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Distribution of Lead Accumulation in Roadside Soils : A Case Study from D 100 Highway in Sakarya , Turkey

In this study, it was aimed to determine the lead accumulation that causes significant environmental problems. It indicated that spatial variability of Pb accumulation depended on the distance from the D100 highway alongside agricultural soils in the border of Erenler, a town of Sakarya. In the reasearch area, 160 soil samples were collected from 10 cm depth on ten transects separated by 500 m intervals and perpendicular to the road at distances of 1,5,10,25,50,100,250 and 500 m on the north and south side of the highway within 4.5 km2 area. The content of Pb in soil samples was determined by ICPOES. The results of the analysis were evaluated by SPSS 18 package programme in terms of statistical analysis. Spatial distribution of lead accumulation was mapped by enterpolation technique in the Geostatistical Analyst tool of ArcGIS 10.1 software. According to the results of the study, Pb contents of soil samples taken from the south side of the road were higher than the others collected from the north side. This caseindicated that the effect of predominant wind direction prevailing from the northwest within the research area. Moreover, there was a significant negative relationship between the Pb contents and the distance from the road and that direction. Pb contents tended to decrease as further away from the road and Pb contents in 1, 5, and 10 meters had considerably higher concentrations than the other distances.