A comparative study on hydrochemical evolution and quality of groundwater in coastal areas of Thailand and Bangladesh

In recent years, Thailand and Bangladesh have been drawing more attention due to groundwater pollution, but there is rarely a comparative study on hydrochemical evolution and quality assessment of groundwater in the areas In this paper, end-member mixing and Gibbs model are used to study the evolution of groundwater hydrochemistry based on the 74 water samples. Due to the seawater intrusion, the evolution path of groundwater in Bangkok Bay is Ca/Mg-HCO3 → Na (Ca/Mg)-HCO3 and Na (Ca/Mg)-Cl → Na-Cl, which led to increased Na+, K+, and HCO3– concentrations in groundwater and enrichment of fluorine in groundwater caused fluorine pollution. In contrast, although the evolution path of groundwater in southern Bangladesh shows a similar pattern as Ca/Mg-HCO3 → Na (Ca/Mg)-HCO3 and…