Abstract
A platinum-lead coated annular denuder has been tested with humid atmospheres laden with nitrobenzene Atmospheres in the range 20-99% relative humidity at 12.5°C laden with 16 μ g m -3 nitrobenzene were employed. Measurements of the nitrobenzene leaving the denuder were made by a gas chromatograph fitted with an electron capture detector Results demonstrate the dramatic effect of high relative humidity on the performance of the denuder. Above 47% relative humidity the denuder showed immediate breakthrough of nitrobenzene and a greatly reduced capacity compared with relative humidity of ⩽ 20% It is believed that the presence of multilayers of sorbed water on the metal surface is the reason for the reduced efficiency of the denuder.
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