Etude de la pollution du sol de la région de la ville de Sétif.

Abstract

Heavy Metal Contamination (MTE) is a serious problem that threatens the soil environment and human health around the world. The aim of this work was to study the spatial distribution of the following elements: Cd, Cr, Cu, Pb and Zn for 36 soil samples, including 16 samples taken from a regular 3 * 3 km grid and 20 samples taken from a large area around the town of SETIF. We have studied the physicochemical properties namely pH, organic matter (OM), limestone (CaCO3) and total nitrogen (N). The samples were analyzed by flame atomic absorption spectrometry (SAAF). To identify the concentrations and sources of ETM and assess the quality of the soil environment, 36 soil samples were collected in the town of SETIF in which the average concentrations of Cr, Cu, Pb and Zn were respectively 43, 35; 43.75; 78.26 and 331.2 mg / kg, soil pH values vary between 7.7 and 8.4. However, the concentration of Cd in 36 samples is below the detection limit. The spatial distribution maps indicate that Pb and Zn were mainly controlled by anthropogenic activities, whereas Cr and Cu could be mainly represented by parent soil materials. ETM contaminations in urban soils were assessed using the Geoaccumulation Index (Igeo), Pollution Indexes (PI) and Integrated Pollution Indexes (IPI). About 80-87% of the soil samples were moderately or heavily contaminated with Pb and Zn. The spatial distribution of the IPI showed that ETM pollution levels are higher in urban areas than in agricultural areas. In addition, the main sources of minerals in the soil are also different. At the same time, we have distinguished the richness of the soil collected by the iron.