An investigation was conducted to study the heavy metal concentration and other physico-chemical parameters of the roadside soil in the 2 nd Congressional District of Cagayan de Oro City. The samples were collected from seven different locations and analyzed for pH, conductivity, organic matter, and the heavy metals-Cd, Cu, and Pb. The pH of the soil is in the ranged between 7.85 to 8.54 while the conductivity and organic matter of the soil varies between locations with the highest value of 259

more »

... μS/cm and 5.54%, respectively. The average concentrations of metals in soils were 0.21 mg/kg Cd (ranged between 0.07 to 0.51 mg/kg), 87.7 mg/kg Cu (ranged between 61.0 to 169.7 mg/kg), and 97.6 mg/kg Pb (ranged between 43.2 To 264.0 mg/kg). Overall, the concentrations of heavy metals can be ordered as Pb > Cu > Cd. A higher concentration of heavy metals was observed in the soils collected from areas where there are frequent traffic congestions happen due to high traffic volume. The concentrations of heavy metals in roadside soils of District 2, Cagayan de Oro City were considered medium or low in comparison with those in other cities around the world.