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

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Revealing source signatures in ambient BTEX concentrations.

Amir Zalel¹, Yuval, David M Broday

¹Environmental, Water and Agricultural Engineering Department, Faculty of Civil and Environmental Engineering, Israel Institute of Technology, Technion, Haifa 32000, Israel.

Environmental Pollution (Barking, Essex : 1987)

|February 22, 2008

Summary

This study introduces a new method to identify sources of Volatile Organic Compounds (VOCs) in urban areas. It uses seasonal and diurnal variations in Benzene, Toluene, Ethylbenzene, and Xylenes (BTEX) to distinguish between traffic and non-traffic sources.

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Last Updated: Jul 7, 2026

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Capturing Actively Produced Microbial Volatile Organic Compounds from Human-Associated Samples with Vacuum-Assisted Sorbent Extraction

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Published on: June 1, 2022

Area of Science:

Environmental Science
Atmospheric Chemistry
Air Quality Management

Background:

Urban ozone formation is often VOC-limited, making Volatile Organic Compound (VOC) management crucial.
Decreasing traffic emissions have led to comparable contributions from traffic and non-traffic VOC sources in urban areas.
Accurate source apportionment of ambient VOCs is vital for effective urban air quality management.

Purpose of the Study:

To develop and present an approach for identifying sources of Benzene, Toluene, Ethylbenzene, and Xylenes (BTEX) in areas with low concentrations.
To address limitations of traditional source apportionment techniques in low-concentration environments.
To differentiate contributions from traffic and evaporative sources to ambient BTEX levels.

Main Methods:

Analysis of seasonal and diurnal variations in ambient BTEX concentrations.
Utilizing two monitoring stations in distinct urban areas.
Leveraging differential oxidation rates of airborne BTEX compounds for source attribution.

Main Results:

The study demonstrates the feasibility of identifying source categories based on temporal BTEX variations.
Distinct seasonal and diurnal patterns were observed, indicative of different emission sources.
Varying oxidation rates effectively allocated BTEX contributions to specific source types.

Conclusions:

The proposed approach successfully aids in identifying sources contributing to ambient BTEX concentrations, even at low levels.
Temporal variations and oxidation rates are valuable indicators for source apportionment in urban airsheds.
This method enhances the ability to manage urban air quality by pinpointing specific VOC emission sources.