Penentuan Kadar Logam pada Road Dust Berdasarkan Perbedaan Ukuran Partikel dari Jalan Dr Mansyur

Abstract

This research aims to determine the concentration of heavy metals in road dust sediment with specific particle sizes at the Dr. Mansyur street location. The study was conducted by sieving road dust into particle sizes of 400 mesh, 500 mesh, and 600 mesh, and then analyzing it using X-Ray Diffraction (XRD) to determine the main mineral composition through peak graphs that indicate these minerals. Further, the heavy metal concentration in the dust was specifically tested using Inductively Coupled Plasma – Optical Emission Spectrometry (ICP-OES). For metal concentration analysis using the ICP-OES instrument, a digestion process is required, which involves wet digestion with aqua regia made by mixing concentrated hydrochloric acid (HCl) and concentrated nitric acid (HNO3) in a volume ratio of 15:5. This yielded concentration of cadmium, lead, and zinc at 0.014 ppm, 0.395 ppm, and 3.628 ppm, respectively. The difference in particle size fractions was analyzed with XRD testing to show that each variation had different types of minerals identified, and with ICP-OES testing, fine dust particles from sizes as small as 1 μm to 100 μm could be identified for heavy metal concentrations in road dust. This research is significant in understanding the causes of air pollution from road dust in urban streets, which poses hazards to the public.