Simple and accurate quantification of BTEX in ambient air by SPME and GC-MS

TALANTA

卷:154

Article

Baimatova, Nassiba¹  Kenessov, Bulat¹  Koziel, Jacek A.²  Carlsen, Lars³  Bektassov, Marat¹  Demyanenko, Olga P.¹ 

[1] Al Farabi Kazakh Natl Univ, Fac Chem & Chem Engn, Ctr Phys Chem Methods Res & Anal, Alma Ata, Kazakhstan

[2] Iowa State Univ, Dept Agr & Biosyst Engn, Ames, IA 50011 USA

[3] Awareness Ctr, DK-4000 Roskilde, Denmark

关键词: Solid-phase microextraction;    GC-MS;    Standard addition;    BTEX;    Ambient air pollution;    Air analysis;   

DOI  :  10.1016/j.talanta.2016.03.050

来源: Elsevier

【 摘 要 】

Benzene, toluene, ethylbenzene and xylenes (BTEX) comprise one of the most ubiquitous and hazardous groups of ambient air pollutants of concern. Application of standard analytical methods for quantification of BTEX is limited by the complexity of sampling and sample preparation equipment, and budget requirements. Methods based on SPME represent simpler alternative, but still require complex calibration procedures. The objective of this research was to develop a simpler, low-budget, and accurate method for quantification of BTEX in ambient air based on SPME and GC-MS. Standard 20-mL headspace vials were used for field air sampling and calibration. To avoid challenges with obtaining and working with 'zero' air, slope factors of external standard calibration were determined using standard addition and inherently polluted lab air. For polydimethylsiloxane (PDMS) fiber, differences between the slope factors of calibration plots obtained using lab and outdoor air were below 14%. PDMS fiber provided higher precision during calibration while the use of Carboxen/PDMS fiber resulted in lower detection limits for benzene and toluene. To provide sufficient accuracy, the use of 20 mL vials requires triplicate sampling and analysis. The method was successfully applied for analysis of 108 ambient air samples from Almaty, Kazakhstan. Average concentrations of benzene, toluene, ethylbenzene and o-xylene were 53, 57, 11 and 14 mu g m(-3), respectively. The developed method can be modified for further quantification of a wider range of volatile organic compounds in air. In addition, the new method is amenable to automation. (c) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

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