Ozone removal in the sampling of parts per billion levels of terpenoid compounds: An evaluation of different scrubber materials

被引:51
作者
Fick, J
Pommer, L
Andersson, B [1 ]
Nilsson, C
机构
[1] Umea Univ, Dept Chem Environm Chem, SE-90187 Umea, Sweden
[2] Nalt Inst Working Life, Ctr Musculoskeletal Res, SE-90713 Umea, Sweden
[3] Swedish Univ Agr Sci, Dept Agr Res No Sweden Chem & Biomass, SE-90403 Umea, Sweden
关键词
D O I
10.1021/es0001456
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
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 poten tial as ozone scrubbers in the sampling of ambient air. The chemicals included in this first screening and their ozone-removing capacity are as follows: Kl, MnO2, and Na2SO3 removed ozone for more than 24 h when exposed to 73-78 ppb (150-160 mug/m(3)) at a sampling flow rate of 500 mL/min. Silanized poly(1,4-phenylene sulfide) (PFS) removed ozone far 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 ail compounds for Kl; >95% for the terpenes oxidation products; >90% for the terpenes and isoprene for PFS; >90% for the terpenes and isoprene for MnO1 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.
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页码:1458 / 1462
页数:5
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