Chromatographia

, Volume 80, Issue 8, pp 1249–1256 | Cite as

Quantification of BTEX in Soil by Headspace SPME–GC–MS Using Combined Standard Addition and Internal Standard Calibration

  • Dina Orazbayeva
  • Bulat Kenessov
  • Jacek A. Koziel
  • Dayana Nassyrova
  • Nadezhda V. Lyabukhova
Original

Abstract

There is a great demand for simple, fast and accurate methods for quantification of volatile organic contaminants in soil samples. Solid-phase microextraction (SPME) has a huge potential for this purpose, but its application is limited by insufficient accuracy caused by a matrix effect. The aim of this research was to develop the method for BTEX quantification in soil using combined standard addition (SA) and internal standard (IS) calibration. Deuterated benzene (benzene-d6) was used as the internal standard for all analytes. The optimized method includes spiking replicate samples with different concentrations of BTEX standards and the same concentration of benzene-d6, equilibration of soil samples at 40 °C during 2 h, and SPME–GC–MS analysis. Precision and accuracy of IS and SA methods were compared on different soil matrices. Combined SA + IS method provided more precise calibration plots compared to the conventional SA calibration. The SA + IS calibration provided more precise and accurate results compared with a reference method based on solvent extraction followed by GC–MS when applied to BTEX quantification in real soil samples (spiked with diesel fuel and aged). Recoveries of BTEX from soil samples spiked with known concentrations of analytes using the developed method were in the range of 73–130% with RSD values less than 15% for all BTEX. The proposed simultaneous standard addition and internal standard approach can be advantageous and adopted for improved quantification of other toxic VOCs in soil.

Keywords

SPME BTEX quantification Soil analysis Matrix effect Standard addition Internal standard 

Supplementary material

10337_2017_3340_MOESM1_ESM.docx (175 kb)
Supplementary material 1 (DOCX 174 kb)

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Copyright information

© Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  • Dina Orazbayeva
    • 1
  • Bulat Kenessov
    • 1
  • Jacek A. Koziel
    • 2
  • Dayana Nassyrova
    • 1
  • Nadezhda V. Lyabukhova
    • 1
  1. 1.Faculty of Chemistry and Chemical Technology, Center of Physical Chemical Methods of Research and AnalysisAl-Farabi Kazakh National UniversityAlmatyKazakhstan
  2. 2.Department of Agricultural and Biosystems EngineeringIowa State UniversityAmesUSA

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