An analytical procedure for the determination of watersoluble fluoride in air and stack gas samples using a specific-ion electrode is described. Gaseous and particulate fluoride in ambient air are collected by filtration and chemisorption on membrane filters impregnated with sodium formate. Data pertaining to the collection efficiency and the dissolution of collected fluorides from ambient air samples are presented. As little as 0.25 part per billion fluoride in air can be measured with this procedure. Gaseous fluorides in stack gas are collected by reaction with a hot glass probe to form gaseous silicon tetrafluoride, which hydrolyzes in water to form soluble fluosilicic acid. Results obtained with the electrode and the Spadns-Zirconium Lake Method for fluoride in stack gas were compared, and at the 0.05 significance level, no difference existed in the two methods. This relatively new analytical tool, as applied to the analysis of air pollutants, has been shown to be rapid and convenient, and appears to be less susceptible to interferences than other methods presently available for the measurement of fluoride.

No abstract

No abstract

JAPCAPublication details, including instructions for authors and subscription information:

No abstract