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Titolo:
Separation of structural components in soil organic matter by diffusion ordered spectroscopy
Autore:
Simpson, AJ; Kingery, WL; Spraul, M; Humpfer, E; Dvortsak, P; Kerssebaum, R;
Indirizzi:
Mississippi State Univ, Dept Plant & Soil Sci, Mississippi State, MS 39762USA Mississippi State Univ Mississippi State MS USA 39762 State, MS 39762USA Bruker Analyt GMBH, D-76287 Rheinstettern, Germany Bruker Analyt GMBH Rheinstettern Germany D-76287 Rheinstettern, Germany
Titolo Testata:
ENVIRONMENTAL SCIENCE & TECHNOLOGY
fascicolo: 22, volume: 35, anno: 2001,
pagine: 4421 - 4425
SICI:
0013-936X(20011115)35:22<4421:SOSCIS>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
NUCLEAR-MAGNETIC-RESONANCE; HUMIC SUBSTANCES; MOLECULAR-WEIGHT; NMR; DISTRIBUTIONS; COEFFICIENTS; ACIDS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Engineering, Computing & Technology
Citazioni:
28
Recensione:
Indirizzi per estratti:
Indirizzo: Simpson, AJ Ohio State Univ, Dept Chem, Box 67,100 W 18th Ave, Columbus, OH 43210 USA Ohio State Univ Box 67,100 W 18th Ave Columbus OH USA 43210 SA
Citazione:
A.J. Simpson et al., "Separation of structural components in soil organic matter by diffusion ordered spectroscopy", ENV SCI TEC, 35(22), 2001, pp. 4421-4425

Abstract

Diffusion ordered spectroscopy (DOSY) was applied to two extracts of organic matter from the surface horizon of an oak forest soil. It was possible to identify and confirm the presence of numerous aliphatic, aromatic, sugar,and amino acid components that could be separated on the basis of diffusion in DMSO-d(6) and D2O. On average, sugar components were identified as thelargest molecules in solution, with molecular masses up to similar to 1500Da followed by the aliphatic and aromatic components. Amino acids with a range of molecular weights were also identified in the mixture. The summation of the individual slices from the DOSY experiment closely resembles the conventional H-1 spectra of the material, indicating that the components identified with DOSY represent all the components present in the mixture. The separation of components in the mixture in organic solvent supports new findings that fulvic and humic acids are not cross-linked, high molecular weight macromolecules but are instead aggregates composed of relatively simple molecules that take on colloidal properties in the presence of metal ions in aqueous solution. Using the knowledge that these organic mixtures are combinations of relatively simple entities with well-documented reactivities and behavior will improve our ability to predict and model their interactions and fate under natural conditions.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/12/20 alle ore 19:24:35