Ozone Removal in the Sampling of Parts per Billion Levels of Terpenoid Compounds: An Evaluation of Different Scrubber Materials
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- 作者：Jerker Fick ; Linda Pommer ; Barbro Andersson ; and Calle Nilsson
- 刊名：Environmental Science & Technology
- 出版年：2001
- 出版时间：April 1, 2001
- 年：2001
- 卷：35
- 期：7
- 页码：1458 - 1462
- 全文大小：58K
- 年卷期：v.35,no.7(April 1, 2001)
- ISSN：1520-5851
文摘
Some reactive volatile organic compounds (VOCs) areprone to degradation during sampling in an ozone-richenvironment. A wide variety of different chemicals havebeen used to remove the ozone prior to sampling, but thepossibility of interference by such chemicals with thesampled VOCs has not been thoroughly examined. In thepresent investigation, the retention/degradation of fourterpenes (
-pinene, 
-pinene, 3-carene, and limonene) andisoprene together with some of their oxidation products (-pinene oxide, nopinone, 4-acetyl-1-methylcyclohexene(AMCH), methylglyoxal, and methacrolein) has been studied,using various ozone-removing chemicals in an attemptto evaluate their potential as ozone scrubbers in the samplingof ambient air. The chemicals included in this firstscreening and their ozone-removing capacity are asfollows: KI, MnO2, and Na2SO3 removed ozone for morethan 24 h when exposed to 73-78 ppb (150-160 
g/m3) ata sampling flow rate of 500 mL/min. Silanized poly(1,4-phenylene sulfide) (PFS) removed ozone for 5 h, unsilanizedPFS removed ozone for 1 h and 50 min, and Na2S2O3removed ozone for 20 min. The recovery of the selectedcompounds with the different scrubbers was >95% for allcompounds for KI; >95% for the terpenes oxidationproducts; >90% for the terpenes and isoprene for PFS;>90% for the terpenes and isoprene for MnO2 on coppernets, Na2SO3, and Na2S2O3; and <90% for the terpenesand isoprene for carulite (a commercial mixture betweenMnO2, CuO, and Al2O3), CuO, and indigo carmine.
-pinene, -pinene, 3-carene, and limonene) andisoprene together with some of their oxidation products (-pinene oxide, nopinone, 4-acetyl-1-methylcyclohexene(AMCH), methylglyoxal, and methacrolein) has been studied,using various ozone-removing chemicals in an attemptto evaluate their potential as ozone scrubbers in the samplingof ambient air. The chemicals included in this firstscreening and their ozone-removing capacity are asfollows: KI, MnO2, and Na2SO3 removed ozone for morethan 24 h when exposed to 73-78 ppb (150-160 g/m3) ata sampling flow rate of 500 mL/min. Silanized poly(1,4-phenylene sulfide) (PFS) removed ozone for 5 h, unsilanizedPFS removed ozone for 1 h and 50 min, and Na2S2O3removed ozone for 20 min. The recovery of the selectedcompounds with the different scrubbers was >95% for allcompounds for KI; >95% for the terpenes oxidationproducts; >90% for the terpenes and isoprene for PFS;>90% for the terpenes and isoprene for MnO2 on coppernets, Na2SO3, and Na2S2O3; and <90% for the terpenesand isoprene for carulite (a commercial mixture betweenMnO2, CuO, and Al2O3), CuO, and indigo carmine.