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Environ Sci Technol

Title:		Ozone removal in the sampling of parts per billion levels of terpenoid compounds: an evaluation of different scrubber materials
Author(s):		Fick J; Pommer L; Andersson B; Nilsson C;
Address:		"Department of Chemistry, Environmental Chemistry, Umea University, Sweden"
Journal Title:		Environ Sci Technol
Year:		2001
Volume:		35
Issue:		7
Page Number:		1458 - 1462
DOI:		10.1021/es0001456
ISSN/ISBN:		0013-936X (Print) 0013-936X (Linking)
Abstract:		"Some reactive volatile organic compounds (VOCs) are prone to degradation during sampling in an ozone-rich environment. A wide variety of different chemicals have been used to remove the ozone prior to sampling, but the possibility of interference by such chemicals with the sampled VOCs has not been thoroughly examined. In the present investigation, the retention/degradation of four terpenes (alpha-pinene, beta-pinene, 3-carene, and limonene) and isoprene together with some of their oxidation products (alpha-pinene oxide, nopinone, 4-acetyl-1-methylcyclohexene (AMCH), methylglyoxal, and methacrolein) has been studied, using various ozone-removing chemicals in an attempt to evaluate their potential as ozone scrubbers in the sampling of ambient air. The chemicals included in this first screening and their ozone-removing capacity are as follows: KI, MnO2, and Na2SO3 removed ozone for more than 24 h when exposed to 73-78 ppb (150-160 microg/m3) at a sampling flow rate of 500 mL/min. Silanized poly(1,4-phenylene sulfide) (PFS) removed ozone for 5 h, unsilanized PFS removed ozone for 1 h and 50 min, and Na2S2O3 removed ozone for 20 min. The recovery of the selected compounds with the different scrubbers was >95% for all compounds for KI; >95% for the terpenes oxidation products; >90% for the terpenes and isoprene for PFS; >90% for the terpenes and isoprene for MnO2 on copper nets, Na2SO3, and Na2S2O3; and <90% for the terpenes and isoprene for carulite (a commercial mixture between MnO2, CuO, and Al2O3), CuO, and indigo carmine"
Keywords:		"Air Pollutants/*analysis Air Pollution/*prevention & control Organic Chemicals/analysis Oxidants, Photochemical/*chemistry Oxidation-Reduction Ozone/*chemistry Specimen Handling Terpenes/*analysis/chemistry Volatilization;"
Notes:		"MedlineFick, J Pommer, L Andersson, B Nilsson, C eng Research Support, Non-U.S. Gov't 2001/05/12 Environ Sci Technol. 2001 Apr 1; 35(7):1458-62. doi: 10.1021/es0001456"