Hydrogeochemistry of groundwater in manukan island, Sabah

Abstract

Geochemical data on dissolved major consituents in groundwater samples from Manukan island reveal the main processes responsible for their geochemical evolution. The results of analysis showed that the groundwater was chemical highly enriched with Na+ and Cl- an indication of seawater intrusion into the aquifer as also suported from the Na-Cl signature on the Piper diagram. From the PHREEQC simulation model, calcite, dolomite and aragonite solubility showed positive values of the saturation indeces (SI) indicating supersaturation which lead to mineral precipitation condition of water by these minerals.