Investigations regarding thin-layer chromatographic behavior of seventeen anions have been conducted on silica gel impregnated with inorganic salts such as copper sulfate, zinc sulfate, cobalt chloride, hexamine cobalt III chloride, and nickel chloride using mixed aqueous-organic eluents containing formic acid. The effect of mineral acids on the mobility of anions has also been studied by substituting formic acid with HCl, H 2SO 4, or HClO 4 in the mobile phase. In addition to microgram separation of NO 2 − and IO 3 − from various anionic species, some other important qualitative separations have also been realized. The effect of pH of the sample solution and loading amount of IO 3 −, BrO 3 −, NO 2 −, and I − on their R F values has been investigated. The limits of identification for all anions on impregnated layers have been determined. Semiquantitative determination of NO 2 − and BrO 3 − have been attempted using the spot area measurement method.