Open AccessHydrogeology And Hydrochemistry Of Shallow Groundwater And Surface Water And Potential Water Pollution In Gadung District, Buol, Central Sulawesi
Author(s) -
Zikri Yanti,
Doni Prakasa Eka Putra,
Heru Hendrayana
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1363/1/012050
Subject(s) - groundwater , hydrology (agriculture) , hydrogeology , pollution , surface water , environmental science , alkalinity , water quality , geology , environmental engineering , chemistry , ecology , geotechnical engineering , organic chemistry , biology
Inhabitants of Gadung District depend on Labuton River and shallow groundwater as their water resources. But issue of river pollution caused by gold mining activities operated for decades around upstream area of Labuton River becomes challenge for their water demands. In the other hand, shallow groundwater from dug wells has low resistance for contaminants from urban activities around downstream area. This study aims to analyze characteristics of hydrochemistry and to identify pollution cases in research area. In order to recognize flow path of shallow groundwater water table in research area have been measured.EC, pH, and TDS from water samples (13 samples from Labuton River and 16 samples from groundwater) has been measured. Na+, K+, Ca 2 +, Mg 2 +, F - , Cl - , NO 3 - , SO 4 2- concentrations of the samples measured using Ion Chromatograph. HCO 3 - concentrations of the samples measured using Alkalinity Checker. Hydrochemistry Labuton River which is dominantly associated with Dolokapa Formation is controlled by rock weathering process. It is indicated by TDS 50 - 200 mg/L and total cationic charge 428,7 - 2973,8 μeq/L. Labuton River and shallow groundwater in research area has hydrofacies Mg+HCO 3 type generally, but Mg+SO 4 type is shown along ± 5.2 km of water flow of Labuton River from mining area to the downstream zone which is categorized as MIW (Mining Influenced Water). MIW in Labuton River has high concentration of SO 4 2- (9.27 to 35.12 - 36.03 mg/L), high TDS value (100 to 140 - 160 mg/L), and low pH (6.3 to 5.4 - 5.6) from its original water. Labuton River water is polluted by contaminant from mining activity along ± 2.8 km water flow indicated by pH 5.4 - 5.6. Groundwater in some part of study area is polluted by urban contaminant indicated by concentration NO 3 - > 3 mg/L (3.33 - 19.43 mg/L).