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FT-IR TRANSMISSION SPECTROSCOPY FOR QUANTITATION OF AMMONIUM BISULFATE IN FINE PARTICULATE MATTER COLLECTED ON TEFLON FILTERS
Citation:
Krost, K. AND W. McClenny. FT-IR TRANSMISSION SPECTROSCOPY FOR QUANTITATION OF AMMONIUM BISULFATE IN FINE PARTICULATE MATTER COLLECTED ON TEFLON FILTERS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-94/358 (NTIS PB94209640).
Description:
A quantitative measurement method for fine particle bisulfatein ammonium bisulfate collected from the ambient air onto Teflon filters is described. nfrared absorbance measurements of the Teflon filters are made before and after particle collection. ubtraction of the two spectra reveals the absorbance spectrum of the particles. he presence of bisulfate is identified by characteristic and unique spectral features including prominent absorption bands at 1050 cm-1 and 870 cm-1. he integrated band absorbance at 870 cm-1 is used for quantitation. et chemical measurements of sulfate and hydrogen in synthetically-generated ammonium bisulfate standards are used in calibration. he lower limit of detection for the bisulfate ion is 150 nanomoles. his corresponds to the ammonium bisulfate which would be collected from an air volume containing 1.2 micrograms/m3 samples for 24 hours at 10. 0 L/min. his method provides a specific, nondestructive, direct measurement of ammonium bisulfate. s such, the method has distinct advantages over indirect methods involving ion balance in solution.