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

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).

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.
- Water quality,
- Permanganate index,
- Potassium iodide,
- Spectrophotometry
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沈阳化工大学材料科学与工程学院沈阳 110142