Norwitz G, Keliher P N
Chemistry Department, Villanova University, Villanova, PA 19085, U.S.A.
Talanta. 1982 May;29(5):407-9. doi: 10.1016/0039-9140(82)80178-1.
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.
提出了一种分光光度法，用于测定痕量苯胺。该方法包括在醋酸钠介质中进行重氮化反应，与N-(1-萘基)乙二胺偶合，用氯仿萃取黄色染料，然后将其转化为红紫色染料。有两种转化方法。第一种方法是将氯仿萃取液与盐酸振荡，使染料转化并转移到水相中。另一种方法是将氯仿萃取液蒸发至干，残渣溶于冰醋酸中。盐酸萃取法更快。两种方法的最低检测限分别为0.8和0.6微克/毫升。两种方法都具有令人满意的准确度和精密度。
