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Table 2 Functional groups (%) detected in 13C CP/TOSS NMR Spectra of demineralized sediments (DM) collected at different sites (B1, A01, and A04) from the Pearl river delta and their fractions (LF and NHC)

From: Composition and structure of natural organic matter through advanced nuclear magnetic resonance techniques

Samples Alkyl C 0–48 ppm OCH3/NCH 48–65 ppm Alkyl C–O 65–91 ppm O–alkyl–O 91–110 ppm Arom C–C 91–150 ppm Arom C–H 91–150 ppm Arom C–O 150–165 ppm COO/NC=O 150–165 ppm (CH2)n Aromatic Ca Polar Cb
DM
 B1 27.4 12.0 15.9 3.27 18.6 13.0 4.36 5.57 8.30 35.9 46.1
 A01 32.4 11.8 13.6 3.56 15.6 12.3 4.81 5.84 9.50 32.8 45.6
 A04 25.6 11.8 14.6 4.83 23.0 7.38 5.46 7.29 7.70 35.9 46.9
LF
 B1 22.0 12.6 17.2 3.08 19.6 14.9 4.68 5.89 6.50 39.2 46.9
 A01 27.3 12.9 13.6 3.04 19.8 11.3 5.30 6.73 8.30 36.4 46.8
 A04 23.0 12.2 15.6 3.25 21.0 12.7 5.19 7.21 6.40 38.8 46.6
NHC
B1 24.6 9.39 8.12 1.05 23.6 22.7 5.62 4.95 7.90 51.9 36.0
 A01 29.2 9.43 8.37 1.32 22.1 18.7 5.94 4.95 10.7 46.7 39.4
 A04 24.0 8.81 8.15 1.18 26.2 19.1 6.68 5.87 7.70 52.0 37.2
  1. a Aromatic C aromatic C–C (91–150 ppm) + aromatic C–H (91–150 ppm) + aromatic C–O (150–165 ppm) (%)
  2. b Polar C polar aliphatic (48–91 ppm) + polar aromatic and C=O (150–190 ppm)