| dc.description.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. | en_US |
