是由于口腔和皮肤暴露。非致癌风险评估显示，成人的平均危害指数（HI）值范围为0.009742至16.37，儿童为0.0124-20.83，分别,来自浅层和中间含水层的大多数地下水样品超过允许限值(HI>1)。通过口服食用，成人的致癌风险为2.71×10-6-0.014，儿童的致癌风险为3.44×10-6-0.017，成人为7.09×10-11-1.18×10-6，儿童为1.25×10-10-2.09×10-6。空间分布表明，浅层和中间含水层（全新世）的痕量金属和相关健康风险高于深层（全新世）Madhupur道（更新世）。该研究表明，有效的水管理将确保下一代人的安全饮用水。
