【作者】 杨天宇；

【导师】 狄俊伟；

【作者基本信息】 苏州大学 ， 应用化学， 2003， 硕士

【摘要】 本文运用溶胶凝胶（sol-gel）化学修饰电极的方法，把茜素红S固定于玻碳电极表面，制成了化学修饰电极并用于金属离子的测定。考察了稀释度，添加剂，电极表面处理等影响成膜条件的主要因素，优化了化学修饰电极的性能；研究了茜素红S溶胶凝胶化学修饰电极的电化学行为及动力学特性：建立了利用茜素红S溶胶凝胶化学修饰电极测定铝含量的方法，线性范围为1.44×10^-7mol/L—1.44×10^-6mol／L，r为0.9973，并用于水样中铝的测定。 提出了一种基于铜离子增敏形成磷钼钨杂多酸-3，3’，5，5’-四甲基联苯胺电荷转移复合物测定痕量钼的方法。在铜离子的存在下，既保持了原方法简便，快速的特点，避免了钨对钼测定的严重干扰，同时还大大提高了测定的灵敏度，摩尔吸光系数（ε）达4.92×10^-5l mol^-1cm^-1。更多还原

【Abstract】 The chemically modified electrode which immobilized Alizarin Red S (ARS) on glassy canbon(GC) electrode using the Sol-Gel film and its application for the determination of metal ions was investigated. The influence factors on properties of sol-gel film, such as proportion of dilution, additive and pretreatment of the electrode, were studied and optimized. The electrochemical behavior of ARS-sol-gel modified electrode was similar to ARS in solution. The dynamics parameters of ARS on GC electrode were compared with that in solution. This ARS-sol-gel modified electrode was applied for determination of aluminum. The linear range of aluminum concentration was from 1.44 l0-7mol/L to 1.44 l0-6mol/L.A new high sensitive spectrophotometric determination of trace molybdenum was investigated. Copper(Ⅱ) ions greatly enhanced the sensitivity of the determination of molybdenum, which based on the color charge transfer complex of molybdotungstophosphate-3,3’,5,5’ -tetramethylbenzidine, in the presence of poly vinyl alcohol. Molar absorption coefficient ( ) was 4.92 105 1 mol-1 cm-1 . The improved method maintained the features of simplicity, rapidity and selectivity, especially eliminating the interference from tungsten.更多还原