摘要
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。
A new water soluble color reagent 1 (5 bromo 2 pyridylazo) 2,7 hydronaphthoquinone 6 sulfonic acid (5 Br PADN S) was synthesized. Its analytical properties for the spectrophotometric determination and its color reaction with Zn (II) in aqueous solution have been studied. The molar ratio of Zn (II) to 5 Br PADN S was found to be 1∶2. The maximum absorption of the complex is at 542 nm with the molar absorptivity of 6.38×10 4L/(mol·cm). Beer's law is obeyed in the range of 0~20 μg/10mL for zinc. The reagent has been used for the determination of microamounts of zinc in human hair,milk powder and ore samples with satisfactory results. No separation is required.
出处
《分析试验室》
CAS
CSCD
2000年第1期1-4,共4页
Chinese Journal of Analysis Laboratory
