Elemental quantitation of natural organic matter by CPMAS 13C NMR spectroscopy

被引：46
|
作者：
Conte, P
Piccolo, A
van Lagen, B
Buurman, P
Hemminga, MA
机构：
[1] Univ Naples Federico II, Dipartimento Sci Chim Agr, I-80055 Portici, Italy
[2] Univ Wageningen & Res Ctr, Lab Soil Sci & Geol, NL-6700 AA Wageningen, Netherlands
[3] Univ Wageningen & Res Ctr, Biophys Lab, NL-6700 ET Wageningen, Netherlands
来源：
SOLID STATE NUCLEAR MAGNETIC RESONANCE | 2002年 / 21卷 / 3-4期
关键词：
humic substances; natural organic matter; natural organic compounds; CPMAS-NMR; elemental analysis; quantitation;
D O I：
10.1006/snmr.2002.0057
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Cross-polarized magic-angle-spinning NMR (CPMAS-NMR) techniques are assumed to he only semi-quantitative in the assessment of carbon distribution in humic substances or natural organic matter, due to a number of interferences Such as spinning side bands (SSB) in spectra. paramagnetic species in samples, and low or remote protonation of aromatic carbons. Fast rotor spin rates or direct polarization NMR techniques are normally applied to improve quantitative signal detectability. Variable contact time pulse sequences were used here to obtain CPMAS-NMR spectra of organic compounds of known structure and different humic substances. Integration of spectral areas, previously subtracted of SSB. and relative stoichiometric factors were used for mathematical elaboration to calculate the elemental content in samples. These values did not significantly differ from those obtained by direct determination of elemental content with quantitative elemental analysis. Our results showed that the carbon observed CPMAS-NMR provides a quantitative representation of the whole carbon content in humic substances. (C) 2002 Fisevici Science (USA).
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收藏
页码：158 / 170
页数：13
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