The results of thermal analysis received in this work are
presented in Figs. 2, 3 and 4. The main mass loss of
dehydration of different hydrates occurs up to 500 C. That
it why, this region was only presented for more clear display
of the differences in shapes of TG, DTG and DTA
curves. Total mass loss occurring up to 500 C was
assumed as the amount of water bound in hydrates.