Micro-particles as interfering substances in colorimetric residual chlorine measurement

Conventional methods using o-tolidine and N,N-diethyl-p-phenylenediamine as colorimetric reagents have been extensively applied worldwide in residual chlorine measurement for water quality and environmental management. Different types of interferences resulting in erroneous measurements while using...

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Bibliographic Details
Published in:Ecotoxicology and environmental safety 2021-01, Vol.207, p.111279, Article 111279
Main Authors: Li, Peng, Furuta, Takeshi, Kobayashi, Takuya
Format: Article
Language:English
Subjects:
Benzidines
Chlorides
Chlorination
Chlorine - chemistry
Colorimetry
Colorimetry - methods
Interference
Micro-particle
Microalgae
Nitro Compounds
Phenylenediamines
Residual chlorine
Water Purification - methods
Water treatment
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Summary:Conventional methods using o-tolidine and N,N-diethyl-p-phenylenediamine as colorimetric reagents have been extensively applied worldwide in residual chlorine measurement for water quality and environmental management. Different types of interferences resulting in erroneous measurements while using colorimetry have been previously reported. In this study, we experimentally demonstrated micro-particles as interfering substances in selected inorganic (five metal oxidants) and organic (microalgae) particles. The results indicated erroneous measurements (viz. colour development) for three of the selected particles. These erroneous measurement levels were evaluated with reference to the chlorine concentration (in mg-Cl2/L, hereafter represented as mg/L) in relation to both representative colorimetric reagents in terms of the amount of particles and time variations. A novel viewpoint that filtration could be a possible solution to the erroneous measurement caused by such micro-particles was proposed. •Micro-particles classified as interfering substances in residual chlorine measurement.•Erroneous measurement caused by selected inorganic particles was investigated.•Characteristics of erroneous measurement caused by an organic bio-particle were investigated.•Filtration proposed as a solution to erroneous measurement caused by micro-particles.
ISSN:0147-6513
1090-2414
DOI:10.1016/j.ecoenv.2020.111279