A thin-layer chromatographic method is presented that is suitable for use as a limit test for 4-chloroacetanilide in phenacetin. 4-Chloroacetanilide is detectable at 0·01 per cent., but the test may be made more stringent by suitable adjustment of sample size. The method has been applied on a collaborative basis to samples of phenacetin and to several commonly used tablets containing phenacetin.
Analyst, 1967, 92, 290 DOI: 10.1039/AN9679200290
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