Hydrochemistry of sediment pore water in the Bratsk reservoir (Baikal region, Russia)

Abstract This study aimed to identify the factors responsible for major ion composition of pore water from bottom sediments Bratsk reservoir, which is part largest freshwater Baikal-Angara system. In overlying was characterized as HCO 3 –Ca–Mg type with mineralization ranging between 101.2 and 127.7 mg L ?1 –SO 4 –Ca, SO –Cl–Ca–Mg mixed types, had varying 165.9 4608.1 . The ionic waters varied both along sediment depth profile across area. water, difference highest lowest values remarkably large: 5.1 times K + , 13 Mg 2+ 16 ? 20 Ca 23 Na 80 2? 105 Cl Such variability at different sites reservoir due interrelation concentrations in environmental parameters. factor chemistry dissolution sediment-forming material coming various geochemical provinces. south may significantly increase effect subaqueous flow highly mineralized groundwater.