TRANSPORT MECHANISM OF THE ANTHROPOGENIC LEAD ALONG I40 NEAR BARSTOW, CALIFORNIA
For this study, soil samples were analyzed using Microwave Plasma Atomic Emission Spectrometry (MP-AES). Soil samples were collected at the distance of 20, 40, 60, 100, 250, and 320 m away from the road margin and at depths of 0-15, 20, and 50 cm. The ground surface profile gently sloped away from the road. Average background concentration level is about 37 ppm and the highest concentrations are up to 3.5 times higher than background. Total lead concentration generally decreases with the increasing depth and distance from the road. Highest lead concentration is mainly in the top soil layer at 0-15 cm depth, with concentration decreasing almost to the background level at a depth of 50 cm. Highest lead concentration is generally found at 20 m from the road, decreasing almost to the background level at the distance of 40 m, 60 m, and 100 m. We will compare ground profiles sloping towards and away from the road and different compass orientations to compare the transport mechanisms of surface runoff relative to prevailing winds in future studies.