Figure 5
Sulfur K-edge XANES for (a) sodium-based salts [sodium with hydrogensulfate (blue), ethylsulfate (red) and sulfate (black)]; (b) 1-butyl-3-methylimidazolium hydrogensulfate, [C4C1Im][HSO4] (black), and butyldimethylammonium hydrogensulfate, [N4,1,1,0][HSO4] (red). |