摘要
本文籍在pH为3.5的HOAc-NaOAc缓冲溶液中.Mn(Ⅱ)对IO_4^-氧化固绿的催化作用,以氨三乙酸做活化剂、氟化钠作掩蔽剂,用抗坏血酸中止反应。示波极谱法测量催化反应过程中固绿浓度变化,以间接测定锰。建立了一个检测限和测定范围分别为3.8ng,/L和7.6～2000ng/L锰的催化反应-示波极谱分析新方法。该法已用于茶叶中微量元素锰的测定。
A new, rapid, highly sensitive and selective catalytic method with oscillopolarographic detection for the determination of ultra trace amounts of manganese is described,based on the Mn(Ⅱ) Catalysed slow oxidation of fast green with IO_4^- in pH3.5 acetate buffer solution in the presence of nitrilotriacetic acid as activator and NaF as masking agent. Ascorbic acid was chosen as the quenching reagent for the reaction, fast green was selected as the monitoring component which exhibits a sensitive osciltopolarographic wave at—0.58V (vs. SCE). A linear calibration graph from 7.6 to 2000ng/L Mn was obtained by the fixed time procedure. Mn in tea samples was analysed by this method with satisfactory results.
出处
《分析试验室》
CAS
CSCD
北大核心
1992年第5期4-6,共3页
Chinese Journal of Analysis Laboratory
关键词
催化反应
示波极谱法
锰
Catalytic reaction
oscillopolarographic method
manganese determination
