HYDROGEOGHEMICAL ANALYSIS OF THE RIVER WATER AT NICKEL MINE AND SURROUNDING, MOROWALI REGENCY, CENTRAL SULAWESI

• Main Author: Maharani, Anindya
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/85155
• Institution: Institut Teknologi Bandung

The rivers around the nickel mining area have water chemistry characteristics that may be influenced by the lithological composition. A hydrogeochemical study 0f the river water can determine the chemical composition and classify the river water type from the samples obtained. This hydrogeochemical study was conducted in Morowali Regency, Central Sulawesi Province, Indonesia. The study was carried out on several rivers around the nickel mining area, including River A, River B, River C, and River D. During the observation, physical parameter measurements and field sampling were conducted. The measurement 0f physical properties produced several parameters such as temperature, total dissolved solids, dissolved oxygen, salinity, turbidity, pH, oxidation-reduction potential, and conductivity. Furthermore, laboratory tests such as isotope lesting, ion chromatography, and inductively coupled plasma mass spectrometry (ICP-MS) were performed. The results from the laboratory data processing of stable isotope compositions of deuterium and oxygen-18 showed that the samples originated from meteoric water interacting with rocks. lon chromatography revealed that the water type is magnesium bicarbonate, resulting from the dissolution 0f silicate hydration (Fe, Mg)SiO4 in samples B, C, and D, while sample A showed a mixed water type, indicating a different process, namely mixing with seawater. The results from the inductively coupled plasma mass spectrometry (ICP-MS) laboratory data processing indicated a waler type containing rare earth elements, dominated by Light Rare Earth Elements (LREE), particularly Europium which is associated with olivine rocks.