[Automatic continuous monitoring of volatile organic compounds using ion mobility spectrometer array]

Area of Science:

• Analytical Chemistry
• Spectroscopy
• Environmental Monitoring

Context:

• Traditional ion mobility spectrometers have limitations in detection range and compound identification accuracy.
• Volatile organic compounds (VOCs) pose risks to air quality and human health, necessitating sensitive detection methods.
• Distinguishing between similar VOCs often requires advanced analytical techniques.

Purpose:

• To design and develop an ion mobility spectrometer array with an expanded detection range and enhanced compound identification capabilities.
• To integrate multiple ionization sources (63Ni positive/negative ion modes, photoionization) for comprehensive VOC analysis.
• To enable continuous monitoring of airborne VOCs with improved accuracy.

Summary:

• A new ion mobility spectrometer array combining 63Ni positive/negative ion modes and photoionization was developed for continuous VOC monitoring.
• The instrument successfully identified challenging compounds like acrylonitrile, m-xylene, and acetone, which were difficult to distinguish previously.
• Quantitative analysis of acetone demonstrated a 2-order linear range (R > 0.995), and continuous monitoring of methacrylate leaks showed direct correlation between leaking time and concentration.

Impact:

• Provides a more accurate and broader detection method for volatile organic compounds in air.
• Facilitates the identification of complex mixtures of VOCs, crucial for environmental and safety applications.
• Enables real-time, quantitative monitoring of specific airborne contaminants, aiding in pollution control and leak detection.