Preprints
https://doi.org/10.5194/amt-2020-498
https://doi.org/10.5194/amt-2020-498

  04 Feb 2021

04 Feb 2021

Review status: a revised version of this preprint is currently under review for the journal AMT.

On-line SPME derivatization for the sensitive determination of multi-oxygenated volatile compounds in air

Esther Borrás1, Luis A. Tortajada-Genaro2, Milagros Ródenas1, Teresa Vera1, Thomas Speak3, Paul Seakins3, Marvin D. Shaw4, Alastair C. Lewis4, and Amalia Muñoz1 Esther Borrás et al.
  • 1Fundación Centro de Estudios Ambientales del Mediterráneo (CEAM), 46980 Paterna, Valencia, Spain
  • 2Departamento de Química-Instituto IDM. Universitat Politècnica de València, 46022, Valencia, Spain
  • 3University of Leeds, LS2 9JT, Leeds, UK
  • 4National Centre for Atmospheric Science, University of York, York YO10 5DD, UK

Abstract. Multi-oxygenated volatile organic compounds are important markers of air pollution and precursors of ozone and secondary aerosols in both polluted and remote environments. Herein, their accurate determination was enhanced. The approach was based on an automated system for active sampling and on-fiber derivatization coupled with GC-MS technique. The method capability was determined for different compound families, such as aldehydes, ketones, α-dicarbonyls, hydroxy-aldehydes, hydroxy-ketones and, carboxylic acids. A good accuracy (< 7 %) was demonstrated from the results compared to Fourier-transform infrared spectroscopy (FTIR). Detection limits of 6–100 pptV were achieved with a time resolution lower than 20 min. The developed method was successfully applied to the determination of multi-oxygenated compounds in air samples collected during an intercomparison campaign (EUROCHAMP-2020 project). Also, its capability and accuracy for atmospheric monitoring was demonstrated in an isoprene ozonolysis experiment. Both were carried out in the high-volume outdoor atmospheric simulation chambers (EUPHORE, 200 m3).

In summary, our developed technique offers near-real-time monitoring with direct sampling, which is an advantage in terms of handling and labour time for a proper quantification of trace-levels of atmospheric multi-oxygenated compounds.

Esther Borrás et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Esther Borrás et al.

Esther Borrás et al.

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Short summary
This work presents promising results in the characterization of specific atmospheric pollutants (oxygenated VOCs) present at very low concentrations but highly relevant. We carried out this research at EUPHORE facilities within the framework of the EUROCHAMP project, where we wanted to obtain a method with high robustness and precision, also being clean in the use of solvents, low-cost and easily adaptable for use in mobile laboratories for air quality monitoring.