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- W2052176321 abstract "Freshwater humic substances from Lake Celyn, Gwynedd, N. Wales have been investigated by 13C-NMR spectroscopy. Carboxyl, aromatic, o-alkyl and alkyl resonances can be recognised. Varying pulse delay from 0.43 s to 2.5 sec has little effect on the magnitude of the signal ascribed to aromatic carbon, but there is a small nuclear Overhauser effect (1.45 at a pulse delay of 0.8 sec). The results show-that 24% of the Lake Celyn humic acid carbon is carboxyl and 40% is aromatic. The high proportion of aromatic carbon suggests the Lake Celyn humic acid is largely formed from terrestrial humic substances from the surrounding peaty watershed." @default.
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- W2052176321 date "1981-10-01" @default.
- W2052176321 modified "2023-10-14" @default.
- W2052176321 title "The structure of freshwater humic substances as revealed by 13C-NMR spectroscopy" @default.
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- W2052176321 doi "https://doi.org/10.1016/0016-7037(81)90008-9" @default.
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