Atmospheric VOC monitoring is crucial for understanding, tracking and implementing controls on sources of anthropogenic VOC emissions. VOCs are monitored around the world for their direct health effects, contribution to photochemical smog and environmental damage.
A commonly measured group of anthropogenic compounds is BTEX (Benzene, Toluene, Ethyl Benzene and Xylenes), which is often measured to provide a good marker for the total VOC concentration in urban and polluted environments.
Response Time
Additional Data
Mass Resolution
Additional Data
Detection Levels
Additional Data
Benzene Detection
Additional Data
The Kore Compact SIFT-MS provides rapid, highly selective measurement of BTEX compounds directly in ambient air. Designed for both laboratory and field deployment, the instrument delivers laboratory-quality data in real time without lengthy sample preparation.
Results in seconds
Sub-ppbv detection
Minimal interference
Laboratory or on-site
Continuous monitoring
Adaptable sampling options
Ambient air is sampled continuously through a heated inlet to minimise compound losses. Carefully selected reagent ions enable the selective detection of individual VOC species, while intuitive software provides live concentration data, trend analysis, alarms and reporting tools. The system can be calibrated using recognised gas standards and integrated into a wide range of environmental monitoring applications, making it ideal for continuous monitoring, research projects and regulatory investigations.
Real-world monitoring during vehicle refuelling demonstrates clear, repeatable detection of BTEX compounds as emissions occur.
To determine BTEX VOC concentrations in urban and industrial environments, a method for rapid, real-time quantitative measurements in the ppbv range is required. The Kore Technology PTR 3c with AnalyseHR is well suited to this analysis with sub ppbv detection limits and efficient ionisation by protonation and charge exchange of all the target compounds.
The 4 individual compounds in BTEX were measured using a gas standards generator to determine the sensitivity, limits of detection (LOD) and product ion distributions for each of the compounds.
The PTR 3c has a high sensitivity and low limit of detection for all the target compounds in BTEX analysis.
REFERENCES
https://www.aeroqual.com/what-is-btex, Accessed 20/06/2019.
http://www.gcesystems.com/what-is-btex, Accessed 20/06/2019.
We also used our high-resolution fitting software, AnalyseHR to deconvolute the mass spectra of a mixture of the BTEX compounds in simulated air samples, producing accurate VOC concentrations in a single click. The data for several mixtures were run through the AnalyseHR software to produce on-line real time concentrations.
With AnalyseHR we utilise mixed mode ionisation (Protonation and Charge exchange) in order to give greater discriminating power for mixtures of isotopes and interfering compounds. As the composition of oxygen in air and the reagent ion flows are fixed and stable, the mixed mode ionisation for AnalyseHR gives us repeatable and reliable deconvolution results.
This approach is unique to Kore Technology PTR-MS instruments.
AnalyseHR can be used for on-line analysis, plotting real time VOC concentration for VOC targets. The PTR 3c with Analyse HR is an ideal tool for quantification and deconvolution of targeted mixtures of BTEX and other VOCs.
Table 1: Sensitivity and limit of detection for BTEX for the Kore Technology PTR 3c (sensitivity derived from measurements of benzene gas standard).
Table 2 – AnalyseHR determination of compound concentrations in two simulated air BTEX mixtures (40% RH zero air with BTEX from Air Products gas standard). Data analysis time (experiment length) was 10 seconds for each mixture, with the calculation taking <1 second.
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Ultra-trace sensitivity for BTEX
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