X-ray fluorescence (XRF) spectroscopy was usedto assess the effectiveness of various mild pretreatMent methods for improving the fuel quality of banagrass, a tropical grass. Three types of pretreatment were used with increasing levels of severity: (i) S1 involves dewatering (pressing) only, (ii) S2 where the sample is pressed and leached, and (iii) S3 where pressing-leaching-pressing process is used. In addition, the influence of particle size (2 or 60-80 mm), leaching water temperature (25 or 75 degrees C), and leaching time (1 or 3 min) On the extraction of inorganic elements was examined`. The results show that the S3 pretreatment is the most effective and that reducing the particle size has,a more significant effect than increasing leaching temperature Or time. Using a 2 Aim particle size at 75 degrees C for 3 min produced the greatest effect, removing 50-60 wt % of the Na, similar to 65 wt % Mg,similar to 90 wt % P,similar to 90 wt % wt % K, similar to 55 wt % S, and similar to 95 wt % Cl. USing dewatering alone (S1) to pretreat the banagrass was the least effective approach. The S2 pretreatment produced results that are midway between the S1 and S3 results. However, using small particle's with the S2 method gives similar results tolprocessing large particles using the =S3 approach.