Impact du transport routier sur le dépôt et le transfert du plomb et du zinc dans le sol sur la route Lubumbashi-Likasi (RD Congo)

This work was initiated in order to assess the content of trace metals (TM) from traffic and road infrastructure on a section of national No.1, one linking the cities of Lubumbashi and Likasi in Republic Democratic of Congo. To achieve this, samples of dust on the floor and soil near the road were taken at different depths at the site between the bifurcations of the airport road and Kasenga. Analyses focused on total levels of lead (Pb) and zinc (Zn). The dosage of TM was performed using an atomic absorption spectrometer and measurement pH of soil performed using a pH meter. The results obtained showed that the pH values found (between 5.82 to 7.68) allowed good adsorption and the Zn concentrations were higher than those of the Netherlands standard. However, these levels decreased away from the roadway. Similarly, depending on the depth, the Zn contents were 38.46% (5/13 results) higher than the value of the same standard. However, 38.46% of the values of Pb and 53.85 % Zn (7/13 results) values were higher than those of the standard agricultural soil set by France. These results support the hypothesis that the dust on the floor and close to soils are rich in TM because of contributions due to road traffic.