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Surfaces such as pavements and road surfaces in urban environments usually contain an accumulation of fine solid particles on them. These particles deposited on these surfaces are called road deposited sediments (RDS); also commonly referred to as street dust or road dust. Road deposited sediments are usually a complex mixture of fine solid particles and pollutants obtained from a wide range of urban and industrial sources and processes. Their sources are either as a result of human activities in nature (vehicle tyre and body wear, vehicle exhaust emissions brake-lining material, road salt, atmospheric deposition, building and construction materials or soil material particles, litter obtained from plant and leaf and atmospheric deposition (HOPKE et al., 1980; BACKWITH et al., 1986; XIE et al., 1999; LECOANET et al., 2003; ROBERTSON et al., 2003). The potential health risks and high levels of heavy metal pollution measured in a number of cities of the world have generated a lot of interest in heavy metal pollutions in RDS. Roadways and automobiles are presently considered as the largest sources of heavy metals in the urban environment. The most common heavy metals released from road travel are Zn, Cu and Pb. These account for at least 90 percent of the total metal pollution in road runoff. The accumulation of road dust along pavements in urban environments have the potential to provide considerable loading of heavy metals to receiving waters and water bodies (YISA et al., 2012). These metals are not biodegradable in the environment. This is one of the most important properties of these pollutants which differentiate them from other toxic pollutants. (SEZIFE et al., 2013). The possibility for bioaccumulation and biomagnification is another problem associated with them. This causes an exposure for organisms to higher concentrations of these contaminants than is present in the environment alone. As a result of direct uptake from the surroundings across body walls through respiration and from food, these toxic metals accumulate in organisms (O’NEIL., 1990). Roads are known as the second largest non-point source of creating pollution in urban environment (FAKAYODE & OLUOWOLABI., 2003). Road and highway surfaces are impervious, and serve as temporary sinks for various types of pollutants that are washed off during rainfall to the surrounding environment (CHARLESWORTH, et al., 2003; VIRAD et al., 2004; ROBERTSON & TAYLOR., 2007). Road surfaces receive varying amount Abstract

Contamination Assessment of Heavy Metals in Road Dust of the University of Nigeria, Enugu Campus, Southeastern Nigeria