Disodium salts of several anthraquinone-disulfonic acids, which possess large molar absorptivity, were employed as the visualization agent for microcolumn Ion chromatography with indirect photometric detection. Detection limits of inorganic anions were improved, e.g., concentration detection limits of chloride, nitrate and sulfate were 0.91-1.6μmol/L-1 at S/N=3, COrresponding to mass detection limits of 18-32μmol. The present system was applied to the determination of inorganic anions in tap water.