Heavy metal contamination in sedimentary materials after nickel mining in river Lambuluo Motui, North Konawe, Southeast Sulawesi province

The research is aimed to determine the amount of heavy metal contamination contained in sedimentary materials in River Lambuluo. The types of heavy metal that would be investigated in this research were As3+, Cd2+, Cr6+, Ni2+, and Fe3+. Observation stations were determined purposefully or purposive sampling based on locations or areas with various activities allegedly contributing to the source of the contamination. Observation stations were divided into 3 stations with 3 different days. The research result on the lowest As3+ at Station 1 on day 1 is 0.0005 mg/ L and the highest on Station 3 on day 2, i.e. 0.75 mg/ L, the lowest Cd2+ at Station 1 on day 1, i.e. 0.005 mg/ L, and the highest at Station 3 days on day 2, i.e. 0.011 mg/ L, the lowest Cr6+ at Station 3 on day 2, i.e. 0.0033 mg/ L, and the highest at Station 2 on day 2, i.e. 0.003 mg/ L, the lowest Ni2+ at Station on day 1 is 0.0008 mg/ L, and the highest in Station 2 on day 3, i.e. 0653 m / L, the lowest Fe3+ ion at Station 3 on day 1 is 0.36 mg/ L, and the highest at Station 1 on day, i.e. 1.52 mg/ L.