Ozone analysis by chemiluminescence measurement
article
Ozone concentrations in ambient air can be determined by measuring light emitted by reaction with the chemiluminescent dye Rhodamine B. The stability of the light emission is increased by protecting the dye by another compound, which reacts with ozone more easily, i.e. gallic acid. The stability of the chemiluminescent surface is also increased by an intermittent sampling procedure. This is accomplished by means of a threeway valve allowing each minute the introduction of ozonized air for about 15 sec in the reaction chamber, followed by the introduction of ozone-free air for about 45 sec. In this way also a check on the stability of the "zero-point" of the detecting system is obtained. The method is highly selective. No interferences of NO2, Cl2, SO2, H2S, NH3, HCl, H2O2 and HF have been observed at concentrations up to 2 ppm. The sensitivity of the chemiluminescent surface is decreased by adsorbed moisture. The moisture problem can be eliminated by coating the surface with a hydrophobic compound and by controlling the relative humidity of the ozone-free air, introduced into the reaction chamber between the actual ozone measurements. © 1971 Springer-Verlag.
TNO Identifier
227224
ISSN
00161152
Source
Fresenius' Zeitschrift für Analytische Chemie, 256(3), pp. 177-182.
Publisher
Springer-Verlag
Pages
177-182
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