Review and Statistical Analysis of Stack Sampling Procedures for the Sulfur and Nitrogen Oxides in Fossil Fuel Combustion
- 4 June 1972
- journal article
- research article
- Published by Taylor & Francis in Aihaj Journal
- Vol. 33 (6) , 397-405
- https://doi.org/10.1080/0002889728506671
Abstract
A brief review is given of the state of the art in “manual” chemical methods for stack sampling and analysis for the oxides of sulfur and nitrogen. The precision and accuracy of analytical procedures and of sampling and collection methods are compared. These results are based on a statistical analysis of the sparse published field data as well as on a significant number of heretofore unpublished power plant measurements. The observed precision (coefficient of variation) in field measurement of sulfur trioxide by absorption in 80% isopropanol is ±10 to 20% at 15 ppm. The controlled condensation method provides considerable improvement; precision of ±4% has been obtained for field sampling at 12 ppm SO3. Collection of sulfur dioxide in hydrogen peroxide, followed by analysis specific for sulfate, provides the best precision; better than ±3% can be attained at SO2 concentrations of ∼1000 ppm. Regression analysis of field data for determination of NOx by the phenol disulfonic acid method suggests that precisions of ±3% and 19% are achieved at 1000 ppm and 100 ppm, respectively, for coal-fired power plants.Keywords
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