Geochemical behaviour of dissolved trace elements in a monsoon-dominated tropical river basin, Southwestern India

摘要: The study presents a 3-year time series data on dissolved trace elements and rare earth (REEs) in monsoon-dominated river basin, the Nethravati River tropical Southwestern India. basin lies metamorphic transition boundary which separates Peninsular Gneiss Southern Granulitic province belonging to Archean Tertiary-Quaternary period (Western Dharwar Craton). lithology is mainly composed of granite gneiss, charnockite metasediment. This highlights importance for better estimation metal fluxes understand geochemical behaviour metals basin. show seasonality water concentrations forming two distinct groups metals. First group heavy minor that higher during dry season lesser monsoon season. Second lanthanides actinides with concentration lower Although both appears be controlled by discharge, there are important biogeochemical processes affecting their concentration. includes redox reactions (for Fe, Mn, As, Mo, Ba Ce) pH-mediated adsorption/desorption Ni, Co, Cr, Cu REEs). abundance Fe Mn oxyhydroxides as result could driving redistribution water. There Ce anomaly (Ce/Ce*) at different periods, negative positive, case phase, whereas positive particulate bed sediments. correlates variations oxygen indicating between phase under acidic neutral pH organic carbon. Unlike other major world rivers, effect complexation variability negligible