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Table 3 Average (by number and magnitude-weighted) mass spectral characteristics for each sample

From: Characterization of terrestrial dissolved organic matter fractionated by pH and polarity and their biological effects on plant growth

Sample O/C H/C DBE DBE/C %CHO %CHON %CHOS
num mag num mag num mag num mag num mag num mag num mag
Whole 0.58 0.61 0.91 0.87 12.9 12.9 0.60 0.62 69% 87% 17% 8% 13% 5%
Acid insoluble 0.37 0.37 0.95 0.95 13.2 12.9 0.57 0.57 82% 87% 16% 11% 2% 2%
Acid soluble 0.57 0.60 0.94 0.91 12.5 12.5 0.58 0.60 70% 87% 19% 9% 11% 4%
C18 Fil:Ret 100:0 0.64 0.67 0.91 0.89 11.7 11.6 0.61 0.61 64% 84% 21% 9% 15% 7%
C18 Fil:Ret 75:25 0.57 0.60 0.94 0.90 12.3 12.3 0.58 0.60 73% 88% 18% 8% 9% 3%
C18 Fil:Ret 50:50 0.53 0.55 0.96 0.94 12.4 12.4 0.57 0.58 76% 90% 17% 7% 7% 2%
C18 Fil:Ret 25:75 0.51 0.51 0.97 0.96 12.8 12.7 0.56 0.57 75% 91% 17% 7% 8% 2%
C18 Fil:Ret 0:100 0.45 0.46 0.96 0.97 14.1 13.6 0.56 0.56 75% 91% 18% 7% 6% 2%
  1. DBE (double bond equivalents) = (2c + 2 + n + p - h)/2 for any formula CcHhOoNnSsPp
  2. DBE/C: double bond equivalents normalized to the number of carbon atoms in the formula
  3. num indicates that the value given in number-averaged
  4. mag indicates that the value given in magnitude-weighted
  5. The van Krevelen diagrams are shown in Figure 5.