Abstract
Humic acids extracted from fluvial, estuarine and marine sediments from the eastern coast of Florida were studied by CP/MAS 13C nuclear magnetic resonance. The freshwater humic acid contained a large percentage of lignin-derived aromatic carbon whereas the offshore marine samples contained large amounts of aliphatic carbon. The aliphatic carbon of the marine humic acids was more highly branched than that found for freshwater and estuarine sediments. Despite significant differences in the relative amounts and types of carbon present, conditional formation constants for Cu(II)-humic acid were very similar.
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