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Updated: Sep 13, 2025

Real-time Breath Analysis by Using Secondary Nanoelectrospray Ionization Coupled to High Resolution Mass Spectrometry

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High Sensitivity Online Sensor for BTEX in Ambient Air Based on Multiphoton Electron Extraction Spectroscopy.

Uriah H Sharon¹, Lea Birkan¹, Valery Bulatov¹

¹Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa 32000, Israel.

Sensors (Basel, Switzerland)

|July 30, 2025

Summary

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A new Multiphoton Electron Extraction Spectroscopy (MEES) method detects benzene, toluene, ethylbenzene, and xylene (BTEX) in ambient air at ppt levels. This sensitive technique offers distinct spectral signatures for BTEX compounds, advancing air quality monitoring.

Area of Science:

Analytical Chemistry
Environmental Science
Spectroscopy

Background:

Benzene, toluene, ethylbenzene, and xylene (BTEX) are prevalent volatile organic compounds contributing to air pollution.
Strict regulatory limits necessitate sensitive and selective monitoring of BTEX in ambient air.

Purpose of the Study:

To introduce and validate Multiphoton Electron Extraction Spectroscopy (MEES) for online BTEX detection.
To demonstrate MEES's capability for sensitive and selective quantitation of BTEX compounds at ambient conditions.

Main Methods:

Utilized tunable UV laser pulses for resonant ionization of BTEX molecules.
Applied a high electrical field to induce ionization and measured the generated photocurrent.
Developed MEES for real-time, online monitoring of BTEX in ambient air.

Keywords:

BTEX VOC electronic nose (e-nose)environmental monitoring gas trace detection gas-phase MEES multiphoton electron extraction spectroscopy trace gas analysis

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Last Updated: Sep 13, 2025

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Main Results:

Achieved detection of BTEX compounds in ambient air at the part-per-trillion (ppt) concentration range.
Obtained distinct spectral signatures for each BTEX compound, including individual xylene isomers.
Demonstrated the sensitivity and selectivity of the MEES technique for BTEX analysis.

Conclusions:

MEES is an innovative and effective technique for sensitive, selective, and online detection of BTEX.
The method offers significant advancements for environmental sensing and industrial air quality control.
MEES provides a powerful new tool for monitoring BTEX pollution.