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Titolo:
The application of H-1 HR-MAS NMR spectroscopy for the study of structuresand associations of organic components at the solid - Aqueous interface ofa whole soil
Autore:
Simpson, AJ; Kingery, WL; Shaw, DR; Spraul, M; Humpfer, E; Dvortsak, P;
Indirizzi:
Bruker Analyt GmbH, Silberstreifen, D-76287 Rheinstetten, Germany Bruker Analyt GmbH Rheinstetten Germany D-76287 87 Rheinstetten, Germany Mississippi State Univ, Dept Plant & Soil Sci, Mississippi State, MS 39762USA Mississippi State Univ Mississippi State MS USA 39762 State, MS 39762USA
Titolo Testata:
ENVIRONMENTAL SCIENCE & TECHNOLOGY
fascicolo: 16, volume: 35, anno: 2001,
pagine: 3321 - 3325
SICI:
0013-936X(20010815)35:16<3321:TAOHHN>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
HUMIC SUBSTANCES; BINDING-AFFINITY; FULVIC-ACID; SORPTION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Engineering, Computing & Technology
Citazioni:
22
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., "The application of H-1 HR-MAS NMR spectroscopy for the study of structuresand associations of organic components at the solid - Aqueous interface ofa whole soil", ENV SCI TEC, 35(16), 2001, pp. 3321-3325

Abstract

High resolution-magic angle spinning nuclear magnetic resonance MR-MAS NMR) allows the application of solution state NMR experiments to samples that are not fully soluble and contain solids. Only the species in contact with the solvent system employed become NMR observable. In this study utilizing D2O as the solvent system we show it is possible to examine the structures at the solid-aqueous interface of a whole soil. Combining one- and two-dimensional HR-MAS NMR allowed, for the first time, the identification of fattyacids, aliphatic esters, and ethers/ alcohols as prominent species at the solid-aqueous interface of the soil with signals from sugars and amino acids also apparent. Few, if any signals from aromatic protons were observed when the soil was swollen in aqueous media, although these signals are observed in extracts from the same soil and when the soil is swollen with a more penetrating solvent (DMSO-d(6)) which is known to disassociate hydrogen bonds. These findings indicate that the soil aromatic moieties are protected in hydrophobic regions which are not water accessible. Furthermore, when thesoil was amended with a herbicide (trifluralin), direct observations of interactions between the protons on a xenobiotic and the surrounding soil matrix were possible for the first time. HR-MAS promises to be a method that can be widely applicable to a range of complex environmental samples withoutthe need for extraction, pretreatment, or purification.

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Documento generato il 01/12/20 alle ore 12:58:28