STUDIES ON ANALYTICAL FUNCTIONAL GROUPS OF ORGANIC REAGENTS USED IN INORGANIC ANALYSIS——II.ON REAGENTS FOR ANTIMONOUS IONS

Three types of Sb~Ⅲ reagents were studied.They are:(1)the compounds containing mer- capto group,(2)Caille and Viel reagents and(3)the compounds containing two phenolic groups in adiacent positions. It was shown experimentally that the first two types of reagents give reactions with very low selectivities.Moreover,the selectivities could not be improved by merely varying the structure of the organic compounds. The diphenolic compounds seem to be the most hopeful reagents for Sb~Ⅲ.Their reactions are considerably selective.Several classes of coloured compounds containing two phenolic groups in adjacent positions were prepared.Some of them were found to be satisfactory reagents for Sb~Ⅲ.