Comparison of reflectance and photoacoustic photometry for determination of elemental carbon in aerosols

Delumyea, R. Del; Mitchell, Dennis R.

doi:10.1021/ac00262a040

Cited by 10 publications

(1 citation statement)

References 29 publications

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“…Since that time several more serious methodological comparisons have been carried out (8)(9)(10). In addition, comparisons of the two techniques as applied to specific examples have been reported (11)(12)(13)(14)(15). Although very informative, comparisons reported to date have been somewhat indirect since the two types of spectra were usually collected under significantly different experimental conditions.…”

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confidence: 99%

Direct comparison of the capabilities of photoacoustic and diffuse reflectance spectroscopies in the ultraviolet, visible, and near-infrared regions

Childers¹,

Roehl²,

Palmer³

1986

Anal. Chem.

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A dlrect comparlson of the capabllitles of photoacoustlc (PA) and dkfuse reflectance (DR) spectroscoples In the ultraviolet, visible, and nearinfrared spectral regions was made by collecting both types of spectra under nearly Identical conditions. This comparison focused on the followlng aspects: (1) slgnal-to-nolse ratio and sensltlvlty; (2) spectral deflnltlon and those factors, such as saturation and partlcle 8/28, whlch affect spectral deflnltlon; and (3) sample preparation conslderatlons for both qualltatlve and quantltatlve analysls. I n terms of signal-to-noise ratlo and spectral deflnltlon the two techniques are vMuaHy lndlstlngulshable for weakly absorbing, finely dlvlded powders. DRS Is slightly more SenSnlve but has a lower saturatlon llmA than does PAS and Is more severely affected by changes In particle slze. For particles larger than 100 pm, DR spectra are distorted and spectral deflnltlon Is degraded. I n terms of sample Preparation, especially when only qualitative results are desired, PAS Is clearly superlor. For quantitative resuits both techniques requlre careful control of particle 8/28, packing density, and total absorption.

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