Trace gases

from Wikipedia, the free encyclopedia

As trace gases all gases referred to, which in the air present in smaller proportions than the three main components of nitrogen (78%), oxygen (21%) and argon (about 1%). The trace gases include the non-reactive noble gases such as neon , helium and krypton . Other trace gases are harmful to the environment, see air pollution and greenhouse gas , while others contribute significantly to the production of hydroxyl radicals due to their high reactivity , which in turn can act as “cleaning agents” for the atmosphere. Reactive halogen compounds can, for example, contribute significantly to ozone depletion , even in low concentrations of a few ppt , both in the troposphere and - as in the ozone hole - in the stratosphere . Some trace gases, e.g. B. ozone , have different meanings at different levels. For a list of some trace gases see air .

Trace gases in the atmosphere can u. Even in extremely low concentrations . a. can be measured by means of ion mobility spectrometers , infrared spectroscopy or differential optical absorption spectroscopy .

literature

  • John Burrows, Herbert Fischer, Klaus F. Künzi, Klaus Pfeilsticker, Ulrich Platt, Andreas Richter, Martin Riese, Gabriele Stiller, Thomas Wagner: Atmospheric trace substances and their probing. In: Chemistry in Our Time . 41 (3), 2007, pp. 170-191, doi: 10.1002 / ciuz.200700426 .
  • C. Clerbaux, J. Drummond, J.-M. Flaud, J. Orphal: "Thermal Infrared: Absorption and Emission - Trace Gases and Parameters", Chapter 3 (pp. 123–152) in: "The Remote Sensing of Tropospheric Composition from Space", Editors JP Burrows, U. Platt and P. Borrell, ISBN 978-3-642-14790-6 , Springer Verlag, Heidelberg and New York, 2011.

Similar word formations

  • Trace elements are chemical elements in low concentrations of a certain substance.