... geochemicalconditions (an oxidizing environment with neutral pH) that suggest significant immobilization by73 -7 5 -7 0 -6 5 -6 0 -5 5 -5 0 -1 1 -7 δ2Η ‰δ18Ο ‰ -1 0 -9 -8 y = 7.97x + 11.03Figure 5. ... hydrological system, (2) to investigate the source(s) of67 Natural Arsenic in Groundwater: Occurrence, Remediation and Management – Bundschuh, Bhattacharya and Chandrasekharam (eds)© 2005, ... geochemistry is domin-ated by Ca, Mg, and HCO3, as expected for waters interacting with carbonate rocks and/ or cal-cium-rich soils.High concentrations of Cl, K, Na, NO3-N, and SO4, and high electrical...