NaIO_4-季胺新体系催化动力学光度法测定痕量锰及机理研究  

Kinetic-Spectrophotometric Determination of Trace Manganese by IO_4^--Tetrabase New System and the Mechanism

作　　者：李建国[1] 张敏[1] 赵康[1] 

机构地区：[1]苏州大学化学化工学院,江苏苏州215006

出　　处：《光谱学与光谱分析》2004年第7期870-872,共3页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金 (2 0 2 750 2 5);苏州大学青年科研基金 (Q31 0 92 0 1 )资助项目

摘　　要：基于pH 5 0的HAc NaAc缓冲介质中 ,Mn(Ⅱ )对IO-4氧化季胺显色的反应具有强烈的催化作用 ,建立了测定超痕量Mn的新方法。此法简便快速 ,选择性好 ,灵敏度极高 ,且无需加热。测定Mn(Ⅱ )的线性范围为 0～ 4 μg·L- 1 ,检出限为 4 6× 10 - 1 1 g·mL- 1 ,用于井水、矿泉水等水样中Mn的测定 ,结果满意。对反应的机理也进行了深入探讨。A new kinetic-spectrophotometric method for the determination of trace amounts of manganese(Ⅱ) has been proposed. The method is based on the manganese(Ⅱ) catalyzing the coloring reaction of tetrabase[4,4'-bis(dimethylamino)-diphenylmethane] oxidized by sodium periodate in HAc-NaAc(pH≈5.0) medium. The linear range of the determination of manganese is 0-4 μg·L -1, and the detection limit is 4.6×10 -11 g·mL -1. The method is not only simple, rapid and with good sensitivity but also without heating. It has been used for the determination of trace amounts of manganese in water sample with satisfactory results. The mechanism of the reaction is discussed in detail.

关 键 词：碘酸钠 季胺 催化动力学光度法 痕量分析 锰 

分 类 号：O614.711[理学—无机化学] O657.3[理学—化学]