Evaluation of the effect of different sampling time periods and ambient air pollutant concentrations on the performance of the Radiello® diffusive sampler for the analysis of VOCs by TD-GC/MS

被引:7
作者
Gallego, E. [1 ]
Roca, F. J. [1 ]
Perales, J. F. [1 ]
Guardino, X. [2 ]
机构
[1] UPC, LCMA, E-08028 Barcelona, Spain
[2] INSHT, Ctr Nacl Condic Trabajo, E-08034 Barcelona, Spain
来源
JOURNAL OF ENVIRONMENTAL MONITORING | 2011年 / 13卷 / 09期
关键词
VOLATILE ORGANIC-COMPOUNDS; THERMAL-DESORPTION; ADSORPTIVE ENRICHMENT; FIELD-MEASUREMENTS; BTEX MEASUREMENTS; TENAX-TA; BENZENE; RATES; 1,3-BUTADIENE; ADSORBENTS;
D O I
10.1039/c1em10075k
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
The effect of different sampling exposure times and ambient air pollutant concentrations on the performance of Radiello (R) samplers for analysis of volatile organic compounds (VOCs) is evaluated. Quadruplicate samples of Radiello (R) passive tubes were taken for 3, 4, 7 and 14 days. Samples were taken indoors during February and March 2010 and outdoors during July 2010 in La Canonja (Tarragona, Spain). The analysis was performed by automatic thermal desorption (ATD) coupled with capillary gas chromatography (GC)/mass spectrometry detection (MS). The results show significant differences (t-test, p < 0.05) between the amounts of VOCs obtained from the sum of two short sampling periods and a single equivalent longer sampling period for 65% of all the data. 17% of the results show significantly larger amounts of pollutant in the sum of two short sampling periods. Back diffusion due to changes in concentrations together with saturation and competitive effects between the compounds during longer sampling periods could be responsible for these differences. The other 48% of the results that are different show significantly larger amounts in the single equivalent longer sampling period. The remaining 35% of the results do not show significant differences. Although significant differences are observed in the amount of several VOCs collected over two shorter sampling intervals compared to the amount collected during a single equivalent longer sampling period, the ratios obtained are very close to unity (between 0.7 and 1.2 in 75% of cases). We conclude that Radiello (R) passive samplers are useful tools if their limitations are taken into account and the manufacturer's recommendations are followed.
引用
收藏
页码:2612 / 2622
页数:11
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