Identifying the chloroperoxyl radical in acidified sodium chlorite solution.

The present study identified the active radical species in acidic sodium chlorite and investigated the feasibility of quantifying these species with the diethylphenylenediamine (DPD) method. Electron spin resonance (ESR) spectroscopy was used to identify the active species generated in solutions con...

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Autores principales:	Hiroyuki Kawata, Masahiro Kohno, Kohei Nukina, Isanori Horiuchi, Hisataka Goda, Tomomi Kuwahara, Kosei Yoshimori, Akimitsu Miyaji, Toshiaki Kamachi, Toshikazu Yoshikawa
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/47960156cd564a6eab723cfec04dc789
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spelling	oai:doaj.org-article:47960156cd564a6eab723cfec04dc7892021-12-02T20:05:31ZIdentifying the chloroperoxyl radical in acidified sodium chlorite solution.1932-620310.1371/journal.pone.0252079https://doaj.org/article/47960156cd564a6eab723cfec04dc7892021-01-01T00:00:00Zhttps://doi.org/10.1371/journal.pone.0252079https://doaj.org/toc/1932-6203The present study identified the active radical species in acidic sodium chlorite and investigated the feasibility of quantifying these species with the diethylphenylenediamine (DPD) method. Electron spin resonance (ESR) spectroscopy was used to identify the active species generated in solutions containing sodium chlorite (NaClO2). The ESR signal was directly observed in an acidified sodium chlorite (ASC) aqueous solution at room temperature. This ESR signal was very long-lived, indicating that the radical was thermodynamically stable. The ESR parameters of this signal did not coincide with previously reported values of the chlorine radical (Cl●) or chlorine dioxide radical (O = Cl●-O and O = Cl-O●). We refer to this signal as being from the chloroperoxyl radical (Cl-O-O●). Quantum chemical calculations revealed that the optimal structure of the chloroperoxyl radical is much more thermodynamically stable than that of the chlorine dioxide radical. The UV-visible spectrum of the chloroperoxyl radical showed maximum absorbance at 354 nm. This absorbance had a linear relationship with the chloroperoxyl radical ESR signal intensity. Quantifying the free chlorine concentration by the DPD method also revealed a linear relationship with the maximum absorbance at 354 nm, which in turn showed a linear relationship with the chloroperoxyl radical ESR signal intensity. These linear relationships suggest that the DPD method can quantify chloroperoxyl radicals, which this study considers to be the active species in ASC aqueous solution.Hiroyuki KawataMasahiro KohnoKohei NukinaIsanori HoriuchiHisataka GodaTomomi KuwaharaKosei YoshimoriAkimitsu MiyajiToshiaki KamachiToshikazu YoshikawaPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 16, Iss 5, p e0252079 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Hiroyuki Kawata Masahiro Kohno Kohei Nukina Isanori Horiuchi Hisataka Goda Tomomi Kuwahara Kosei Yoshimori Akimitsu Miyaji Toshiaki Kamachi Toshikazu Yoshikawa Identifying the chloroperoxyl radical in acidified sodium chlorite solution.
description	The present study identified the active radical species in acidic sodium chlorite and investigated the feasibility of quantifying these species with the diethylphenylenediamine (DPD) method. Electron spin resonance (ESR) spectroscopy was used to identify the active species generated in solutions containing sodium chlorite (NaClO2). The ESR signal was directly observed in an acidified sodium chlorite (ASC) aqueous solution at room temperature. This ESR signal was very long-lived, indicating that the radical was thermodynamically stable. The ESR parameters of this signal did not coincide with previously reported values of the chlorine radical (Cl●) or chlorine dioxide radical (O = Cl●-O and O = Cl-O●). We refer to this signal as being from the chloroperoxyl radical (Cl-O-O●). Quantum chemical calculations revealed that the optimal structure of the chloroperoxyl radical is much more thermodynamically stable than that of the chlorine dioxide radical. The UV-visible spectrum of the chloroperoxyl radical showed maximum absorbance at 354 nm. This absorbance had a linear relationship with the chloroperoxyl radical ESR signal intensity. Quantifying the free chlorine concentration by the DPD method also revealed a linear relationship with the maximum absorbance at 354 nm, which in turn showed a linear relationship with the chloroperoxyl radical ESR signal intensity. These linear relationships suggest that the DPD method can quantify chloroperoxyl radicals, which this study considers to be the active species in ASC aqueous solution.
format	article
author	Hiroyuki Kawata Masahiro Kohno Kohei Nukina Isanori Horiuchi Hisataka Goda Tomomi Kuwahara Kosei Yoshimori Akimitsu Miyaji Toshiaki Kamachi Toshikazu Yoshikawa
author_facet	Hiroyuki Kawata Masahiro Kohno Kohei Nukina Isanori Horiuchi Hisataka Goda Tomomi Kuwahara Kosei Yoshimori Akimitsu Miyaji Toshiaki Kamachi Toshikazu Yoshikawa
author_sort	Hiroyuki Kawata
title	Identifying the chloroperoxyl radical in acidified sodium chlorite solution.
title_short	Identifying the chloroperoxyl radical in acidified sodium chlorite solution.
title_full	Identifying the chloroperoxyl radical in acidified sodium chlorite solution.
title_fullStr	Identifying the chloroperoxyl radical in acidified sodium chlorite solution.
title_full_unstemmed	Identifying the chloroperoxyl radical in acidified sodium chlorite solution.
title_sort	identifying the chloroperoxyl radical in acidified sodium chlorite solution.
publisher	Public Library of Science (PLoS)
publishDate	2021
url	https://doaj.org/article/47960156cd564a6eab723cfec04dc789
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Identifying the chloroperoxyl radical in acidified sodium chlorite solution.

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