IRINA PINCOVSCHI, NICOLETA NEACSU, CRISTINA MODROGAN THE ADSORBTION OF LEAD, COPPER, CHROME AND NICKEL IONS FROM WASTE WATERS IN AGRICULTURAL ARGILACEOUS SOILS The aim of this work is the study of te adsorption process of some heavy metals like lead, copper, chrome and nickel in agricultural argilaceous soil in order to put in evidence the influence of adsorption conditions on adsoption process. The adsorption isotherms, Langmuir and Freundlich, have been used to describe the adsorption equilibrium. The experimental data put in evidence that the adsoption capacity of heavy metals increases in order Ni2+ (about 110 micromol/g), Pb2+ (about 150 micromol/g), Cr3+ (about 300 micromol/g) and Cu2+(about 350 micromol/g). In all cases, the Langmuir isotherm reflects more exactly the adsorption process, being recomended for thermodynamic parameters determination.
Key words: industrial waste waters, agricultural argelaceous soils, heavy metal adsortion