a> 



CL 



E 



320 



300 - 



280 - 



260 



240 



CURVES 



(NH4)2S04 CURVES 



(NH4),S04 - DTA PEAK IN 

 (NH4)2S04 - DTA PEAK IN AIR 

 (NHJ2HPO4 - DTA PEAK IN N, 



■ (NH4)2HP04 - DTAPEAK IN AIR 

 o DTG PEAKS IN N. 

 DTG PEAKS IN AIR 



220 



200 



12 16 

 Chemical (percent) 



20 



24 



Figure 4.-Cornpavison of the peak temperatures for chemicals and 



thermal analysis method. 



