Comparison of various structural analyses for pitch fractions

Yamada, Yoshio; Furuta, Takeshi; Sanada, Yuzo

doi:10.1021/ac50005a055

Cited by 9 publications

(1 citation statement)

References 14 publications

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“…In materials derived from coal this is usually presumed to be 0.5, although other factors have been used (Bartle et al, 1979a) and the equation has been modified in various ways to obtain more accurate estimations (Yen and Erdman, 1962;Bartle et al, 1975, 19796;Collin et al, 1980). Alternatives have also been developed (Williams et al, 1978;Yamada et al, 1976). Recently the assumption that x = 0.5 has been shown to be correct for coal derived materials (Retkofsky et al, 1977).…”

Section: Indirect Methodsmentioning

confidence: 99%

Applications of Nuclear Magnetic Resonance Spectroscopy to the Study of the Structure of Soil Organic Matter

Wilson

1981

Journal of Soil Science

134

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Recent developments in the application of nuclear magnetic resonance (n.m.r.) spectroscopy to soil science are reviewed. Progress in 'H. 13C and CP-I3C n.m.r. spectroscopy of humic substances is reported. Methods of determining the fraction of aromatic carbon in soil organic matter extracts are discussed, and methods by which structural group analysis can be carried out on in siru organic matter of whole soils are reviewed. IntroductionNUCLEAR magnetic resonance spectroscopy (n.m.r.) has been an invaluable technique in elucidating the structure of pure and simple mixtures of low molecular weight (approximately less than 2000) organic compounds, but has had limited applicability to the study of complex mixtures.Until about 1970 n.m.r. spectroscopy was an insensitive technique, and spectra from samples of concentration less than 50 mg were determined with difficulty. In complex mixtures such as soil organic matter extracts, the concentrations of individual components are small, and consequently the spectra of organic matter extracts were poor. Over the last ten years, however, Fourier transform n.m.r. techniques have greatly improved spectral quality, and hitherto unobtainable spectra of complex mixtures have been recorded.This paper reviews the literature on the applications of n.m.r. spectroscopy to the study of the structure of soil organic matter, and suggests lines of investigation whereby research should be profitable. Initially I outline some basic n.m.r. principles, then review research to elucidate the structure of extracts of soil organic matter using 'H and I3C n.m.r. techniques and discuss attempts to quantify 13C n.m.r. data. Finally I look at current solid state work which holds promise as a technique for structural group analysis of the in siru organic matter of whole soils.

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Section: Indirect Methodsmentioning

confidence: 99%

Applications of Nuclear Magnetic Resonance Spectroscopy to the Study of the Structure of Soil Organic Matter

Wilson

1981

Journal of Soil Science

134

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Recent advances in the analysis of coal‐derived products

Bartle

Collin

Stadelhofer

et al. 1979

J. Chem. Technol. Biotechnol.

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Recent developments in some of the most important fields of the analytical chemistry of coal and its derivatives are critically reviewed: separation methods; in particular gel-permeation, high-pressure liquid and gas chromatography, 13C-nuclear magnetic resonance spectroscopy, U.V. visible spectrophotometry, fluorimetry and phosphorimetry. Progress in statistical structural analysis, based on both chemical reactions and physical methods, usually n.m.r., is also comprehensively reported.

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