Letter to the editor on "ion chromatographic measurement of fluoride and sulfur dioxide in samples collected at aluminum smelters."
Am Ind Hyg Assoc J 1992 Jan; 53(1):A-14
Comments were made in reference to "Ion Chromatographic Measurement of Fluoride and Sulfur Dioxide in Samples Collected at Aluminum Smelters" by D. R. Balya (American Industrial Hygiene Association Journal, August 1991). The paper concerned a fluoride (16984488) analysis procedure for aluminum smelters. One cited problem was the use of an untreated cellulose pad as backup for the cellulose ester membrane front filter. Findings indicated a 16 to 35 microgram loss of fluoride by reaction with the cellulose pads at loadings of 32 and 204 micrograms. Concern was expressed over acetate interference from the cellulose ester membrane filter in the fluoride fusion step as well as the need to ensure adequate dilution to avoid a high carbonate background. Rebuttal by the original author focused on consistent recoveries of over 90% and reduction of excess carbonate through use of the AS4A column, dilution by 150, and use restriction to full shift samples.
NIOSH-Author; Chemical-analysis; Analytical-methods; Analytical-chemistry; Chromatographic-analysis; Smelting; Primary-smelting; Metalworking-industry
American Industrial Hygiene Association Journal