Table 2 DOM composition in pore waters as obtained from Fourier transform ion cyclotron resonance mass spectrometry analysis (pooled pore-water volume from 0 to 10 cm).

Molecular weight for the molecules detected ranged from 406 to 461. Hydrogen and oxygen to carbon ratio (intensity weight average) ranged from 1.2 to 1.3 and 0.4 to 0.5, respectively. AImod, aromaticity index; DBE, double-bond equivalents; total CHO, CHON, and CHOP, percentage of formulae containing carbon, hydrogen, and phosphorus; total S-bearing compounds, percentage of formulae containing sulfur-bearing compounds.

DOC (μM)
and extraction
efficiency (%)
TDN (μM)
and extraction
efficiency (%)
DOC/TDN
molar ratio
Group of
formulae
No. of
formulae
AImodwaDBEwaTotal
CHO
Total
CHON
Total
CHOP
Total
S-bearing
compounds
Oxic387 (51%)58 (12%)6.6Exclusive oxic6780.28.833452817
Anoxic275 (80%)81 (10%)3.4Exclusive anoxic6260.39.314271257
Common
formulae
52870.27.43739122