摘要
研究了Zn(Ⅱ)-5-Br-PADAP-CPB体系分光光度法。在阳离子表面活性剂溴化十六烷基吡啶(CPB)存在下,在pH=5.60的NaAc-HAc缓冲介质中,锌(Ⅱ)与2-(5-溴-2-吡啶偶氮)-5-(二已氨基)苯酚(5-Br-PADAP)形成稳定的橘红色络合物,其最大吸收波长为557 nm,表观摩尔吸光系数ε=1.14×105L.mol-.1cm-1,锌含量在0～0.56 mg/L范围内符合朗伯比尔定律。加入掩蔽剂后用该方法测定茶多酚锌配合物(TP-Zn)中的锌,结果满意。
The optimum conditions of the Zn （ Ⅱ ）-5-Br-PADAP-CPB system were studied by spectrophotome- try. A stable orange complex of zinc （Ⅱ） with 2-[（5-bromo-2-pyridyl）-azo]-5-diethyl-aminophenol （5-Br- PADAP） is formed in NaAc-HAc （pH=5.60） buffer solution containing cetylpyridinium bromide （CPB）. The experimental results show that the maximum absorption of complex is at 557 nm and its apparent molar absorp- tion coefficient is 1.14× 105 L· mol-1 cm-1. The Beer＇s law is obeyed in the concentration range of 0-0.56 mg/L for zinc （ Ⅱ）. The proposed method has been applied to the determination of zinc in the Zinc （Ⅱ） Complex of Polyphenol with satisfactory result after masking agents was added into the Zinc （ Ⅱ ） Complex solution.
出处
《食品研究与开发》
CAS
北大核心
2013年第1期77-80,共4页
Food Research and Development
基金
河南省国际合作项目(No.084300510023)
关键词
锌(Ⅱ)
5-BR-PADAP
CPB
分光光度法
Zinc （Ⅱ）
2-[（5-bromo-2-pyridyl）-azo]-5-diethyl-aminophenol
Cetylpyridinium Bromide
Spectrophotometry
