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Electrochemical detection in flowing system such as liquid chromatograghy has been widely used in recent years. Such detection method offers excellent sensitivity toward electroactive analytes, however, some improvement including pre-' or postcolumn2 derivatization must be necessary for electroinactive species. In this paper we report the concept and experimental demonstration of indirect amperometric detection of an aliphatic primary amine (n-butylamine, BA) whose oxidation potential is rather high as compared to the region of conventional measurements. The principle of the method is illustrated in Fig. 1. Traces A and B correspond to the cyclic voltammograms of BA and N-hydroxyphthalimide (NHPI), respectively, in acetonitrile containing 0.1 M tetraethylammonium perchlorate (TEAP). When both components coexist in the medium, a new oxidation wave develops at a less positive potential (trace C). As reported in our previous work, the prewave can be explained in terms of the formation of a hydrogenbonded complex between the acid and the base.3 Therefore, it is expected that, if NHPI is in exess, the peak height is correlated to the concentration of BA while the observed current is due to the oxidation of NHPI (or NHPI-BA complex). Let's consider a situation that an acetonitrile solution containing NHPI and the supporting electrolyte is flowing the line connected to an amperometric detector, of which electrode potential is maintained at, for example, 0.7 V. Since NHPI itself is not oxidizable

Indirect Amperometric Detection of Aliphatic Amine in Flow System