Development of standard reference materials for air quality measurement
Abstract
The National Bureau of Standards is studying gaseous Standard Reference Materials for air pollution measurements. Preparation of such materials requires definition of the stability, homogeneity, and accuracy of the samples. This information is obtained by long term studies of the gas systems, by development of absolute methods of analysis, and by analysis of large numbers of samples prepared in bulk. The results of studies, extending over several years, of low concentration of carbon monoxide in nitrogen and nitric oxide in nitrogen are reported. Over one thousand samples of these materials have been analyzed and the stability with time and the within-batch homogeneity have been characterized. Accuracy is achieved by use of gravimetric standards and with dynamic dilution systems. The use of permeation tubes of sulfur dioxide and nitrogen dioxide is necessary in some situations because of the reactivity of the gases.
- Publication:
-
ISA Transactions
- Pub Date:
- 1975
- Bibcode:
- 1975ISAT...14..281H
- Keywords:
-
- Air Pollution;
- Air Quality;
- Gas Analysis;
- Pollution Monitoring;
- Standards;
- Carbon Monoxide;
- Dilution;
- Gas Mixtures;
- Nitrogen Compounds;
- Nitrogen Oxides;
- Sulfur Oxides;
- Instrumentation and Photography