Comparison of soil organic carbon speciation using C NEXAFS and CPMAS 13C NMR spectroscopy
نویسندگان
چکیده
منابع مشابه
Elemental quantitation of natural organic matter by CPMAS 13C NMR spectroscopy.
Cross-polarized magic-angle-spinning NMR (CPMAS-NMR) techniques are assumed to be 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 polarizat...
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fication processes (Solomon et al., 2002). Soil organic matter is a complex material consisting of plant biopolySoil organic matter (SOM) is a fundamental component of soil mers (e.g., polysaccharides, lignin, proteins, and cuticuand the global C cycle. We used C (1s) near-edge x-ray absorption fine structure (NEXAFS) and synchrotron-based Fourier transform lar materials), animal and microbial ...
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The U.S. National Institute of Standards and Technology (NIST) provides a number of particulate matter (PM) standard reference materials (SRM) for use in environmental and toxicological methodology and research. We present here the first analysis with respect to the molecular structure of the carbon in three such NIST SRM samples, i.e., diesel engine exhaust soot from heavy duty equipment engin...
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I. MORIER , P. SCHLEPPI , R. SIEGWOLF , H. KNICKER & C. GUENAT Swiss Federal Institute of Technology (EPFL), ISTE Institute, ECOS-WSL, Station 2, GR, CH-1015, Lausanne, Switzerland, Swiss Federal Institute for Forest, Snow and Landscape Research (WSL), Forest Ecosystem Process Unit, CH-8903, Birmensdorf, Switzerland, Paul Scherrer Institut (PSI), Laboratory of Atmospheric Chemistry, CH-5332, Vi...
متن کاملAdvanced CPMAS-13C NMR techniques for molecular characterization of size-separated fractions from a soil humic acid.
A humic acid extracted from a volcanic soil was subjected to preparative high-performance size-exclusion chromatography (HPSEC) to reduce its molecular complexity and eleven different size fractions were obtained. Cross-polarization magic-angle spinning 13C NMR (CPMAS 13C NMR) analysis performed with variable contact-time (VCT) pulse sequences showed that the largest molecular-size fractions co...
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ژورنال
عنوان ژورنال: Science of The Total Environment
سال: 2018
ISSN: 0048-9697
DOI: 10.1016/j.scitotenv.2018.02.121