Persebaran Suspensi-Resuspensi Debu Jalan dan Analisis Konsentrasi Besi, Seng, dan Tembaga dalam Debu Jalan di Tol Belawan

Abstract

The main sources of non exhaust emissions (NEE) that contribute to road dust are tire wear particles, brake wear, road surface wear and road dust suspension resuspension (RDS). This research is an effort to identify the elemental composition of road dust and its distribution on the Belawan toll. Road dust was collected using a vacuum and analyzed for its elemental composition at varying sizes of 149 μm and 74 μm using X Ray Fluorescence (XRF). Then digestion was carrired out using 63% nitric acid (HNO3), 37% hydrochloric acid (HCl), 30% hydrogen peroxide (H2O2) and the concentration of iron, zinc, and copper metals were analyzed specifically using an Atomic Absorption Spectrophotometer (AAS) with the wavelength of each metal being 248.3 nm; 213.8nm; and 324.7 nm. The result of XRF with a size variation of 149 μm showed that iron, zinc, and copper concentration were 6,126,%; 0,0643%; and 0,0120%. Meanwhile, the 74 μm variation is 5,91%; 0,0758%; and 0,0159%. The SSA results showed that the metal concentration of iron, zinc, and copper were found that the concentration of zinc and copper decreased with increasing overall particle size. Next, digestion was carried out using the metal concentrations of iron, zinc and copper were 202,8 mg/L; 6,6 mg/L; and 0,762 mg/L. RDS was absorbed using an impinger containing a mixture of 40 mL of aquadest and 10 mL of 96% ethanol. Sampling was carried out at a distance of 50 meters, 100 meters, and 150 meters from the Belawan toll intersection. Obtained RDS concentration of 28471,2 μg/m3; 28449,5 μg/m3 and 6069,3 μg/m3. Prediction of the distribution of RDS using the line source method resulted in calculations of RDS at each point of 1454,86 μg/m3, 574,79 μg/m3, and 283,16 μg/m3. The decrease in RDS concentration at each point can be influenced by various factors, such as wind speed, speed of passing vehicles, type of vehicle, average speed, braking, and road surface conditions.