高灵敏分光光度法测定食品中痕量铜-Cu(I)-SCN^--罗丹明 B-PVA 体系  

Highly Sensitive Spectropotometric Determination of Trace copper in Foods

作　　者：尹哲俊[1] 于宝杰[1] 王颖[1] 

机构地区：[1]吉林工学院轻纺系

出　　处：《广东工业大学学报》1997年第S1期91-93,共3页Journal of Guangdong University of Technology

摘　　要：研究了在硫酸介质中，Ｃｕ（Ｉ）－ＳＣＮ－－罗丹明Ｂ体系当有明胶和聚乙烯醇存在时的高灵敏显色反应，该反应的λｍａｘ＝６０５ｎｍ，ε６０５＝２．３×１０５Ｌ·ｍｏｌ－１·ｃｍｏｌ－１，铜在０～６．０μｇ／２５ｍＬ范围内符合比尔定律。用拟定的方法测定大米、面粉等食品中痕量铜，选择性好，灵敏度高，结果满意。A highly sensitive spectrophotometric method for the determination of Cu(Ⅰ) is investigated by use of the colour reaction of Cu(Ⅰ)-SCN --RhB system in the presente of gelalin and PVA. The maximum abscorption wavelength of the complex is 605nm and its apparent molar absorptivity is 2.3×10 5 L\5mol -1 \5cm -1 . Beer′s law is obeyed for copper in the range from 0 to 6.0 μg/25mL. The method has been applied to the determination of copper in food samples with satisfactory results.

关 键 词：铜 罗丹明B 高灵敏度 食品 

分 类 号：O657.32[理学—分析化学]