Abstract
Heavy metal contamination in the road dust due to traffic in the capital city of Tajikistan was investigated. Concentrations of potentially toxic elements (Ba, Cu, Cd, Co, Cr, Pb, Ni, Zn and As) in particle size of 63 μm were analyzed. The highest potentially toxic element concentration was Zn (312 mg/kg), whereas the lowest was Co (5.3 mg/kg).The biggest contribution to road dust is atmospheric deposition due to metal traffic density makes slight contribution to heavy metal contamination. According to the calculation on enrichment factor (EF), heavy metals decrease in the order of Sb>Cd>As>Cu>Zn>Pb. The Dushanbe city road dust particles are potentially influenced by minimum three sources of metals including: urban sources (vehicles traffic, etc.); industrial sources (cement, reinforcement plant, etc.); geogenic sources (soils, dusts, rock weathering, etc.).
Highlights
Road dust, an accumulation of solid particles on outdoor ground surfaces, is a valuable medium for characterizing urban environmental quality
Road dust in urban area is an indicator of heavy metal contamination from atmospheric deposition
The capital city of Tajikistan is located in western part country with a population of over 0.82 million
Summary
An accumulation of solid particles on outdoor ground surfaces, is a valuable medium for characterizing urban environmental quality. Road dust in urban area is an indicator of heavy metal contamination from atmospheric deposition. Road dust particles with less than 100 ȝm in diameter are vital component in atmospheric particulate matters due to its suspendability characteristics by atmospheric, vehicle exhaust emissions, and nonexhaust emissions factors.
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