Isotopes and geochemical tools for investigating the source of metal pollution in Uchhali Lake

Abstract Uchalli Lake (Ramsar site), with a surface area of 14.3 km2, is the largest lake Uchhali Wetlands Complex. Heavy inorganic pollution (metals and nutrients) load in had been reported by other researchers, but sources its effects on surrounding groundwater have never investigated. In present study, stable isotopes δ18O δ2H were applied to find out recharge groundwater. Additionally, δ15N (NO3) used system. The geochemical data suggested that was mainly recharged local meteoric water. higher evaporation water coupled alkaline nature sediments led enrichment pollutants sediments. Nitrate both geogenic anthropogenic are comprised rock/minerals weathering soil erosion, whereas agricultural activities catchment areas. δ18O, δ2H, D-excess values rainwater, limited contribution from