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Specificity of detection methods of nitrites and ozone in aqueous solutions activated by air plasma
Author(s) -
Tarabová Barbora,
Lukeš Petr,
Janda Mário,
Hensel Karol,
Šikurová Libuša,
Machala Zdenko
Publication year - 2018
Publication title -
plasma processes and polymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 74
eISSN - 1612-8869
pISSN - 1612-8850
DOI - 10.1002/ppap.201800030
Subject(s) - chemistry , ozone , hydrogen peroxide , peroxynitrite , aqueous solution , analytical chemistry (journal) , dielectric barrier discharge , nitrogen , chromatography , environmental chemistry , organic chemistry , electrode , enzyme , superoxide
Air transient spark (TS) discharge generates cold plasma, which is a rich source of reactive oxygen and nitrogen species (RONS). The gaseous products both in ambient air and air humidified by water electrospray (ES) are nitrogen oxides (NO and NO 2 ). The rotational and vibrational temperatures determined by optical emission spectroscopy (OES) are lower with water ES through the discharge than in ambient air, which reduces the formation of NO x . The investigation of the specificity of Griess colorimetric assay for the detection of long‐lived nitrites in plasma activated solutions confirms its accuracy by comparison with ion chromatography (IC) and excludes possible interferences with hydrogen peroxide by using the enzyme catalase. Examination of the specificity of the Indigo blue assay for ozone detection shows strong interferences with the peroxynitrite chemistry. Phenol as the chemical probe confirms that the TS air discharge produces no aqueous ozone.