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Measuring the Epoxy Content of Aerosols Using Ion Chromatography
COLORADO STATE UNIV FORT COLLINS
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This study was designed to determine if ion chromatography was an adequate analytical tool for measuring the concentration of reactive epoxy resins in ambient air as well as to determine standard stability of the method for use in field industrial hygiene operations. Stoichiometric reaction of bromide generated in situ with spiked standards of a 89.4 percent pure and 93.8 percent pure model compound, diglycidyl ether of bisphenol A DGBA, were analyzed using ion chromatography to determine recovery rates of the model compound. Recovery rates for five different loading levels were compared to guidelines set forth by the National Institute for Occupational Health and Safety NIOSH in order to assess the outcome of this method. Standards were analyzed six times over a 30 day period in order to determine standard stability. Mean recovery rates for both of the DGBA products met the NIOSH guidelines for the highest two loading levels, but not the lower three loading levels. Coefficients of variation were also high for the lower three loading levels, much greater than 10, and were generally much less than 10 for the two highest loading levels. The results suggested carryover, contamination from one standard to another, as the cause of the poor recovery rates as well as the large variations in the data. Eliminating the carryover should significantly improve the results.
APPROVED FOR PUBLIC RELEASE