电致化学发光法测定Mn<sup>2+</sup>含量的研究

引用本文: 嵇正平, 胡红果, 颜丙义, 朱广绪, 徐琴, 胡效亚. 电致化学发光法测定Mn²⁺含量的研究[J]. 分析化学, 2017, 45(3): 397-402. doi: 10.11895/j.issn.0253-3820.160784 shu

Citation: JI Zheng-Ping, HU Hong-Guo, YAN Bing-Yi, ZHU Guang-Xu, XU Qin, HU Xiao-Ya. An Electrochemiluminescence Method for Determination of Manganese (Ⅱ)[J]. Chinese Journal of Analytical Chemistry, 2017, 45(3): 397-402. doi: 10.11895/j.issn.0253-3820.160784 shu

电致化学发光法测定Mn²⁺含量的研究

扬州大学化学化工学院, 扬州 225002
基金项目:
本文系国家自然科学基金项目(Nos.21575124，21675140)和江苏省大学生实践创新训练计划(No.201511117059Y)资助

摘要: 在H₃PO₄溶液中，利用Ag⁺存在条件下，Mn²⁺可以被电化学氧化成KMnO₄，KMnO₄进而与酸性邻苯二酚或碱性鲁米诺等发生反应，得到较好的化学发光信号，构建了一种间接测定水溶液中Mn²⁺含量的方法。研究了Ag⁺对Mn²⁺电化学氧化的影响。Mn²⁺电化学氧化过程中，当Ag⁺浓度为1.5×10^-5 mol/L，H₃PO₄浓度为0.01 mol/L，电解2 min后，发光强度达到最大。探讨了不同pH条件下的化学发光强度与Mn²⁺浓度的关系及选择性。在酸性介质中，邻苯二酚的发光强度与Mn²⁺在1.82×10^-7-7.27×10^-5mol/L的浓度范围内呈现良好的线性关系；常见的金属离子等对Mn²⁺测定干扰小。将本方法用于地表水及饮用水中Mn²⁺的测定，与标准方法相比，结果令人满意。

关键词:

锰
/ 电化学氧化
/ 化学发光

English

An Electrochemiluminescence Method for Determination of Manganese (Ⅱ)

College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China
Received Date: 27 October 2016
Revised Date: 22 December 2016
Fund Project:
This work was supported by the National Natural Science Foundation of China (Nos. 21575124, 21675140)

Abstract: In the presence of silver ion, Mn²⁺ could be electro-oxidized to potassium hypermanganate in phosphoric acid solution, which could effectively react with pyrocatechol in acid solution and luminol in sodium hydroxide solution to produce chemiluminescence. On the basis of this, a novel indirect approach for the detection of Mn²⁺ was established. The effect of silver ions on the electrochemical oxidation of Mn²⁺ was studied. When 1.5×10^-5 mol/L Ag⁺ and 0.01 mol/L phosphoric acid solution were used in the process of electrochemical oxidation, the CL intensity could be up to the maximum value after the above solution was electrolyzed for 2 min. The relation of CL intensity and Mn²⁺ concentration in the solutions at different pH and the selectivity were also investigated. When the pyrocatechol was used as luminescent reagent in the acidic medium, the CL intensity was linearly to the Mn²⁺ concentration in the range of 1.82×10^-7-7.27×10^-5 mol/L with excellent selectivity. Common ions had little interferences in the determination of Mn²⁺. The method was successfully applied to the determination of Mn²⁺ in surface water and drinking water with satisfactory results.

Key words:

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电致化学发光法测定Mn²⁺含量的研究

English

An Electrochemiluminescence Method for Determination of Manganese (Ⅱ)

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电致化学发光法测定Mn2+含量的研究

English

An Electrochemiluminescence Method for Determination of Manganese (Ⅱ)

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