The thermal behaviours of Mn(II), Fe(II), Fe(III), Co(II), Ni(II), Cu(II), Zn(II), Ag(I), Cd(II), Pb(II), and VO(II) benzenesulphonates were studied by simultaneous thermoanalytical methods (DTA, TG, DTG, EGA). The measurements were at times supplemented by X-ray analysis of the decomposition products, as well as by chemical analysis. The decomposition processes of samples were carried out in oxygen, in air and in nitrogen atmospheres. The effect of the atmosphere on the decomposition was studied primarily with regard to the reaction paths of the sulphur content of compounds investigated. The possibility of quantitative analysis of these salts was studied from the aspects of both residues and the sulphur oxide products.