Technique for monitoring toxic VOCs in air: sorbent preconcentration, closed-cycle cooler cryofocusing, and GC/MS analysis
Article Abstract:
Volatile organic compounds (VOCs) are major pollutants of the environment. The Clean Air Act Amendments of 1990 (CAAA) was enacted to improve the methods for monitoring toxic VOCs in air. A new approach to determine the concentration of VOCs in air employs automated gas chromatographic systems. Multiadsorbent traps that provide continuous air sampling can collect and analyze both polar and nonpolar VOCs in air. Testing shows that the technology is applicable to 97 of the 189 hazardous organic compounds listed in CAAA.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1996
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Measurement of sub-ppbv concentrations of aldehydes in a forest atmosphere using a new HPLC technique
Article Abstract:
High performance liquid chromatography (HPLC) was used to sample aldehydes, presumably the products of atmospheric photochemistry, in a high altitude forest environment. HPLC with fluorescence detection, using dansylhydrazine as a reagent, allowed greater sensitivity to small concentrations than the derivatization reaction with 2,4-dinitrophenylhydrazine. Formaldehyde and acetaldehyde emissions from aspen, pine and willow trees were detected at sub-parts per billion by volume levels with HPLC.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1992
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Dynamic polluted atmosphere generator at low ppbv levels for validating VOC sampling methods
Article Abstract:
A reconstituted atmospheric volatile organic compound (VOC) generator was designed to improve the measurement of VOCs at low ppbv levels in ambient air. The equipment consists of the air flow system which produced the purified airstream, the contamination device where the VOCs are injected and an optical signal recovery assembly, which monitors the ppbv level.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1995
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