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@TECHREPORT{Ehhalt:136081,
      author       = {Ehhalt, D. H . and Schmidt, U. and Lowe, D. C.},
      title        = {{T}he {T}ropospheric {D}istribution of {F}ormaldehyde},
      volume       = {1756},
      number       = {Juel-1756},
      address      = {Jülich},
      publisher    = {Kernforschungsanlage Jülich GmbH, Zentralbibliothek,
                      Verlag},
      reportid     = {PreJuSER-136081, Juel-1756},
      series       = {Berichte der Kernforschungsanlage Jülich},
      pages        = {100 S.},
      year         = {1981},
      note         = {Record converted from JUWEL: 18.07.2013},
      abstract     = {A new measurement technique for determining the very low
                      formaldehyde (HCHO) concentrations in clean air is
                      described. The method is based on the standard
                      derivatisation of formaldehyde with
                      2,4-dinitrophenylhydrazine. The derivative, formaldehyde
                      2,4-dinitrophenylhydrazone, is seperated using high
                      performance liquid chromatography and detected at 254 nm
                      with a conventional UV absorbance detector. Formaldehyde was
                      sampled using a specially developed battery powered portable
                      apparatus. This equipment proved to be easy and convenient
                      to operate, even in remote clean air locations where the
                      formaldehyde mixing ratio and its natural variations are
                      likely to be of especial interest in air chemistry. The
                      sampling and analysis technique have been used to measure
                      tropospheric mixing ratios at various places in Europe and
                      New Zealand as well as during a ship cruise in the North and
                      South Atlantic. In addition vertical profiles of the
                      formaldehyde mixing ratio were obtained during several
                      aircraft flights up to 7 km above the Eifel district of the
                      Federal Republic of Germany. The results of the measurements
                      show that formaldehyde mixing ratios in clean air are very
                      low. At ground level, values are about 0.2 ppbv and decrease
                      with altitude, with values under 0.1 ppbv at 7 km being
                      observed. In clean maritime air no significant difference in
                      the formaldehyde mixing ratio between the hemispheres was
                      observed. In the mid Atlantic, diurnal variations of the
                      formaldehyde mixing ratio showing weak maxima during the
                      early afternoon were occasionally observed. These variations
                      were attributed to the diurnal behaviour of the
                      photochemical production and destruction of formaldehyde
                      during stable weather conditions. Measurements in polluted
                      air at Jülich in the Federal Republic of Germany and in the
                      continental boundary layer showed high variable mixing
                      ratios which were undoubtedly due to industrial and
                      vehicular sources of formaldehyde.},
      cin          = {ICG-2},
      ddc          = {540},
      cid          = {I:(DE-Juel1)VDB791},
      typ          = {PUB:(DE-HGF)29},
      url          = {https://juser.fz-juelich.de/record/136081},
}