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Groundwater fluoride concentrations in the watershed sedimentary basin of Quetta Valley, Pakistan

Abstract

Litho-geochemical characteristics of low and high fluoride (F–) groundwater along with hydrological processes were investigated to delineate its genesis and enrichment mechanism in a watershed sedimentary basin. In this study, groundwater F– concentration ranged from 0 to 20 mg/L with a mean and standard deviation of 2.8 and ± 3.7 mg/L, respectively. Out of N = 87, 63% of samples exceeded the World Health Organization (WHO) limit of 1.5 mg/L. The order of cationic and anionic dominance in groundwater samples with mean was found in decreasing order as Na+ > Mg2+ > Ca2+ > K+ and HCO3– > SO42- > Cl– > PO43-  > NO3– measured in milligrams per liter. Groundwater chemistry changed from Ca-HCO3 to Na-HCO3 type and low to high fluoride as we moved from mountain foot towards the synclinal basin. Low fluoride groundwater reflected weathering, recharge, and reverse ion exchange processes with Ca–HCO3– and Ca–Mg–Cl–type water while high fluoride groundwater revealed base ion exchange, mixing, and desorption as dominant hydrological processes with Na-HCO3 and Na-Cl types of water. Gibb’s diagram showed rock weathering and mineral dissolution as the major geochemical processes controlling water chemistry with an insignificant role of evaporation in the semi-arid area. Fluoride was undersaturated with mineral fluorite, indicating fluoride in groundwater is released by secondary minerals. However, due to complex geological features, groundwater fluoride enrichment was affected by a broad-scale process across a wide area such as depth, residence time, and most important geomorphological units hosting the aquifer.

*Original abstract online at https://link.springer.com/article/10.1007%2Fs10661-021-09365-8

Data availability

Data analyzed during this study can be found in this manuscript and supplementary information file.

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Acknowledgements

The study was financially supported by the Department of Environmental Science, Quaid-i-Azam University, Islamabad. Sir Mazhar and Sir Abdullah of Public Health and Engineering Department (PHED) Quetta shared valuable data of the well logs, while Dr. Yaqoob of the National Center of Physics (NCP) helped in soil analysis; without their support and assistance, the study would have been impossible to be conducted.

Author information

Affiliations

Taimoor Shah Durrani & Abida Farooqi: Hydro-Geochemistry Laboratory, Department of Environmental Sciences, Faculty of Biological Sciences, Quaid-I-Azam University, Islamabad, Pakistan

Taimoor Shah Durrani: Balochistan University of Information Technology Engineering and Management Sciences, Quetta, Pakistan

Corresponding authors

Correspondence to Taimoor Shah Durrani or Abida Farooqi.

*Original abstract online at https://link.springer.com/article/10.1007%2Fs10661-021-09365-8

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