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Arsenic contamination, subsequent water toxicity, and associated public health risks in the lower Indus plain, Sindh province, Pakistan

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Abstract

Arsenic (As) contamination in drinking water is a global public health risk. The present study highlighted the geological and anthropogenic causes of As contamination in groundwater (GW) and surface water (SW) and assessment of their potential health risks in Sindh province of Pakistan. Upon analyzing 720 GW and SW samples from 18 different sites, the estimates of As in groundwater and surface water was observed in the range of 0 to 125 and 0 to 35 μg/L with mean values of 46.8 and 15.43 μg/L respectively. Majority of the samples exceeded WHO permissible limit of As (10 μg/L) with higher concentration detected in groundwater samples compared to surface water. Moreover, both of these sample sources were found not potable based on physicochemical characteristics. The results of statistical analysis (correlation analysis, principal component analysis (PCA), and hierarchy cluster analysis (HCA)) indicate that natural mobilization of As in groundwater is believed to be enhanced by the pH-based reductive dissolution of iron hydroxide (FeOH) and competitive sorption of bicarbonate minerals in the presence of microorganisms along with evaporative enrichment while water logging, coal mining, and excessive use of pesticides are believed to be the anthropogenic causes of As enrichment. Furthermore, enormous health risk was associated with As in terms of chronic daily intake (CRI), hazard quotient (HQ), and cancer risk probability (CR) in GW and SW. Mean HQ values in GW were 4.47 mg/kg/day in adults and 3.89 mg/kg/day in children (standard HQ ≤ 1) and was 1.43 and 1.28 mg/kg/day in SW. Mean CR value in both GW and SW was found higher than the safe limit (10−6) having a mean of 2 × 10−3 in GW and 7 × 10−4 (mg/kg/day) in SW. These findings suggest that majority of the sampling sites carry serious public health risk due to high As values and hence demands exigent remedial and management measures.

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Acknowledgements

The authors would like to thank the Pakistan Council of Research in Water Resources (PCRWR) for their support in sampling and analysis.

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  1. College of Environmental Science and Engineering, Guilin University of Technology, #12 Jiangan Road, Guilin City, Guangxi, 541004, People’s Republic of China

    Asfandyar Shahab

  2. School of Environmental Studies, Department of Environmental Science, China University of Geosciences, Wuhan, China

    Shihua Qi

  3. Department of Environmental Management & Policy, Balochistan University of IT, Engineering and Management Sciences, Quetta, Pakistan

    Muhammad Zaheer

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  1. Asfandyar Shahab
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Shahab, A., Qi, S. & Zaheer, M. Arsenic contamination, subsequent water toxicity, and associated public health risks in the lower Indus plain, Sindh province, Pakistan. Environ Sci Pollut Res 26, 30642–30662 (2019). https://doi.org/10.1007/s11356-018-2320-8

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