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报道了水溶性 １－（５－溴－２－吡啶偶氮）－２，７－萘二酚－６－磺酸（５－Ｂｒ－ＰＡＤＮ－Ｓ）的制备方法及其分析特性。研究了此试剂与锌（Ⅱ）等金属离子在水溶液中直接测定的显色反应，在ｐＨ １０．０～１１．４ 的Ｎａ２Ｂ４Ｏ７～ＮａＯＨ 缓冲溶液中，５－Ｂｒ－ＰＡＤＮ－Ｓ与锌（Ⅱ）形成２∶１ 的紫色配合物，最大吸收波长位于５４２ ｎｍ ，表观摩尔吸光系数ε５４２＝ ６．３８×１０４ Ｌ／（ｍ ｏｌ·ｃｍ ），锌量在０～２０ ｍ ｇ／１０ Ｌ范围内符合比耳定律。在掩蔽剂的存在下，用于人发、奶粉及矿石等试样中锌的测定，结果与ＡＡＳ法一致。
The preparation and analytical characteristics of water-soluble 5- (5-Br-PADN-S) -2,7-naphthalene-6-sulfonic acid were reported. The color reaction of this reagent with zinc (Ⅱ) and other metal ions in aqueous solution was studied. The reaction of 5-Br-PADN-S and zinc (Ⅱ) in Na2B4O7 ~ ) Formed a purple complex of 2: 1, the maximum absorption wavelength was at 542 nm, the apparent molar absorptivity ε542 was 6.38 × 104 L / (m ol · cm), the amount of zinc was in the range of 0-20 m g / 10L Within the law with Beer. In the presence of masking agent, used for human hair, milk powder and ore and other samples of zinc determination, the results consistent with the AAS method.