Water‐soluble organic carbon (WSOC) was extracted from the surface horizon (0–15 cm) of a South Carolina floodplain soil (Pickney series‐sandy, silicious, thermic Cumulic Humaquepts) using either 1.2‐µm Whatman glass fiber type C (GF) or polycarbonate (PC) (<0.4 µm) filters. The trend in functional group C distribution for both WSOC fractions was O‐alkyl > aliphatic > aromatic > carboxylic acid > carbonyl structures. Overall, the 13C NMR spectra showed similar functional group C distributions for fractions obtained with both filters.
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Novak et al. (1992) studied this question.
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