[en] The atomic absorption spectrometry of indium was investigated in air-acetylene and nitrous oxide-acetylene flames. The atomic absorptions of indium were significantly interfered by HCl, HClO4, and HBr in both the flames. The chemical interferences can be explained by the formation of diatomic molecules, such as InCl and InBr, the molecular absorption spectra of which were really observed in flames. (auth.)