Nepal Academy of Science and Technology, GPO Box 3323, Kathmandu, Nepal.
Environ Monit Assess. 2011 Jul;178(1-4):477-85. doi: 10.1007/s10661-010-1706-y. Epub 2010 Sep 21.
A study was undertaken to assess the quality of groundwaters in the Kathmandu Valley, Nepal. The groundwater samples were randomly collected from shallow well, tube well, and deep-tube wells located at different places of Kathmandu, Lalitpur, and Bhaktapur districts in the Kathmandu valley. Physical, chemical, and microbiological parameters of the samples were evaluated to estimate the groundwater quality for drinking water. It was found that the groundwater in the valley is vulnerable to drink due to presence of iron and coliform bacteria. Iron was estimated to be much higher then the acceptable limit of World Health Organization (WHO) drinking-water quality guidelines (1.9 mg/L). Total coliform bacteria enumerated in groundwaters significantly exceeded the drinking-water quality standard and observed maximum coliform (267 CFU/100 mL) in shallow wells. The electrical conductivity and turbidity were found to be 875 μS/cm and 55 NTU, respectively, which are above the WHO recommendations for drinking water guidelines. However, pH value was measured within the acceptable limit. Arsenic, chloride, fluoride, and hardness concentrations were found to be in agreement with the recommendations of WHO drinking-water quality guidelines.
一项研究旨在评估尼泊尔加德满都谷地地下水的质量。地下水样本是从加德满都、拉利特布尔和巴克塔普尔地区不同地方的浅井、管井和深井中随机采集的。评估了样本的物理、化学和微生物参数，以评估地下水的饮用水质量。结果发现，由于铁和大肠菌群的存在，该谷地的地下水不宜饮用。铁的含量估计远远超过世界卫生组织（WHO）饮用水质量指南（1.9 毫克/升）的可接受限值。地下水中总大肠菌群的数量明显超过饮用水质量标准，在浅井中观察到最大的大肠菌群（267 CFU/100 毫升）。电导率和浊度分别为 875 μS/cm 和 55 NTU，均高于世界卫生组织饮用水指南的建议值。然而，pH 值在可接受的范围内。砷、氯、氟和硬度浓度均符合世界卫生组织饮用水质量指南的建议。
