LUOYe,LIANG Zhong-xuan,LIUHan-lin.Improvement of DPD Spectrophotometric Method for Determination of Free Chlorine and Total Chlorine in Water[J].China Water & Wastewater,2022,38(18):129-133.
Improvement of DPD Spectrophotometric Method for Determination of Free Chlorine and Total Chlorine in Water
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第18期
Page:
129-133
Column:
Date of publication:
2022-09-17
- Keywords:
- free chlorine; total chlorine; N; N-diethyl-1; 4-phenylenediamine(DPD); calibration curve; standard solution
- Abstract:
- Calibration curve of DPD spectrophotometry is difficult to meet the requirements in the determination of low concentration free chlorine and total chlorine in water samples. To solve this problem, a potassium permanganate and potassium iodide standard solution system was established, and the feasibility of replacing the potassium iodate and potassium iodide standard solution system in standard method was investigated. The potassium permanganate and potassium iodide standard solution system effectively solved the problem of low color at low concentration points, and the method was simpler and faster than the original standard method. The method detection limit was 0.003 mg/L, which can meet the requirements for the determination of low concentration free chlorine and total chlorine in water samples (such as surface water).
Last Update:
2022-09-17