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EVALUATION OF THE FOURIER TRANSFORM INFRARED SPECTROMETER FOR PARTICLE-ASSOCIATED AMMONIUM SULFATE DETERMINATION
Citation:
Krost, K. EVALUATION OF THE FOURIER TRANSFORM INFRARED SPECTROMETER FOR PARTICLE-ASSOCIATED AMMONIUM SULFATE DETERMINATION. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/R-92/050 (NTIS PB92160084).
Description:
A commercial Fourier transform infrared (FTIR) spectrometer, modified for automated analysis of particulate-associated sulfate, was used to obtain transmission spectra samples of particulate matter collected from the ambient air onto Teflon filters. n evaluation of this instrumentation was undertaken to determine its applicability for measuring sulfate and the correlation of results with those of ion chromatography and x-ray fluorescence. article samples from six geographical areas were analyzed in this study. esults from different filter sets, using individual filter blanks, show values of the coefficient of determination of 0.90 or higher for any two techniques with one notable exception. his exception is due to displacement of sulfate absorption from the wavelength interval used for analysis, and apparently indicates the effect of co-collected compounds in chemically shifting the spectra. or the best analytical results, the spectrum of individual Teflon filters should be used for subtracting the contribution of Teflon absorption. rientation of the filter in the FTIR system must be maintained to avoid changes in the blank spectrum due to Teflon absorption. he detection limit is 1.2 ug/cm2 which corresponds to 0.4 ug/m3 sampled over 24 hours at 13.3 L/min for ammonium sulfate.