【摘要】 本 文研究了新显 色试剂 ８喹啉偶氮 槲皮素（简 称 ８ Ｑ Ａ Ｑ）的合成 方法及其 理化性质， 显色性能 和与 Ｆｅ（Ⅲ）的显色反应条件。在 Ｔｗ ｅｅｎ ８０ 存在下，ｐ Ｈ＝ １０．３ 的 Ｎ Ｈ３  Ｎ Ｈ４ Ｃｌ缓冲介质中 ， Ｆｅ（Ⅲ）与 ８ Ｑ Ａ Ｑ 的络合物 在 ５００ｎｍ 处有最大吸收， 表观摩尔吸光系数 为 １．０６×１０５ Ｌ·ｍ ｏｌ－ １ ·ｃｍ － １ ， Ｆｅ（Ⅲ） 含量在 ０－ ２．６μｇ／１０ｍ Ｌ 范围内符合比耳定律。在室温下，络合物 至少稳定 １５ｈ，络合比为 １∶ ３。此法用于茶叶中微量铁（Ⅲ）的测定，结果令人满意。更多还原

【Abstract】 Study on the Colour Reaction of Fe(Ⅲ) with a new Colour Reagent 8Quinine Azo Quercetin$$$$ LEI LiHong LEI ChunHua (Department of Analytical Chemistry,Hunan Medical College,Changsha 410006,P.R.China) LUO MingHui (Department of Chemistry,Hunan University,Changsha 410082,P.R.China)$$$$Abstract The synthesis of 8quinine azo quercetin (8QAQ) is described and the colour reaction of 8QAQ with Fe(Ⅲ)has been studied.In a medium of pH=10.3,the complex of Fe(Ⅲ)with 8QAQ is formed at 50℃ within 10min.The complex has a maximum absorption at 500nm with a molar absorptivity of 1.06×105L·mol -1 ·cm -1 .Beer′s low is obeyed for Fe(Ⅲ)in the range of 0-2.6μg/10mL. The complex of which composition Fe(Ⅲ)∶8QAQ=1∶3 is stable within 15 hours.The method has been applied to the determination of Fe(Ⅲ)in tea. Key words 8Quinine Azo Quercetin,Fe(Ⅲ),Colour Reaction,Spectrophotometry.更多还原