| Title: | Simple and accurate quantification of BTEX in ambient air by SPME and GC-MS |
| Author(s): | Baimatova N; Kenessov B; Koziel JA; Carlsen L; Bektassov M; Demyanenko OP; |
| Address: | "Al-Farabi Kazakh National University, Faculty of Chemistry and Chemical Engineering, Center of Physical Chemical Methods of Research and Analysis, Almaty, Kazakhstan. Electronic address: baimatova@cfhma.kz. Al-Farabi Kazakh National University, Faculty of Chemistry and Chemical Engineering, Center of Physical Chemical Methods of Research and Analysis, Almaty, Kazakhstan. Electronic address: bkenesov@cfhma.kz. Iowa State University, Department of Agricultural and Biosystems Engineering, Ames, IA 50011, USA. Electronic address: koziel@iastate.edu. Awareness Center, Trekroner, DK-4000 Roskilde, Denmark. Electronic address: LC@AwarenessCenter.dk. Al-Farabi Kazakh National University, Faculty of Chemistry and Chemical Engineering, Center of Physical Chemical Methods of Research and Analysis, Almaty, Kazakhstan" |
| DOI: | 10.1016/j.talanta.2016.03.050 |
| ISSN/ISBN: | 1873-3573 (Electronic) 0039-9140 (Linking) |
| Abstract: | "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 20mL 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 14microgm(-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" |
| Keywords: | Benzene Benzene Derivatives Benzenesulfonates *Gas Chromatography-Mass Spectrometry *Solid Phase Microextraction Toluene Xylenes Air analysis Ambient air pollution Btex Gc-ms Solid-phase microextraction Standard addition; |
| Notes: | "MedlineBaimatova, Nassiba Kenessov, Bulat Koziel, Jacek A Carlsen, Lars Bektassov, Marat Demyanenko, Olga P eng Research Support, Non-U.S. Gov't Netherlands 2016/05/08 Talanta. 2016 Jul 1; 154:46-52. doi: 10.1016/j.talanta.2016.03.050. Epub 2016 Mar 16" |
