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• W2065526959 endingPage "2684" @default.
• W2065526959 startingPage "2680" @default.
• W2065526959 abstract "An improved approach for accurately determining the aromatic carbon fraction (fa) and nonprotonated aromatic carbon fraction (faN) in natural organic matter by solid-state 13C NMR is described. Quantitative peak areas are obtained from direct polarization 13C nuclear magnetic resonance (NMR) under high-speed magic angle spinning (MAS). The problem of overlap between aromatic and alkyl carbon resonances around 90-120 ppm in 13C NMR spectra is solved by a 13C chemical shift anisotropy (CSA) filter technique. After correction for residual spinning sidebands, an accurate value of the aromaticity fa is obtained. To obtain a quantitative faN fraction, dipolar dephasing was adapted for high-speed MAS 13C NMR; the separation of the signals of nonprotonated alkyl and aromatic carbons was achieved by CSA filtering plus dipolar dephasing. The method is demonstrated on a peat humic acid, yielding fa = 45 +/- 2% and faN = (0.64 +/- 0.07) x 45%." @default.
• W2065526959 created "2016-06-24" @default.
• W2065526959 creator A5004494409 @default.
• W2065526959 creator A5080106825 @default.
• W2065526959 date "2004-03-20" @default.
• W2065526959 modified "2023-10-10" @default.
• W2065526959 title "Accurate Quantification of Aromaticity and Nonprotonated Aromatic Carbon Fraction in Natural Organic Matter by ¹³C Solid-State Nuclear Magnetic Resonance" @default.
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• W2065526959 doi "https://doi.org/10.1021/es034770x" @default.
• W2065526959 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/15180065" @default.
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