Spectrophotometric, chromatographic, polarographic and microanalytical evidence is presented for the identity of the calcium reagents, calcion and calcichrome. The polarographic data favour a bis-azo structure for the compound.
A. E. Mendes-Bezerra and W. I. Stephen, Analyst, 1969, 94, 1117 DOI: 10.1039/AN9699401117
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