ASSESSMENT OF POLLUTION LEVEL AND ANALYSIS OF CROM’S CHEMICAL SPECIATION IN ROAD DUST AT SOME INDUSTRIAL PARKS

Abstract

This study analyzed Cr’s total concentration and chemical fractions in road dust samples from industrial zones to evaluate pollution levels. According to Tesser's sequential extraction procedure, the chemical fraction of Cr in road dust samples was measured by the ICP-MS method, with total Cr recovery ranging from 96.5% to 102%. The results showed that Cr exists mainly in the residual fraction (F5 - 58.9%) > organic bound fraction (F4 - 18.3%) > Fe/Mn oxide bound - fraction (F3 - 13.0%) > exchangeable fraction (F1: 5.52%) > carbonate bound fraction (F2: 4.31%). We also apply pollution indices such as the geological accumulation index (Igeo), the individual pollution factor (ICF), and the risk assessment index (RAC) to assess the pollution level of Cr in the studied area. Igeo values ​​of Cr in the samples are all < 0, indicating no geological risk. The mean value ​​of the ICF was 1.32 (0.64-1.74), the RAC ranged from 6.64% to 22.0%, with a mean value of 15.7%. According to ICF and RAC, Cr concentrations in most studied samples in industrial zones are classified as low pollution and risk.