Geochemical modeling to evaluate the mangrove forest water
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The knowledge about genetic origin of the chemical elements is important for the evaluation of hydro-geochemistry of aquatic ecosystem. In the present study, pre- and post-monsoon samples were collected to identify the role of rain and seawater in the hydro-geochemical processes. Geochemical model and multivariate statistical methods of data analysis were jointly used to define the variations and the genetic origin of chemical parameters of water in mangrove ecosystem. The geochemical model, WATEQ4F, was executed to compute the saturation indices of the minerals with respect to surface water. The interpretation of the saturation indices for minerals shows that the majority of samples fall in the category of under saturation state except for fluorite. An increase in the concentration of various nutrients, namely, nitrate and phosphate, was observed. Suitability of water was checked on the basis of chemical categorisation by Aquachem software. Grouping of waters on the Piper diagram suggested a common composition and origins. Further results showed that pre- and post-monsoon samples mainly consist of Na–Cl and Ca–Cl water type indicating a significant contribution of cations and anions from terrestrial and marine inputs in the mangrove ecosystem.