The sodium sulphonate groups of the magnesium-reactive component of a commercial Titan yellow are shown to be in the 7-position on each of the benzothiazole rings. Titan yellow synthesised from 2-(p-aminophenyl)-6-methylbenzothiazole-7-sulphonic acid is reliable and sensitive in the determination of magnesium.
H. G. C. King, G. Pruden and N. F. Janes, Analyst, 1967, 92, 695 DOI: 10.1039/AN9679200695
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