% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@TECHREPORT{Ehhalt:136082,
      author       = {Ehhalt, D. H. and Schmidt, U. and Arlander, D. W.},
      title        = {{D}istribution of {C}1 - {C}2 {A}ldehydes in the {F}ree
                      {T}roposphere},
      number       = {Juel-2650},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {PreJuSER-136082, Juel-2650},
      series       = {Berichte des Forschungszentrum Jülich},
      pages        = {127 S.},
      year         = {1992},
      note         = {Record converted from JUWEL: 18.07.2013},
      abstract     = {A sensitive and selective measurement technique for the
                      determination of tropospheric formaldehyde and acetaldehyde
                      in background air is described . The method is based on the
                      derivatization of aldehydes with 2,4 dinitrophenylhydrazine
                      (DNPH) . The derivative aldehyde hydrazones are then
                      separated using high performance liquid chromatography
                      (HPLC) and detected at 355 nm using a conventional HPLC
                      UV/VIS absorbance detector. Aldehydes were collected with
                      Waters Sep-Pak C®18 DNPHcoated cartridges using a portable
                      sampling system . The apparatus proved to be easy and
                      convenient to operate, even in remote clean air locations
                      where aldehyde mixing ratios and their natural variations
                      are likely to be of special interest in air chemistry. The
                      method was used for ground-based measurements of
                      formaldehyde and acetaldehyde during an uninterupted
                      two-week period in August 1990 in Jülich . Ground level
                      measurements in Jülich for formaldehyde and acetaldehyde
                      were shown to vary from 0 .5 to 7 ppb and 0 .1 to 2 .0 ppb,
                      respectively . Diurnal mean mixing ratios of, formaldehyde
                      and acetaldehyde were 2 .8 +/® 1 .5 ppb and 0 .7 -+/® 0 .4
                      ppb respectively . Significant diurnal patterns were
                      observed with maximum mixing ratios in the early afternoons,
                      and minimum mixing ratios shortly before sunrise . A
                      potential interference from organic hydroperoxides is also
                      discussed. ~n~'r cr ai6~ 9 ~ Lv~ vr.m. $ re measurements up
                      ac .o nearly ~ 8L811 är J=s t he s.~ai ;f ei a•®rs-I an,
                      in z vi av,=-rns, -F ver‘fw { .°174YiF.9'i ®~fl to
                      November 1 9 4 0 showed the potential of cartridge-based
                      methods for aldehyde measurements in the free troposphere .
                      These test flights indicated that formaldehyde vertical
                      profiles can be dependent on inversion height and cloud
                      frequency . In-cloud formaldehyde measurements tended to be
                      lower than gas-phase measurements},
      cin          = {ICG-2},
      ddc          = {500},
      cid          = {I:(DE-Juel1)VDB791},
      typ          = {PUB:(DE-HGF)29},
      url          = {https://juser.fz-juelich.de/record/136082},
}