1. Sunlight caused interference in outdoor N, N-diethyl-p-phenylenediamine colorimetric measurement for residual chlorine and the solution for on-site work.
- Author
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Li P, Yoshimura T, Furuta T, Yanagawa T, Shiozaki K, and Kobayashi T
- Subjects
- Chlorine radiation effects, Colorimetry instrumentation, Colorimetry standards, Disinfectants radiation effects, Disinfection methods, Halogenation, Phenylenediamines radiation effects, Chlorine analysis, Colorimetry methods, Disinfectants analysis, Phenylenediamines analysis, Sunlight, Ultraviolet Rays
- Abstract
Chlorination is the most common method to control water qualities, in some case on-site outdoor measurements are required to measure easily-decaying residual chlorine concentration appropriately without delay. In this study sunlight-induced unexpected colour development (UCD) of N, N-diethyl-p-phenylenediamine (DPD) colorimetric measurement was studied under several sun exposure conditions. The colour development level was evaluated with reference to chlorine concentration (mg/L) and relationships between colour development rate (mg/L min) and intensities of solar were investigated. UCD was found to be related to both exposure intensity and time. By means of exposure experiment under specific wavelength of ultraviolet (UV), it was confirmed that both middle and short wavelength of UV radiation being responsible for such an unexpected measurement. Consequently, a simple device was designed using three commercially available anti-UV films, one of which could effectively prevent the UCD from direct sun exposure., (Copyright © 2018 Elsevier Inc. All rights reserved.)
- Published
- 2019
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