Journal ArticleDOI
Hymatomelanic acids as polyelectrolytes. I. Viscometric and osmometric studies
Kunal Ghosh,S. K. Mukherjee +1 more
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In this paper, the polyelectrolyte character of four natural and ten synthetic hymatomelanic acids, synthesized from possible monomers both in the presence and absence of catalysts, was established by means of viscosity measurements.Abstract:
The polyelectrolyte character of four natural and ten synthetic hymatomelanic acids, synthesized from possible monomers both in the presence and absence of catalysts, was established by means of viscosity measurements. Intrinsic viscosities were evaluated for the purpose of comparison. The number-average molecular weights of some typical natural and synthetic hymatomelanic acids were determined from osmotic pressure measurements. Using the Flory-Fox relationship in an approximate manner, the root-mean-square average end-to-end separations were also evaluated.read more
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Journal ArticleDOI
The supramolecular structure of humic substances
TL;DR: In this paper, the scientific understanding of the molecular size and shape of humic substances (HS) is critically reviewed and the traditional view that HS are polymers in soil is not substantiated by any direct evidence but is assumed only on the basis of laboratory experiments with model molecules and unwarranted assumptions.
Book ChapterDOI
The supramolecular structure of humic substances: A novel understanding of humus chemistry and implications in soil science
TL;DR: A review of the scientific understanding of the molecular structure of humic substances can be found in this paper, where a large body of evidence suggests that the traditional view that humic compounds are polymers in soil is not substantiated by any direct evidence but only assumed on the basis of laboratory experiments with model molecules and unwarranted results by incorrectly applying either analytical procedures or mathematical treatments developed for purified and undisputed biopolymers.
Journal ArticleDOI
Uv and visible absorption spectroscopic investigations in relation to macromolecular characteristics of humic substances
Kunal Ghosh,Morris Schnitzer +1 more
TL;DR: In this article, the spectral ranges examined were 200-350 nm and 350-700 nm, and the results were drawn on the basis of absorption intensities in optical density (O.D.) vs. wavelength (λ) curves, slopes of log O.D. vs. log λ plots, nature of shoulders in the 250-270 nm region, and E4/E6 ratios.
Journal ArticleDOI
Particle and structure characterization of fulvic acids from agricultural soils
TL;DR: In this article, a detailed characterization of fulvic acids derived from agricultural soils varied with physicochemical properties was carried out, and the results indicated that FAs mainly exist as small molecules that form molecular aggregates or associations in solutions.
Journal ArticleDOI
Molecular configuration of compost's humic acid by viscometric studies
TL;DR: In this paper, the macromolecular configuration of humic acid sample obtained from Farm Yard Manure was investigated by viscometric measurements at varying sample concentrations and in presence of a neutral electrolyte.