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@ARTICLE{Wei:836748,
      author       = {Wei, Jing and Zhou, Minghua and Vereecken, Harry and
                      Brüggemann, Nicolas},
      title        = {{L}arge variability in {CO} 2 and {N} 2 {O} emissions and
                      in 15 {N} site preference of {N} 2 {O} from reactions of
                      nitrite with lignin and its derivatives at different p{H}},
      journal      = {Rapid communications in mass spectrometry},
      volume       = {31},
      number       = {16},
      issn         = {0951-4198},
      address      = {New York, NY},
      publisher    = {Wiley Interscience},
      reportid     = {FZJ-2017-05801},
      pages        = {1333 - 1343},
      year         = {2017},
      abstract     = {RationaleChemodenitrification is an important N2O source in
                      soil; however, knowledge about the production of CO2 and N2O
                      from abiotic nitrite-SOM reactions, especially the N2O
                      isotopic signatures (intramolecular 15N site preference
                      (SP), and δ15Nbulk and δ18O values), is quite limited at
                      present.MethodsN2O and CO2 emissions from chemical reactions
                      of nitrite with lignin products were determined with gas
                      chromatography, and their response surfaces as a function of
                      pH from 3 to 6 and nitrite concentration from 0.1 to 0.5 mM
                      were explored with polynomial regression. The intramolecular
                      15N distribution of N2O, as well as δ15Nbulk and δ18O
                      values, were measured with an isotope ratio mass
                      spectrometer coupled to an online pre-concentration unit.
                      The variability in N2O SP values was tested from pH 3 to 5,
                      and for nitrite concentrations from 0.3 to 0.5
                      mM.ResultsBoth CO2 and N2O emissions varied largely with pH
                      and the structure of lignin products. The highest N2O
                      emission occurred at pH 4–5 in
                      4-hydroxy-3,5-dimethoxybenzaldehyde and
                      4-hydroxy-3,5-dimethoxybenzoic acid treatments, and at pH 3
                      in the treatments with lignin,
                      4-hydroxy-3-methoxybenzaldehyde, 4-hydroxy-3-methoxybenzoic
                      acid, 4-hydroxybenzaldehyde, and 4-hydroxybenzoic acid. A
                      wide range of N2O SP values (11.9–37.4‰), which was pH
                      dependent and not distinguishable from microbial pathways,
                      was observed at pH 3–5. The δ15Nbulk and δ18O values of
                      N2O were both in a similar range to that reported for fungal
                      denitrification and bacterial
                      denitrification.ConclusionsThese results present the first
                      characterization of the isotopic composition of N2O from
                      chemodenitrification in pure chemical assays. Chemical
                      reactions of nitrite with lignin are pH-dependent and
                      associated with substantial CO2 and N2O emissions. The SP
                      values of N2O derived from chemodenitrification were neither
                      distinguishable from the biotic pathways nor remained stable
                      with varying pH. Therefore, the use of N2O isotopic
                      signatures for source partitioning is restricted when
                      chemodenitrification is contributing significantly to N2O
                      emission.},
      cin          = {IBG-3},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {255 - Terrestrial Systems: From Observation to Prediction
                      (POF3-255)},
      pid          = {G:(DE-HGF)POF3-255},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000405635200004},
      pubmed       = {pmid:28557104},
      doi          = {10.1002/rcm.7912},
      url          = {https://juser.fz-juelich.de/record/836748},
}