FTIR transmission spectrometry for the nondestructive determination of ammonium and sulfate in ambient aerosols collected on teflon filters

Collection of ambient particulate matter by porous vegetation barriers: Sampling and characterization methods

“…The methods used to remove the influence of the extracting solvent and the field background impurities from the sample spectra appear to be introducing difficulties (sample peak distortion, creation of negative absorbances) in interpreting upwind-downwind differences and confounded attempts made to derive meaningful functional group concentrations from the spectra. To quantitatively characterize the effects of hedges on functional group composition, an FTIR analysis method more suitable for quantitation (Krost & McClenny, 1994;McClenny, Childers, Rohl, & Palmer, 1985;Reff et al, 2007) should be applied to a large number of paired upwind-downwind samples to robustly characterize how hedges affect concentrations of individual functional groups. The larger number of samples will also aid in accounting for instrumental anomalies in the spectroscopic analysis.…”

Fourier Transform Infrared Spectroscopy of Aerosol Collected in a Low Pressure Impactor (LPI/FTIR): Method Development and Field Calibration

“…Calibration experiments established that the samples could be stored for approximately 3 days before any significant degradation of the resulting spectra occurred. Previous investigators (McClenny et al, 1985), found &3% reproducibility of sulfate absorption areas for filter samples that had been desiccated for 24 hours.…”

FTIR measurements of functional groups and organic mass in aerosol samples over the Caribbean

“…Linear relationships between mass and infrared absorbance for ammonium and sulfate on Teflon filters have been reported previously by McClenny et al (1985). This technique quantifies moles of bonds from absorbance, using the measured absorption per mole of each component from laboratory-generated standards.…”