Spectrophotometric determination of trace amounts of aniline by diazotization coupling with N-(1-naphthyl)ethylenediamine and extraction.
A spectrophotometric procedure is proposed for the determination of trace amounts of aniline by diazotization, coupling with N-(1-naphthyl)ethylenediamine in sodium acetate medium, extraction of the yellow dye with chloroform, and conversion into a reddish purple dye. Two methods are available for the conversion. In the first, the chloroform extract is shaken with hydrochloric acid and the dye is converted and transferred into the aqueous phase. In the other, the chloroform extract is evaporated to dryness and the residue is dissolved in glacial acetic acid. The hydrochloric acid extraction method is the more rapid. The minimum detection limits for the two methods are 0.8 and 0.6 mug/ml respectively. Both methods show satisfactory accuracy and precision.
Norwitz
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Chemistry Department, Villanova University, Villanova, PA 19085, U.S.A.
Keliher
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PN