𝔖 Bobbio Scriptorium
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Soil management system effects on size fractionated humic substances

✍ Scribed by E.H Novotny; W.E.H Blum; M.H Gerzabek; A.S Mangrich


Book ID
117119641
Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
505 KB
Volume
92
Category
Article
ISSN
0016-7061

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Size fractionation of humic substances:
✍ H.Kipton J. Powell; Eric Fenton πŸ“‚ Article πŸ“… 1996 πŸ› Elsevier Science 🌐 English βš– 990 KB

## Humic substances have been extracted from a standard reference peat at pH 2.0, 6.0-6.5, 9.0 and 12.0 using 0.01 M or 0.001 M Na4P207. Humic acids extracted at pH 6.0, 9.0 and 12.0 showed a progressive increase in mean molecular size, as determined by gel permeation chromatography. With increasi

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Models of carboxyl acidity frequently applied to humic substances (HS) are examined by potentiometric titrations of polycarboxylic acids of intermediate size (N = number of acid groups = 3-70). The unique properties of these acids are not well described by extrapolation from small (N = 1 or 2) or la