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A new PTR-TOF instrument accurately measures methanol fluxes from grasslands using the eddy covariance method. Its high resolution distinguishes methanol, ensuring reliable flux data comparable to traditional instruments.

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Area of Science:

  • Environmental Science
  • Atmospheric Chemistry
  • Analytical Chemistry

Background:

  • Methanol fluxes from grasslands are important for atmospheric chemistry.
  • Accurate measurement of these fluxes requires high-time-resolution instrumentation.
  • Proton-transfer-reaction mass spectrometry (PTR-MS) is a common technique for flux measurements.

Purpose of the Study:

  • To evaluate a newly developed PTR-TOF instrument for measuring methanol fluxes.
  • To assess the instrument's capability in handling isobaric interferences at m/z 33.
  • To compare flux measurements from PTR-TOF with a conventional PTR-MS.

Main Methods:

  • Utilized the eddy covariance method with a PTR-TOF instrument.
  • Recorded full mass spectra at 10 Hz up to m/z 315.
  • Employed high mass resolving power to differentiate isobaric ions at m/z 33.
  • Compared PTR-TOF measurements with simultaneous measurements from a conventional PTR-MS.

Main Results:

  • The PTR-TOF instrument demonstrated high time resolution (10 Hz) for flux measurements.
  • High mass resolving power successfully isolated protonated methanol (m/z 33.0335) from isobaric interferences.
  • Methanol fluxes measured by PTR-TOF showed excellent agreement with those measured by a conventional PTR-MS.

Conclusions:

  • The PTR-TOF instrument is a suitable tool for accurate methanol flux measurements in grasslands.
  • Its high resolution effectively resolves spectral interferences, improving flux data reliability.
  • This validates the use of PTR-TOF for atmospheric flux studies.