Quantification of Ammonium in Aerosols by Near-Infrared Photothermal Spectroscopy

Journal Article

The potential of near-infrared photothermal spectroscopy for the analysis of aerosols collected on filter membranes is demonstrated. Laboratory-generated aerosols consisting of ammonium sulfate and soot are collected on Teflon® filters by the use of a dichotomous sampler. The N-H overtone/combination band at 2110 nm is used to determine ammonium in these mixtures. The presence of soot is shown to have a deleterious effect on the detectability of ammonium. The extent of this limitation is examined with the employment of well-characterized samples. An empirical expression, based on Beer's law, is developed which relates the photothermal signal to the relative soot and ammonium sulfate loadings.

Full Text

Duke Authors

Cited Authors

  • Röhl, R; Childers, JW; Palmer, RA

Published Date

  • July 1985

Published In

Volume / Issue

  • 39 / 4

Start / End Page

  • 668 - 672

Published By

Electronic International Standard Serial Number (EISSN)

  • 1943-3530

International Standard Serial Number (ISSN)

  • 0003-7028

Digital Object Identifier (DOI)

  • 10.1366/0003702854250086


  • en