Collection and Analysis of Trace Formic and Acetic Acid Vapors in Air Using Aminopropyl-Modified Surfaces
✍ Scribed by B.J. Johnson; S.C. Huang; A. Wong; L. Yao
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 337 KB
- Volume
- 49
- Category
- Article
- ISSN
- 0026-265X
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✦ Synopsis
Quartz filter surfaces were modified with aminopropyltrialkoxysilanes and used to collect gas phase acids. The filters were chemically characterized by titrimetric, gravimetric, and chromatographic methods; on the basis of these experiments, filter preparation methods were optimized. Analytical procedures for formic and acetic acids were developed based on their displacement from a sampled surface by a strong acid eluant and subsequent analysis of the eluant by ion chromatography. Passive collection of the acids from air and elution of the acids from the filter were highly efficient; in active sampling, efficiency of collection for acetic acid was less consistent than for formic acid. Analytical results from samples taken in Las Vegas are reported; concentration levels are consistent with previously reported values. (\mathcal{O} 1994) Academic Press. Inc.