Thermogravimetric analysis of some metal thiocarbonates and sulphides obtained with potassium thiocarbonate (PTC) reagent

The thiocarbonates of K(I), Tl(I), Pb(II), Cd(II), Cu(II), Co(II), Ni(II), Zn(II), Fe(II) and the sulphides of Ag(I), Cu(II), Cd(II), Hg(II), Bi(III), Mo(VI), Pt(IV), Au(III), V(V), Se(IV), Te(IV), As(III, V), Sb(III) have been studied by thermogravimetric analysis. These studies not only confirm the purity of the precipitated products obtained with PTC but also determine correct temperature ranges for the precipitates to attain constant weight, thereby affording gravimetric evaluations of even mg quantities of the metal ions studied. Purity of precipitated products was made possible with the technique of precipitation from homogeneous solution based on the PTC reagent as precipitant.