A simultaneous TG, DTG, DTA and EGA method was developed for the determination of carbonate, sulphate, pyrite and organic material in minerals. The method is based on the selective direct determination of SO3 and CO2 evolved from the heated sample, and on the indirect determination of H2O. The thermogas-titrimetric adapter of the derivatograph collects the liberated gases (CO2, SO3, SO2) quantitatively, absorbs them in water, and titrates them continuously and automatically with NaOH titrant. The changes in the volume of titrant consumed are recorded as a function of the temperature. In two parallel examinations, one titration is performed at pH 4, and the other at pH 9.3. The former measurement yields only the amount of SO3 (SO2), while the latter gives the joint amount of SO3 (SO2) and CO2.