“…(5-sulfo-2-hydroxybenzeneazo-2-naphthol) and the applications to analysis of metal ions {964, 965,1063) and oxidation of this and other dyes at the rotating pyrolytic graphite electrode in buffered and unbuffered media (657), and at the rotating pyrolytic graphite electrode (1331,1458) and Eriochrome Black T was studied by dc (93) and dc and ac polarography (1189,1191,1192) while arsenazo- (214) and o,o'-dihydroxyazobenzene (194) were studied by dc polarography. All of these studies also include polarographic data for dyemetal complexes and in some cases are applied to analysis of the metal ion.…”