EurekaMag.com logo
+ Site Statistics
References:
47,893,527
Abstracts:
28,296,643
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on Google+Follow on Google+
Follow on LinkedInFollow on LinkedIn

+ Translate

Ethanol-soluble and insoluble fractions of humic substances in soil fulvic acids






Soil Science & Plant Nutrition 38(3): 391-399

Ethanol-soluble and insoluble fractions of humic substances in soil fulvic acids

Humic substances in fulvic acids (FAs) obtained as polyvinylpyrrolidone (PVP)-adsorbed fractions were further fractionated based on their solubility in ethanol. Elementary composition, IR spectra, UV-Vis spectra, saccharide contents, molecular size distribution, and 13C-NMR spectra were clearly different between the ethanol-soluble and the insoluble fractions. The yield of the ethanol-soluble fractions exceeded 80%. These fractions showed higher aromatic- and carbonyl-C contents than the insoluble fractions. The differences in the signal intensities of phenol or aryl ether C-1 and methoxyl groups in the 13C-NMR spectra (lowland paddy soil gt brown forest soil gt ando soil) as well as the aromatic-C contents (lowland paddy soil gt ando soil gt brown forest soil) of these fractions among the three soils suggested that the content and composition of the aromatic components varied depending on the soil types. Saccharides and nitrogen compounds were mainly distributed in the ethanol-insoluble fractions and it was suggested that these fractions were composed of humic substances combined with polysaccharides. The weight average molecular weights of these fractions which were 25,000-30,000, were about two times as large as those of the ethanol-soluble fractions. The lower DELTA-log K values of the insoluble fractions than those of the soluble fractions indicated the presence of structural differences in the aromatic components between the two fractions.


Accession: 002373632

DOI: 10.1080/00380768.1992.10415071



Related references

Watanabe, A.; Kuwatsuka, S., 1992: Ethanol-soluble and insoluble fractions of non-humic substances in soil fulvic acids. The non-humic substances in fulvic acids (FAs) of three Japanese soils were obtained as the non-adsorbed fraction through a column of insoluble polyvinylpyrrolidone (PVP), and this fraction was further fractionated based on the solubility in ethan...

Ertel J.R.; Hedges J.I., 1984: The lignin component of humic substances distribution among soil and sedimentary humic fulvic and base insoluble fractions. Vanillyl, syringyl and cinnamyl phenols occur as CuO oxidation products of humic, fulvic and base-insoluble residual fractions from soils, peat and nearshore marine sediments. However, none of these lignin-derived phenols were released by CuO oxid...

Watanabe, A.; Kuwatsuka, S., 1993: Properties of non-humic substances of fulvic acids fractionated by ethanol precipitation. The PVP-non-adsorbed fulvic acids (FAs), which are non-humic substance fractions of FAs, were fractionated by precipitation from an aqueous solution upon gradual addition of ethanol. The amount of precipitate increased exponentially with the incre...

Tokudome, S.; Kanno, I., 1964: Characterization of humus of humic allophane soils in Japan. 1. Humic acids (Ch)/fulvic acids (Cf) ratios. 2. Some physico-chemical properties of humic and fulvic acids. Much of the humus was bound with allophane and sesquioxides, especially of Al; fulvic acid increased with depth. Young humic allophane soils have lower C contents and larger amounts of fulvic acid than do old humic allophane soils, indicating that...

Finger, W.; Klamberg, H., 1993: Interactions between soil humic substances and metal ions: III. Complex formation of soil humic acids and soil fulvic acids with metal ions. The complex formation between isolated and analytically well characterized soil humic substances of two horizons of a podzol and a series of selected metal ions was analyzed. First, conditional stability constants for the complexes of two soil hum...

Du, J.Z.; Chang, Z.; Zhang, Z.P.; Tao, Z.Y.; Lu, C.Q., 1994: Acid dissociation constants of functional groups in humic substances: I. Affinity spectrum model analysis of potentiometric data of fulvic and humic acids solutions from weathered coal and dark loessial soil. Potentiometric experiments were carried out on the proton binding equilibria of FA extracted from a weathered coal in Henan and HA and FA extracted from a dark loessial soil from Gansu, China. The affinity spectrum model was employed to treat the...

Kile D.E.; Chiou C.T.; Brinton Terry I., 1989: Interactions of organic contaminants with fulvic and humic acids from the Suwannee River and other humic substances in aqueous systems, with inferences to the structures of humic molecules. Open-File Report - U S

Fujitake, N.; Kusumoto, A.; Yanagi, Y.; Suzuki, T.; Otsuka, H., 2003: Properties of soil humic substances in fractions obtained by sequential extraction with pyrophosphate solutions at different pHs. III. FT-IR and 1H NMR spectra of humic acids. The FT-IR and 1H NMR spectra of humic acids, which were obtained from four soils of different types (a Fibric Histosol, Dystric Cambisol, Umbric Andosol, and buried Umbric Andosol) by sequential extraction with pyrophosphate solutions at different...

Petronici, C., 1967: Studies on the organic matter of woodland soil. II. Amino acids present in the humic and fulvic acid fractions. Paper chromatography showed the presence of 17 amino acids in the humic acid fraction and 14 in the fulvic acid fraction. The amino acid content of the two fractions was however fundamentally similar.

Kile D.E.; Chiou C.T.; Brinton T.I., 1994: Interactions of organic contaminants with fulvic and humic acids from the Suwannee River and with other humic substances in aqueous systems; with inferences pertaining to the structure of humic molecules. U S