Monitoring Trace VOCs in the Atmosphere with PTR-TOF

PTR-MS is the benchmark technique for rapid, quantitative and ultra-sensitive analysis of nearly the whole range of atmospheric organics. This method is used in an extensive range of applications in environmental studies.

Monitoring Trace VOCs in the Atmosphere with PTR-TOF

Image Credit: IONICON Analytik

Introduction

  • Rugged and consistent technology for sampling volatile organic compounds in the atmosphere at ultra-low trace levels (lower than or equal to single-digit pptV).
  • PTR-TOFMS enables both targeted (for example, aromatic species monitoring) and untargeted analyses (for example, oxidation products analysis) of users’ samples on a molecular composition level.
  • H3O+ primary reagent ions quantitatively ionize nearly the whole range of atmospheric non-methane organics.
  • Even the stickiest compounds (for example, highly oxidized compounds or PAHs) can be examined with IONICON’s EVR option. 
  • Users can expand the capability of their PTR-TOFMS from the gas phase to the particle phase using the genuine CHARON particle inlet from IONICON.
  • Supplementary acquisition modes improve the selectivity of users’ measurements, which involve the isolation of isomers by the FastGC method, or the use of alternative reagent ions, such as NH4+ and NO+.

Monitoring Trace VOCs in the Atmosphere with PTR-TOF

Image Credit: IONICON Analytik

Applications

Emission Studies

Emission analyses potentially reflect one of the widest ranges of applications for PTR-MS. A common feature in these analyses is that they usually need a high dynamic range to detect VOCs from sub-pptV concentrations of up to ppmV levels. This range is easily covered by PTR-MS. Standard emission studies are as follows:

Monitoring Trace VOCs in the Atmosphere with PTR-TOF

Image Credit: IONICON Analytik

Reaction Kinetics Studies

PTR-MS is the perfect analytical equipment to comprehend the reaction kinetics that takes place in the air. Through the H3O+ mode, the rise of primary products and the photochemical decay of parent molecules can be quantitatively tracked.

The NH4+ mode is even softer and perfect for characterizing more oxidized products, such as peroxides and esters. Reaction kinetics analyses include the following:

Measurements on Mobile Platforms

PTR-MS is a highly rugged technology that could be deployed in or on mobile platforms. Users can take a look at the specialized mobile VOC monitor PTR-TOF QB or contact IONICON for tailored mobile solutions. Potential platforms are as follows:

IONICON Analytik

This information has been sourced, reviewed and adapted from materials provided by IONICON Analytik.

For more information on this source, please visit IONICON Analytik.

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