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- W2031876788 abstract "The role of lipid components in the aggregation of several humic acids isolated from different sources was investigated using surface tensiometry. A combination of aqueous alkaline and organic solvent extractions was used to isolate two humic-like fractions (HA1 and HA2) and one lipid-like fraction from each humic acid. Fraction HA1 represents approximately two-thirds of the total organic carbon of the original humic acid and under alkaline conditions is a weak surfactant that lowers the surface tension of water by only a small amount. The HA2 fraction represents up to one-third of the humic acid and significantly lowers the surface tension of water. It is also intimately associated with the lipid fraction. Unlike the original humic acid samples, HA2 does not show micelle-like aggregation over the concentration range studied. Aggregate formation is discussed as an emergent characteristic that results from the interaction of the humic acid’s components with the lipid components serving a facilitative role." @default.
- W2031876788 created "2016-06-24" @default.
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- W2031876788 date "2009-04-01" @default.
- W2031876788 modified "2023-09-25" @default.
- W2031876788 title "Aggregation of humic acid in solution: Contributions of different fractions" @default.
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- W2031876788 doi "https://doi.org/10.1016/j.orggeochem.2009.01.010" @default.
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