Determination of heavy metal concentrations in street dusts in Istanbul E-5 highway
Components and quantity of street dust are environmental pollution indicators especially in big cities. Street dust is generally composed of car exhaust gas originated particles and wind-transported particles. Heavy metals, which are found in street dust, such as Pb, Cu, Mn, Zn, Cd and Ni are significant for environmental pollution. 
Heavy metal concentrations in roadside soils and correlation with urban traffic in Beijing, China
A detailed investigation was conducted to study the heavy metal concentrations in roadside soils of Beijing. The concentrations of Cd, Cu, Pb and Zn showed a decreasing trend with increasing distance from the road while such trend was not identified in As, Cr and Ni. In addition, the concentrations of Cd, Cu, Pb and Zn significantly positively correlated with black carbon (BC) and TOC (p < 0.01). 
Soil heavy metal concentrations, microbial biomass and enzyme activities in a contaminated grassland ecosystem
Soil enzyme activities and microbial biomass were measured in a grassland ecosystem with a wide range of heavy metal concentrations ranging from 7.2 to 48.1 mmol kg−1 (As, Cd, Cr, Cu, Ni, Pb and Zn) in portions of the U.S. Army’s Aberdeen Proving Ground, Maryland, U.S.A. Total and fluorescein diacetate active (FDA) fungal biomass, FDA-active bacterial biomass, substrate-induced respiration (SIR), the activity of N-acetylglucosaminidase, β-glucosidase, endocellulase, and acid and alkaline phosphatases were also measured. 
Heavy Metal Concentrations in Soil from Selected Rice Farms at Cheju, Zanzibar
Advancement of science and technology has enhanced the use of chemical products, such as fertilizer and pesticides, into agriculture to improve yield. Normally, these products contain metals which are detrimental to human health. These metals may be absorbed by plants and hence be introduced into food chain. In this study, samples of soil from Cheju rice farms were analyzed for heavy metals associated with agrochemicals using Energy Dispersive X-ray Fluorescence (EDXRF) Spectrometry. Sixty soil samples were collected from Cheju rice farms and 10 control samples were collected from Mwera about 25 km from Cheju. 
Heavy Metal Concentrations in Some Vegetables Grown in a Farm Treated with Urban Solid Waste in Kuru Jantar, Nigeria
The use of dumpsite soils as organic manure is wide spread in developing countries like Nigeria. This study investigates the concentration of some heavy metals in vegetables grown in a farm treated with dumpsite soils in Kuru Jantar, Nigeria. Soil samples and vegetables from the farm were collected and prepared using standard analytical procedures. The concentrations of metals in both soil and vegetables were determined using atomic absorption spectrophotometer (AAS). The results showed that the farm was polluted with the metals (Cd, Cr, Cu, Mu, Fe, Pb, Zn, Ni) determined. The Enrichment Factor (EF) showed that some metals had minimal enrichment while Cd (13.93) had significant enrichment at the farm. 
 Sezgin, N., Ozcan, H.K., Demir, G., Nemlioglu, S. and Bayat, C., 2004. Determination of heavy metal concentrations in street dusts in Istanbul E-5 highway. Environment international, 29(7), pp.979-985.
 Chen, X., Xia, X., Zhao, Y. and Zhang, P., 2010. Heavy metal concentrations in roadside soils and correlation with urban traffic in Beijing, China. Journal of hazardous materials, 181(1-3), pp.640-646.
 Kuperman, R.G. and Carreiro, M.M., 1997. Soil heavy metal concentrations, microbial biomass and enzyme activities in a contaminated grassland ecosystem. Soil biology and biochemistry, 29(2), pp.179-190.
 Mohammed, N.K. and Makame, R.K., 2015. Heavy metal concentrations in soil from selected rice farms at Cheju, Zanzibar. Current Journal of Applied Science and Technology, pp.1-7.
 Nanven, N.D., Egila, J.N. and Lohdip, Y.N., 2015. Heavy metal concentrations in some vegetables grown in a farm treated with urban solid waste in Kuru Jantar, Nigeria. Current Journal of Applied Science and Technology, pp.139-147.