Analisis Kandungan Logam dan Mineral pada Road Deposited Sediment (RDS) dari Mobil Road Sweeper Berdasarkan Perbedaan Ukuran Partikel

Abstract

A study was conducted to identify the metal and mineral content of Road Deposited Sediment (RDS) from street sweepers based on differences in particle size. RDS is a combination of natural sediments including soil materials, leaf litter and atmospheric particles and anthropogenic sediments generated by vehicle component damage and combustion products, construction materials, road paint and debris from pedestrians. Samples were collected from a street sweeper car. Then, the samples were sieved into three variations of 100, 200, and 300 mesh before analysis. X-ray powder diffraction (XRD) was chosen to detect the main components, namely minerals, silicates and albite. Dust particles were analyzed by scanning electron microscope and energy dispersive X-ray analysis (SEM-EDX) showed in the three samples with variations in mesh size, the same mineral content of silica (SiO2) and albite (NaAlSi3O8) was obtained in each as well as the metal content of Aluminum (Al), Iron (Fe), Calcium (Ca), Potassium (K), and Sodium (Na). The percentage of mass composition (%mass) in Aluminum (Al) and iron (Fe) metals in each variation is at 100 mesh obtained 4.14% (Al) and 2.54% (Fe). At 200 mesh obtained 5.24% (Al) and 13.43% (Fe). And at 300 mesh obtained 8.21% (Al) and 18.17% (Fe). From these results it can be seen that the metal content has increased in %mass with the smaller particle size. This is because the smaller the particle size, the sediment will have a larger specific surface area, the higher the content of minerals and inorganic materials. Where the more specific surface area, the more effective the sediment is able to absorb these metal elements and also the smaller the particle size, the dust can move more easily and reach a wider area in the absorption of inorganic materials such as metals.