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用新合成的偶氮试剂２－（５－硝基－２－吡啶偶氮）－５－二甲氨基苯胺（５－ＮＯ＿２－ＰＡＤＭＡ）研究了光度法测定他的反应条件。结果表明，在０．４５～１．２ｍｏｌ／Ｌ盐酸介质中，钯与试剂形成稳定的蓝色配合物，其最大吸收波长位于６２１ｎｍ处，表观摩尔吸收系数为９．４×１０￣４Ｌ·ｍｏｌ￣（－１）·ｃｍ￣（－１），配合成的组成为Ｐｄ：５－ＮＯ＿２－ＰＡＤＭＡ＝１：２，钯浓度在０～１０μｇ／１０ｍＬ范围内符合比尔定律。本方法是目前测定钯的高灵敏度和高选择性体系之一。用于含钯分子筛及二次合金管理样－８８中微量钯的测定，结果满意。
The reaction conditions of his spectrophotometry were studied with the newly synthesized azo reagent 2- (5-nitro-2-pyridylazo) -5-dimethylaminoaniline (5-NO_2-PADMA) The results showed that the palladium and the reagent formed a stable blue complex in 0.45 ~ 1.2mol / L hydrochloric acid medium, the maximum absorption wavelength was at 621nm, the apparent molar absorption coefficient was 9.4 × 10 ~ 4L · mol ~ (-1) · cm ~ (-1), and the composition of Pd: 5-NO_2-PADMA = 1: 2. Beer’s law was obeyed in the range of 0 ~ 10μg / 10mL. This method is one of the most sensitive and highly selective systems for the determination of palladium. For the determination of trace palladium in palladium-containing molecular sieve and secondary alloy sample-88, the results were satisfactory.