Abstract
The occurrence of uranium in groundwater can cause potential human health risks and public health safety concerns in any region of the world. The present study is an attempt to assess the presence of uranium in groundwater resources of Manipur valley in India covering 2,238 sq.km. and its probable chemical and radiological toxicity risk associated with human health. The analysis of samples for both premonsoon (PM) and postmonsoon (PoM) seasons shows that all 140 values lie well below the provisional guideline of 30 ppb as per the World Health Organization. The maximum concentrations of uranium were recorded as 10.93 and 10.89 ppb during PM and PoM, respectively. The average concentrations were found to be 0.44 ppb during PM and 0.71 ppb during PoM. Comparing the results from a radiological risk perspective described by the Atomic Energy Regulatory Board, India, the permissible maximum risk is 1.67×10-4. For the study, the cancer mortality risks were found to be 1.05×10-6 and 6.38×10-7, respectively, for PM and PoM. Similarly, the cancer morbidity risks are 1.60×10-6 and 9.76×10-7 for PM and PoM samples, respectively. Thus, it indicates that the likelihood of carcinogenic risks is insignificant for using groundwater samples for potable uses. Moreover, the groundwater samples show a hazard quotient lower than 1.0, signifying a very low risk from uranium's chemical toxicity. The calculated lifetime average daily dose ranged from 0 to 0.31μg/[kg.day] for PM and PoM groundwater samples. Thus, the present study highlights the spatial and temporal variability of uranium concentration in groundwater of the study area and probable human health risk associated with the continuous consumption of uranium-containing groundwater.
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