桑椹红—双氧水褪色光度法测定微量铜  

Fading Spectrophotometric Determination of Copper with Mulberry Pigment-Hydrogen

作　　者：刘欣[1] 王鑫彤[1] 

机构地区：[1]唐山师范学院化学系,河北唐山063000

出　　处：《唐山师范学院学报》2013年第5期16-18,共3页Journal of Tangshan Normal University

基　　金：2011年度河北省人才工程培养基金(A201100265)

摘　　要：建立了桑椹红-双氧水褪色光度法测定微量铜的新方法。考察了酸度、桑椹红色素浓度、双氧水浓度、反应温度、反应时间对铜离子催化双氧水桑椹红褪色反应的影响,得到了测定铜的最佳条件。利用此方法测定绿茶及红茶中铜含量分别为1.881μg·mL-1、0.946μg·mL-1,加标回收率为95%~104%,相对标准偏差分别为0.27%、0.49%。The new method of fading spectrophotometric determination of trace copper with mulberry pigment-hydrogen was established.The effect of the acidity,mulberry pigment＇s concentration,hydrogen peroxide＇s concentration,reaction temperature,reaction time of copper ion catalytic hydrogen peroxide mulberry pigment fade was examined,and the optimum conditions were obtained.Using this method,the copper content of the green tea and the black tea could be determined.They were 1.881 渭g路mL-1and 0.946 渭g路mL-1.The recovery with additional standard achieved 95%~104%,The relative standard deviations were 0.27% and 0.49%,respectively.

关 键 词：褪色光度法 桑椹红色素 铜 双氧水 

分 类 号：O657.32[理学—分析化学]