基于碘化钾显色反应测定水质高锰酸盐指数

引用本文: 李必冬, 叶紫淇, 黄才宝, 周凤谊, 容玉瑶, 刘长宇, 李玉瑛, 徐晓龙, 郏建波, 刘敏超. 基于碘化钾显色反应测定水质高锰酸盐指数[J]. 分析化学, 2021, 49(6): 1044-1052. doi: 10.19756/j.issn.0253-3820.211221 shu

Citation: LI Bi-Dong, YE Zi-Qi, HUANG Cai-Bao, ZHOU Feng-Yi, RONG Yu-Yao, LIU Chang-Yu, LI Yu-Ying, XU Xiao-Long, JIA Jian-Bo, LIU Min-Chao. Permanganate Index Measuring Method Based on Chromogenic Reaction of Potassium Iodide[J]. Chinese Journal of Analytical Chemistry, 2021, 49(6): 1044-1052. doi: 10.19756/j.issn.0253-3820.211221 shu

基于碘化钾显色反应测定水质高锰酸盐指数

李必冬 ^1, ,
叶紫淇 ^1, ,
黄才宝 ^1, ,
周凤谊 ^2, ,
容玉瑶 ^3, ,
刘长宇 ^{1,
,} ,
李玉瑛 ^1, ,
徐晓龙 ^1, ,
郏建波 ^1, ,
刘敏超 ^{1,
,}

1.
五邑大学生物科技与大健康学院, 江门 529020;
2.
江门市农业环境监测站, 江门 529000;
3.
江门市农产品质量监督检验测试中心, 江门 529200

通讯作者: 刘长宇,E-mail:wyuchemcyliu@126.com; 刘敏超,E-mail:wyuchemlmc@126.com

基金项目:
国家自然科学基金项目（No.21974097）、广东省普通高校重点实验室项目（No.2020KSYS004）、广东省普通高校重点领域专项（No.2020ZDZX2015）和江门市科技局项目（No.2020030102730008711）资助。

摘要: 高锰酸盐指数（COD_Mn）是评价地表水有机物污染程度的重要指标之一。本研究以KMnO₄处理水样，以碘化钾还原处理后水样中剩余的KMnO₄，建立了一种简单、快速、低消耗的水质COD_Mn测定方法。在反应温度为105℃、消解时间为20 min、KMnO₄溶液浓度为0.0040 mol/L、H₂SO₄溶液浓度为1∶4（V/V）的条件下，产物I₃^-溶液吸光度与COD_Mn有良好的线性关系，方法检出限为0.2 mg/L，测定下限为0.5 mg/L，测定上限高达9.0 mg/L。在实际水样测试中，加标回收率在100.0%~108.0%之间。与国标方法相比，扩大了检测范围，简化了反应过程，实现了批量测量，具有良好的重现性和稳定性，适合发展为在线监测方法。

关键词:

English

Permanganate Index Measuring Method Based on Chromogenic Reaction of Potassium Iodide

1.
School of Biotechnology and Health Sciences, Wuyi University, Jiangmen 529020, China;
2.
Jiangmen Agricultural Environment Monitoring Station, Jiangmen 529000, China;
3.
Jiangmen Agricultural Product Quality Supervision Inspection and Test Center, Jiangmen 529200, China

Corresponding author: LIU Chang-Yu, ; LIU Min-Chao,

Received Date: 18 March 2021
Revised Date: 30 April 2021
Fund Project:
Supported by the National Natural Science Foundation of China (No..21974097), the Key Laboratory Project of Guangdong Regular Higher Education Institutions (No.2020KSYS004), the Major Project of Guangdong Regular Higher Education Institutions (No.2020ZDZX2015) and the Jiangmen Municipal Science and Technology Bureau (No.2020030102730008711).

Abstract: Permanganate index (COD_Mn) is one of the important indicators in evaluating the pollution level of ground water. In this study, KMnO₄ was used to treat water samples and the residual KMnO₄ in water samples was treated by KI. On the basis of this, a simple, fast and low consumption method for determination of COD_Mn was established by way of chromogenic reaction. Under the optimum experiment conditions such as reaction temperature at 105 ℃, digestion for 20 min, 0.0040 mol/L KMnO₄, and H₂SO₄ solution (1∶4, V/V), there was a good linear relationship between the absorbance of I₃^- solution and the concentration of COD_Mn. The detection limit ranged from 0.5 to 9.0 mg/L and the limit of detection was 0.2 mg/L. In the real water samples test, the adding standard recovery ranged from 100.0% to 108.0%. Compared with the national standard method, this method expanded the range of detection, simplified the reaction process, and admitted batch measurement. This method confirmed a good reproducibility, and was suitable for developing online monitoring method.

Key words:

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基于碘化钾显色反应测定水质高锰酸盐指数

通讯作者: 刘长宇,E-mail:wyuchemcyliu@126.com; 刘敏超,E-mail:wyuchemlmc@126.com

English

Permanganate Index Measuring Method Based on Chromogenic Reaction of Potassium Iodide

Corresponding author: LIU Chang-Yu, ; LIU Min-Chao,

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

基于碘化钾显色反应测定水质高锰酸盐指数

通讯作者: 刘长宇,E-mail:wyuchemcyliu@126.com; 刘敏超,E-mail:wyuchemlmc@126.com

English

Permanganate Index Measuring Method Based on Chromogenic Reaction of Potassium Iodide

Corresponding author: LIU Chang-Yu, ; LIU Min-Chao,

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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