Why sulfuric acid only used Residue on Ignition (ROI)analysis but not used nitric acid and some other acids?
We generally check the inorganics by this test by converting it into their sulphates with the treatment of H2S04 and sulphates are very stable at high temperature (about up to 800-1000). while nitrates and chlorides are not stable at high temperature. Hence it is recommended to go for sulphated ash instead of nitrates and chlorides.