IJEP 41(8): 953-960 : Vol. 41 Issue. 8 (August 2021)
Vels University, Department of Petroleum Engineering, Pallavaram – 600 117, Tamil Nadu, India
Abstract
The intent of the present study is to comprehend the geochemical processes of fluorides in groundwater from Tiruppur taluk of Tiruppur district, Tamil Nadu, India. Geologically, the region has base rocks of Archaean group of charnockite, hornblende biotite gneiss, pink granite, anorthosite and amphibolites. Outstanding fluorides (F–) in groundwater were observed in semi-arid of hard rock areas. This study result posits the groundwater is characterized by sodium (Na+): bicarbonate (HCO3–) facies. The fluorides of study environ vary from 0.12-2.34 mg/L with an average of 1.2 mg/L. Since the total samples collected 30% of fluoride indicates fluoride concentration surpasses the maximum allowable limit of 1.5 mg/L. This study suggests spatial variation noticed in fluoride substance emerge due to fluoride bearing minerals, grade of weathering of rocks, contact interval of aquifer material with water and the related geochemical process. A correlation attempted has been made between the fluoride concentrations with water type, the relationship of fluoride with HCO3–, fluoride with Na+ and pH (parts of hydrogen) were studied and proves that HCO3– has a better correlation with fluoride than the other parameters. The weathering of rocks causes the release of Na+ and HCO3– ions, which controls the water chemistry by strong acid by intensive ion exchange. Hence this correlation reveals Na+, Cl– (chloride) and Mg2+ (magnesium) ions play a vital role in controlling water chemistry of this area.
Keywords
Fluorides, Hard rock, Spatial distribution, Correlation, Tiruppur taluk, Tamil Nadu
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