孟加拉国勐拉市及周边地区饮用水水质评价及其对健康的影响

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摘要

孟加拉国南部的蒙拉市正面临着缺乏合适饮用水的问题。本研究旨在确定地下水的地球化学性质是否适合饮用。收集了24口管井、Tab水和其他饮用水源的水样。主要目的是评价蒙拉市及周边地区地下水砷盐危害。研究区饮用水的pH值在6.7至7.38之间,平均值为7.09,在饮用水允许范围内。TDS值为95.96 ~ 1365.60 mg/l。欧共体和TDS值均符合饮用水水质标准。据世卫组织称,砷污染范围在0ppb至335 ppb之间,在孟加拉国砷标准(<50ppb)的允许范围内。除Na+浓度略高,平均值为203.36 mg/l外,阳离子和阴离子均在饮用允许范围内。拉姆帕尔地区的人们在离他们家50米远的地方就能得到安全的饮用水,有些人离他们家很近。勐拉市非常靠近过山车,因此很少有深管被发现,高盐度入侵不适合饮用,大多数时候,他们不得不从非政府组织或政府控制的公司购买安全饮用水。很少有人使用自来水和池塘水作为饮用目的。研究区地下水盐度危害为轻度至中度,适宜饮用,砷含量在可接受范围内。因此,可以得出结论,蒙拉市及周边地区的地下水是有益健康的。
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Assessment of Drinking Water Quality and its Effects on Health from Mongla City with Surrounding Area of Bangladesh
Mongla City in the southern part of Bangladesh is facing problems with the scarcity of suitable drinking water. The present study is to identify the suitability of the geochemical property of groundwater for drinking purposes. The water samples from 24 Tub-wells, Tab water, and other drinking water sources have been collected. The main purpose is to assess the groundwater arsenic and salinity hazard in Mongla City and its surrounding area. The pH value of drinking water in the study area ranges from 6.7 to 7.38 with an average value of 7.09, which is within the permissible limit for drinking uses. The TDS values range from 95.96-to 1365.60 mg/l. The EC and TDS values fall within the drinking water quality standard. According to WHO, the Arsenic contamination ranges between 0 ppb – 335 ppb which is within the permissible range of the Bangladesh Arsenic Standard (<50ppb). All the Cations and Anions are within the permissible limit of the drinking uses except the Na+ concentration is slightly higher with an average value being 203.36 mg/l. The people in the Rampal area get safe drinking water within 50m far away from their house and some are very near to their houses. Mongla city is located very near to the coaster hence few deep tubes are well found and high salinity intrusion is unsuitable for drinking purposes, Most of the time, they had to buy safe drinking water from NGOs or GO controlled companies. Very few people use Tap water and pond water for drinking purposes. The Groundwater of the study area is slight to moderate and suitable for drinking purposes in terms of salinity hazards and arsenic concentration is within the acceptable range. Hence, it can be concluded that groundwater o Mongla city and the surrounding area are good for health.
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