微波消解-催化动力学光度法测定茶叶中微量锰  

The Determination for Trace Element Manganese(Ⅱ) inTea by Microware Digestion-Catalytic Kinetic Spectrophotometric

作　　者：崔华莉[1] 柴红梅[1] 折延刚[1] 

机构地区：[1]延安大学化学与化工学院,陕西省化学反应工程重点实验室,陕西延安716000

出　　处：《江西师范大学学报（自然科学版）》2011年第5期529-531,共3页Journal of Jiangxi Normal University(Natural Science Edition)

基　　金：陕西省教育厅专项科研计划(09JK814);延安大学专项科研基金(YD2010-14)资助项目

摘　　要：利用微波消解法前处理样品，同时研究了在pH值为9．2的Na28ν40ν7．NaOH缓冲溶液介质中阳离子表面活性剂溴化十六烷基吡啶对Mn（Ⅱ）催化Hν2Oν2氧化二甲酚橙的褪色反应具有明显的增敏作用，建立了催化动力学光度法测定痕量Mn（U）的新方法．该方法的线性范围为0．04～0．40μg／mL，检出限为0．0096μg／mL．用于茶叶中微量锰（Ⅱ）的测定，回收率为98．3％-102．3％，结果令人满意．Teas were digested in the sealed container by the microwave digestion system A simple and sensitive catalytic kinetic spetrophotometric method for determination of trace manganese（ II ） has been developed in Na2Bν40ν7-NaOH（pH=9.2） buffer solution The method is based on the catalytic effect of manganese on the oxidation of xylenol orange by Hν20ν2. Various surfactants have been studied as enhancing agents in the system. It was found that the cationic surfactant of CPB could improve the sensitivity and the selectivity apparently. Under experimental condition, the linear range of this method was 0.04-0.40μg/mL, the detection limit was 0.009 6 txg/mL and values of recovery in the range of 98.3%-102.3%. This method has been successfully used to the determination of manganese in sample.

关 键 词：微波消解 催化动力学光度法 二甲酚橙 锰 

分 类 号：O657.32[理学—分析化学]