A new fluorescent reagent 2-amino-5,7-dimethyl-1,8-naphthyridine (ADMND) was proposed for the determination of trace nitrite. The reaction is based on the diazotization of naphthyridine amine with nitrite to form a diazonium salt that hydrolyzed when boiling to give hydroxyl group substituted naphthyridine. Fluorescence quenching degree of ADMND by nitrite ion is linear in the nitrite concentration range of 1 x 10(-7) to 2.5 x 10(-6)mol l(-1) with a detection limit of 4.06 x 10(-8)mol l(-1). Reaction and determination acidity for nitrite is the same which made the method much simpler compared with the widely accepted fluorescence method with DAN as a fluorescence reagent.

中文翻译：

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2-氨基-5,7-二甲基-1,8-萘啶作为荧光试剂，用于测定亚硝酸盐。

提出了一种新型的荧光试剂2-氨基-5,7-二甲基-1,8-萘啶（ADMND）测定亚硝酸根。该反应基于萘啶胺与亚硝酸盐的重氮化以形成重氮盐，该重氮盐在沸腾时水解，得到羟基取代的萘啶。亚硝酸根离子对ADMND的荧光猝灭程度在1 x 10（-7）至2.5 x 10（-6）mol l（-1）的亚硝酸盐浓度范围内是线性的，检出限为4.06 x 10（-8）mol l（-1）。与以DAN为荧光试剂的广为接受的荧光法相比，亚硝酸盐的反应和测定酸度相同，这使该方法更加简单。