FTIR transmission spectroscopy for quantitation of ammonium bisulfate in fine particulate matter collected on Teflon filters
Conference
·
OSTI ID:197421
- Environmental Protection Agency, Research Triangle Park, NC (United States). Atmospheric Research and Exposure Assessment Laboratory
A quantitative measurement method for fine particle bisulfate in ammonium bisulfate collected from the ambient air onto Teflon filters is described. Infrared absorbance measurements of the Teflon filters are made before and after particle collection. Subtraction of the two spectra reveals the absorbance spectrum for the particulate. The presence of bisulfate is identified by characteristic and unique spectral features including prominent absorption bands at 1,050 cm{sup {minus}1} and 870 cm{sup {minus}1}. The area seen under the absorption band centered at 870 cm{sup {minus}1} is calibrated for the bisulfate ion by measuring the hydrogen ion concentration for a series of ammonium bisulfate calibration standards. An indirect measurement of the bisulfate ion is made by inference from measurement of the sulfate ion concentration as determined by ion chromatography. The lower limit of detection (LLD) for the bisulfate ion is 150 nanomoles. This corresponds to the total ammonium bisulfate which would be collected from an air volume containing 1.2 micrograms/m3 sampled for 24 hours at 10.0 L/min. This method provides a specific, nondestructive, direct measurement of ammonium bisulfate. As such, the method has distinct advantages over indirect methods involving ion balance in solution.
- OSTI ID:
- 197421
- Report Number(s):
- CONF-9405167--
- Country of Publication:
- United States
- Language:
- English
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