Small amounts of toxic organics can be encountered in many industrial wastes and contaminated materials treated by cement solidification/stabilization. Besides, very low levels of organics make incineration processe very expensive and sometimes ineffective. The functional group of the organic compound can be important to determine the type of influence that occurs during the cement hydration process. Tetrachloroethylene, sodium acetate, ethylamine and phenol - four pollutant organics containing different functional groups were used in the experimental work. Three comparative concentrations (0,5; 5,0 and 10 weight percent of the total mix) and different curing times were tested. X-ray diffraction (XRD) has showed the presence of calcium hydroxide, ettringite, calcite and belite. Differential Thermal Analysis (DTA) results confirmed the calcium hydroxide formation that is formed during normal hydration of cements. Leaching tests correlated the Total Organic Carbon (TOC) levels in the leachates with the proportion of the organic compound additioned.