In this diploma thesis, the adsorption of copper and nickel ions on humus was studied depending on the different initial concentrations of copper ion (4,814 mmol dm -3 , 9,220 mmol dm -3 , 13,542 mmol dm -3 , 22,695 mmol dm -3 , 33,627 mmol dm -3 ) and nickel ion solutions (4,059 mmol dm -3 , 8,176 mmol dm -3 , 13,471 mmol dm -3 , 21,510 mmol dm -3 , 31,510 mmol dm -3 ) at a constant temperature of 27°C, a stirring speed of 180 rpm for 72 h. The amount of copper ions adsorbed on humus ( qe ) increases slightly with an increase in the initial concentration of copper ions. The amount of nickel ions adsorbed on humus ( qe ) increases with the increase of initial concentration of nickel ions and reaches its maximum value at the highest initial concentration of nickel ions in binary solution. As the initial concentration of copper ions in the solution increases, the adsorption efficiency decreases reaching a value below 10% for the highest initial concentration of ions in the solution. The adsorption efficiency of nickel ions on humus decreases with the increase of initial concentration of heavy metal ions in solution, but to a lesser extent than the adsorption of copper ions. From the results obtained it is evident that the best fitting with the experimental data of copper ions adsorption on humus is reached when Langmuir model was applied, while Freundlich model showed the best fitting for the adsorption of nickel ions on humus.