Abstract
Abstract Eight laboratories participated in a collaborative study of a high performance liquid chromatographic procedure for determining sulfanilic acid, Schaeffer's salt, 4,4´-(diazoamino)-dibenzenesulfonic acid (DAADBSA), and 6,6´-oxybis(2-naphthalenesulfonic acid) (DONS) in FD&C Yellow No. 6. The standard deviations for one analysis in any one laboratory for sulfanilic acid at 0.2%, Schaeffer's salt at 0.26%, DAADBSA at 0.1%, and DONS at 1.0% were 0.015%, 0.014%, 0.018%, and 0.077%, respectively. The method has been adopted as official first action.
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