Abstract
The purpose of this retrospective study was to assess the change that occurred in the quality of 34 groundwater resources within 10 years from 2011 to 2020 using multivariate statistical methods of ArcView GIS, water quality index (WQI), hierarchical cluster analyses (HCA), and hazard quotient (HQ) and also Monte Carlo simulation and sensitivity analyses to estimate the health risk raised by nitrate and fluoride. Our finding showed that the mean and standard deviation of measured parameters, including pH, electrical conductivity, total dissolved solid, color, calcium, magnesium, sodium, fluoride, chloride, nitrate, sulfate, bicarbonate, and total hardness, were 7.15 ± 0.13, 883 ± 320 (μS/cm), 378 ± 123 (mg/l), 3.86 ± 4.79 (TCU), 95 ± 21 (mg/l), 30 ± 8 (mg/l), 36 ± 13 (mg/l), 0.43 ± 0.14 (mg/l), 37.6 ± 19 (mg/l), 3.4 ± 1.5 (mg/l), 44 ± 10.3 (mg/l), 453 ± 124 (mg/l), and 360 ± 66 (mg/l). This result illustrates that the WQI ranged from 49.91 to 107.38, and the water quality was excellent, good, and weak in 11.7%, 74.6%, and 14.7% of samples, respectively. According to the WQI map, the unfavorable groundwater resource was located in areas with a high groundwater level and salty soil. The land use results showed that in areas with residential density, the concentration of nitrates was higher, as a result of which the risk index increased from 2011 to 2021. HQ analysis showed that fluoride and nitrate contents were below the risk limit (HQ < 1); however, HQ of fluoride was more than 1 infant group in 18.4% and 7.9% of samples in the wet season and warm season, respectively; consequently, care is needed to predict the changes in water quality.
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Data Availability
The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
This research was conducted with funding from the Vice Chancellery for Research and Technology at the Golestan University of Medical Sciences (Grant No: 112260). This study was approved by the Ethics Committee of Golestan University of Medical Sciences (Code No: IR.GOUMS.REC.1400.315). The authors wish to thank Seyyed Mohsen Alavi Nia, Habib Rahman Moghadam, and Moslem Sarani for their help and support in this research.
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Faraji, H., Shahryari, A. Estimation of Water Quality Index and Factors Affecting Their Changes in Groundwater Resource and Nitrate and Fluoride Risk Assessment. Water Air Soil Pollut 234, 608 (2023). https://doi.org/10.1007/s11270-023-06626-9
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DOI: https://doi.org/10.1007/s11270-023-06626-9