Study of the Effect of Physical and Chemical Parameters of Agricultural Soil on Lead Concentrations PDF

Keywords

soil pollution, road traffic, soil physical and chemical parameters, lead mobility

Abstract

Lead (Pb), originating from road traffic, is a toxic metal for the soil, the plant and ground water. The objectives of this work are to determine the effect of the physicochemical parameters of road traffic's soil on the mobility of lead. The results obtained show that the concentrations of Pb of road traffic ongin exceeded the set standards (AFNOR, 1996). However, these concentrations are influenced by a number of physical and chemical parameters of the soil: the lead concentrations increased with the rate of clays, soil pH and the cationic exchange capacity. We also noted that the concentrations of lead are high on the surface of the soil reaching 3200 ppm, then it decreases with depth to reach 680 ppm, but they always exceed the set standards, thus threatening groundwater. This situation, which threatens agricultural lands and groundwater by pollution can be controlled by using unleaded gasoline, and installing water channels at the edge of the road, for draining the rainwater which is rich in heavy metals coming from road traffic and by the renewal of the automobile park