摘要
在0．05mol·L^-1柠檬酸-柠檬酸钠（pH3．0）的底液中，采用循环伏安法测定焦性没食予酸，得到一良好的氧化峰，峰电位Ep=＋0．40V，峰电流Ip与焦性没食予酸的浓度在7．930×10^-6-1．031×10^-4mol·L^-1范围内成线性关系，相关系数r=0．9992，检出限为7．930×10^-6mol·L^-1。采用本法测定工业焦性没食予酸中焦性没食子酸的含量，平均回收率在101．0％。并且研究了焦性没食子酸在玻碳电极上的电化学行为，结果表明焦性没食予酸的电极过程具有扩散性和不可逆性。
By using cyclic vohammetry, the Pyrogallol shows a sensitive derivative oxidation peak at ＋ 0. 40V in a buffer solution of 0. 05 mol· L^-1 citric acid monohydrate- trisodium citrate dehydrate（pH3.0） . The peak current is proportional to the concent ration of Pyrogallol in the range of 7. 930 × 10^-6 - 1. 031 × 10^-3 mol· L^-1 with r = 0. 9992. The detection limit is 7. 930 × 10^ -6 mol· L^-1. This method is applied to determine the industry pyrogallol with satisfactory result. Its average recovery rate is 101.0%. The electrochemical behavior of the system is studied at glassy carbon electrode by cyclic voltammetry. The electrode oxidation process of vanillin at glassy carbon electrode is irreversible with absorbtive characteristics .
出处
《绵阳师范学院学报》
2008年第2期60-63,共4页
Journal of Mianyang Teachers＇ College
关键词
焦性没食予酸
循环伏安法法
电化学行为
测定
pyrogallol
cyclic voltammetry
electrochemical behavior
determination
