[AHW32-P11] Phosphorus in groundwater in the coastal area of Mataram, Lombok Island, Indonesia
キーワード：リン、地下水、マタラム
Several previous studies of phosphorus in groundwater at highly contaminated sites exist. However, although studies on the behavior of phosphorus in pristine aquifers have been increasing, they are still limited. Urban development in Indonesia’s coastal areas may lead to an increase in groundwater contamination. Mataram City on Lombok Island is a developing area in terms of tourism, and it is important to evaluate the phosphorus in the groundwater prior to the expansion of urban development. Mataram City was therefore selected as the study area for this work and groundwater was sampled at 26 sites.
Our results show that the concentrations of PO43– in groundwater analyzed using ion chromatography range from approximately 0.1 to 8.5 mg/L. Fe concentrations in groundwater at 21 sites was lower than 0.1 mg/L. No correlation was found between the Fe and PO43– concentrations. In addition, no correlation was found between the DOC (dissolved organic carbon) and PO43– concentrations. These results indicate that the DOC and Fe-(hydr) oxides cannot represent the source of P. However, the values of the saturation index of hydroxyapatite for some groundwater samples were close to equilibrium; Therefore, hydroxyapatite may represent the source of P.
Our results show that the concentrations of PO43– in groundwater analyzed using ion chromatography range from approximately 0.1 to 8.5 mg/L. Fe concentrations in groundwater at 21 sites was lower than 0.1 mg/L. No correlation was found between the Fe and PO43– concentrations. In addition, no correlation was found between the DOC (dissolved organic carbon) and PO43– concentrations. These results indicate that the DOC and Fe-(hydr) oxides cannot represent the source of P. However, the values of the saturation index of hydroxyapatite for some groundwater samples were close to equilibrium; Therefore, hydroxyapatite may represent the source of P.