Results 



The results of the chemical analysis are presented in table 1. The treated fuel 

 was lowest in ether extractives, highest in ash content, and lowest in heat content. 

 The values for ash content of the dead fuel fell between the treated and green. The 

 dead fuel was highest in extractives and heat content. 



The TGA and DTA indirectly showed the treated fuel to be less flammable. The 

 cellulose endotherm (325° C.) and exotherm (360° C.) on the DTA were of the lowest 

 magnitude for the treated fuel; the endotherm occurring at 215° -220° C. and the 

 exotherm occurring at 280° C. were also the smallest for the treated fuel (fig. 2). 



The TGA in N2 (fig. 3) showed consistent differences between the three fuels. The 

 treated fuel resulted in the highest residue at 450° C, the lowest maximum weight loss 

 rate, and the smallest weight loss from 200° to 375° C. The TGA in air also showed the 

 lowest maximum weight loss rate (fig. 4) for the treated leaves. The dead fuel under- 

 went ignition at about 350° C., but the treated fuel did not ignite until after 440° C. 

 However, no ignition tests were performed to check these phenomena. 



200 300 400 500 



Temperature C 



Figure 2. --Results of DTA for guava leaves showing relative magnitude of changes 

 due to treatment. Ordinate zero position is displaced for curve separation. 



3 



