Clear effects of soil organic matter chemistry, as determined by NMR spectroscopy, on the sorption of diuron.

Clear effects of soil organic matter chemistry, as determined by NMR spectroscopy, on the sorption of diuron. Research Abstract Details 

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Clear effects of soil organic matter chemistry, as determined by NMR spectroscopy, on the sorption of diuron. Abstract Text:

Ahmad Gholamalizadeh Ahangar,Ronald J Smernik,Rai S Kookana,David J Chittleborough,

Organic matter has long been recognized as the main sorbent phase in soils for hydrophobic organic compounds (HOCs). In recent times, there has been an increasing realization that not only the amount, but also the chemical composition, of organic matter can influence the sorption properties of a soil. Here, we show that the organic carbon-normalized sorption coefficient (K(OC)) for diuron is 27-81% higher in 10 A11 horizons than in 10 matching A12 horizons for soils collected from a small (2ha) field. K(OC) was generally greater for the deeper (B) horizons, although these values may be inflated by sorption of diuron to clays. Organic matter chemistry of the A11 and A12 horizons was determined using solid-state (13)C nuclear magnetic resonance (NMR) spectroscopy. K(OC) was positively correlated with aryl C (r(2)=0.59, significance level 0.001) and negatively correlated with O-alkyl C (r(2)=0.84, significance level <0.001). This is only the second report of correlations between whole soil K(OC) and NMR-derived measures of organic matter chemistry. We suggest that this success may be a consequence of limiting this study to a very small area (a single field). There is growing evidence that interactions between organic matter and clay minerals strongly affect K(OC). However, because the soil mineralogy varies little across the field, the influence of these interactions is greatly diminished, allowing the effect of organic matter chemistry on K(OC) to be seen clearly. This study in some way reconciles studies that show strong correlations between K(OC) and the chemistry of purified organic materials and the general lack of such correlations for whole soils.

Clear effects of soil organic matter chemistry, as determined by NMR spectroscopy, on the sorption of diuron. Publishing Authors By Initials

AG Ahangar,RJ Smernik,RS Kookana,DJ Chittleborough,

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Clear effects of soil organic matter chemistry, as determined by NMR spectroscopy, on the sorption of diuron. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Chemosphere

VOLUME: 70

Page Numbers: 1153-60

Journal Abbreviation: Chemosphere

ISSN: 0045-6535

DAY: 4

MONTH: 10

YEAR: 2007

Clear effects of soil organic matter chemistry, as determined by NMR spectroscopy, on the sorption of diuron. Information

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LANGUAGE: eng

NlmUniqueID: 320657

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AFFILIATION: Soil and Land Systems, School of Earth and Environmental Sciences, The University of Adelaide, Waite Campus, Urrbrae, South Australia 5064, Australia; Department of Soil Science, College of Agriculture, University of Zabol, Zabol, Iran.

Country: England

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MEDLINETA: Chemosphere

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