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本文研究了新显色剂２－（５－ＮＯ２－２－吡啶偶氨）－５－二乙氨基酚（５－ＮＯ２－ＰＡＤＡＰ）与镍的显色反应及分光光度测定镍，在ＰＨ３．５乙醇水溶液中，镍与５－ＮＯ２－ＰＡＤＡＰ形成稳定的深色配合物，最大吸收在５６５ｕｍ处，摩尔吸光系数为．１．５７×１０５Ｌ·ｍｏｌ（－１）·ｃｍ（－１），镍在０～１２μｇ／２５ｍＬ范围内服从比尔定律，用此法测定钢铁及茶叶中的微量镍，结果令人满意。
In this paper, the color reaction of 2- (5-NO2-2-pyridylazo) -5-diethylaminophenol (5-NO2-PADAP) with nickel and its spectrophotometric determination of nickel were studied. In ethanol aqueous solution, nickel and 5-NO2-PADAP form a stable dark complex with a maximum absorption at 565 μm and a molar extinction coefficient of 1.57 × 105L · mol (-1) · cm (-1). Beer ’s law was obeyed in the range of 0 ~ 12μg / 25mL. The method was applied to the determination of trace nickel in steel and tea with satisfactory results.