Impact of traffic density on roadside pollution by some heavy metal ions in Madinah city, Kingdom of Saudi Arabia
واصفات البياناتعرض سجل المادة الكامل
In this study, the impact of traffic activities on K, Cr, Ir and Pd heavy metals ion concentration of roadside soil of Madinah city, Saudi Arabia. Surface and 20 cm under surface soil samples from 12 different sites were collected and analyzed. The measured concentration of the four heavy metal ions was correlated to the traffic density which was monitored in roads near the sampling sites. In addition, a comparison was made between the concentration and those of Zn and Pb investigated previously. The results revealed significant dependence of Cr and Ir on traffic density with correlation coefficients of 0.948 and 0.898, respectively. The other two metals, K and Pd showed no dependence on traffic density and no dependence between the surface and under surface concentration. The values of pollution indices such as contamination factor, degree of contamination and geo-accumulation index indicated various levels of contamination in the roadside soil. The degree of contamination values in the most five polluted sites were 258.718, 180.854, 142.737, 88.477 and 79.153, corresponding to the airport road (1), Taibah University street (2), Orwah Valley street (3), Qubaa Municipality (4), East Al-Haram area (5), respectively. These results insure that traffic emissions and other anthropogenic activities are major sources of the metal contamination.