Characterization of Soil Organic Matter in Aggregates and Size-Density Fractions by Solid State13C CPMAS 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...
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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The composition of isolated natural organic matter (NOM) fractions was studied by means of high pressure size-exclusion chromatography (HP-SEC), specific ultraviolet absorbance (SUVA) at 254 nm, total luminescence spectroscopy (TLS) and synchronous scanning fluorescence measurements. The HPSEC, SUVA and TLS studies revealed that humic acids (HA) and hydrophobic acids (HOA) are composed of compl...
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In a partly urbanized catchment to the south of Trier, Germany, selected sediment samples were separated into different size fractions ranging from <2 urn to 200 urn. Each sample fraction was analysed for heavy metals, poly chlorinated biphenyls (PCB), poly cyclic aromatic hydrocarbons (PAH) and organic carbon. The results show a linear correlation between heavy metal content and particle size....
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The family of poly(aryletherketone) or PAEK polymers are of great interest for extreme service environments in the oil and gas industry. These materials (PEEK’s, PEK’s, PEKEKK’s etc) are often used in environments of high pressures and temperatures, while being exposed to steam, water based drilling fluids or brines, or other corrosive chemical cocktails that are highly acidic, oxidizing or cau...
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ژورنال
عنوان ژورنال: Communications in Soil Science and Plant Analysis
سال: 2014
ISSN: 0010-3624,1532-2416
DOI: 10.1080/00103624.2014.904335