摘要：Determination of heavy metals (cadmium, lead, zinc and copper) in soil matrixes belongs to essential procedures for environmental monitoring. In spite of the fact that heavy metals are naturally occurred in the soil, a considerable toxicity of their high concentrations has been proven. Electrochemical techniques are effective tool to detect very low heavy metal concentrations in the biological matrixes. However, due to the complexity of the biological sample, a specific extraction step is required to improve the determination. This work is focused on optimization of the extraction procedure of the heavy metals (Cu, Cd, Pb, Zn) from the soil matrix. Seven procedures based on extraction by EDTA, CH3COOH, NaNO3, H2O, KCl and CaCl2 were compared using electrochemical detection carried out by differential pulse voltammetry.
