Phenoxazine as a solid monitoring reagent for ozone

Removal of atmospheric oxidants with annular denuders

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Annular denuders have been tested for their ability to remove atmospheric photochemical oxidants including ozone (150-170 ppb), nitrogen dioxide ppb), nitric acid (35 ppb), and peroxyacetyl nitrate (PAN,(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24)(25).Formaldehyde (80-140 ppb) was also tested as a copollutant. Tests were carried out at flow rates of 1, 2, and 20 L/min, with oxidants tested singly or as part of photochemical mixtures in purified air.

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“…Annular denuders have been tested for their ability to remove atmospheric photochemical oxidants including ozone (150-170 ppb), nitrogen dioxide ppb), nitric acid (35 ppb), and peroxyacetyl nitrate (PAN,(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24)(25).…”

Measurement of Ozone Concentrations in Ambient Air Using a Badge-Type Passive Monitor

“…Substituted olefins such as 1,2-di-(4-pyridyl)-ethylene 3 and 1,1-diphenylethylene 4 react with ozone to form aldehydes which can then be determined spectrophotometrically; however, Blehm et al 5 found that the aldehydes formed by ozonization were unstable and could be lost by vaporization, and oxygen was found to enhance these reactions. Organic colorants such as phenoxazine 6 and 10,10'-dimethyl-9,9'-biacrydylidene 7 react with ozone to produce color changes which can be quantified by absorbance measurements. However, sunlight and nitrogen dioxide were found to interfere with these color change reactions.…”

3-Methyl-2-benzothiazolinone acetone azine with 2-phenylphenol as a solid passive monitoring reagent for ozone

“…In a continuing study of solid reagents for ozone, tin-(Il)-diphenylcarbazide was the first reported as a visual colorimetric reagent responsive to both ozone and nitrogen dioxide (1,2), which are the strong oxidants of concern as atmospheric pollutants. Phenoxazine was reported as a solid reagent selective for ozone (3). It produced a dull brown color with ozone, but it also produced a visually distinct red-orange color with nitrogen dioxide.…”

“…Organophosphorus compounds containing the thiophosphoryl (P=S) bond, including demeton, diazinon, malathion, parathion, and phorate, are widely used insecticides in agricultural operations (I). Laboratory and ambient air data have shown that for parathion and certain other organophosphorus compounds containing the thiophosphoryl bond, reaction occurs rapidly under atmospheric or simulated atmospheric conditions to transform the thiophosphoryl bond into a phosphoryl (P=0) bond (2)(3)(4)(5). Furthermore, the available evidence (2) suggests that this conversion of parathion [p-02NC6H40P(S)-(OC2H6)2] to paraoxon [p-02NC6H40P(0)(0C2H5)2] after application of parathion occurs in the vapor phase.…”