Abstract
A method for the continuous delivery of nitrogen dioxide gas to environmental exposure chambers has foeem developed utilizing silicone fluid (DC 200 fluid) as a carrier for the gas and a drop-rate measurement for the metering and monitoring of rate of delivery. An approximately linear relationship was found between drop rate and NO2 concentration as determined with fritted-bubbler samples and meter recordings, With a 4-liter reservoir, little change in drop rate was noted over a 48-hour period, and simple adjustments In height of the reservoir permitted accurate maintenance of the gas concentration in the chamber. The method is particularly advantageous for the continuous delivery of NO2 gas at levels Sess than 5 ppm and has the important attributes of reliability, simplicity of operation, ease of monitoring, and relative safety.
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