0000000000793626

AUTHOR

Pekka Mannila

showing 2 related works from this author

NMR Study of Kraft Pulp Mill Waste and Natural Humic Substances

1988

High field proton NMR spectroscopy in DMSO-d6 solution is applied for structural analysis of main high molecular fractions of natural humus and waste lignin from kraft pulp mill. The spectra are similar in great part. Main differences appear in p-disubstituted benzene proton and -CH2 -CO-proton signals which are absent in spectrum of waste lignin obviously due to chlorination. A new observation of 51 Hz 1:1:1 triplet in both spectra is discussed.

Proton nmr spectroscopychemistry.chemical_compoundchemistryWaste managementKraft processPulp bleachingLigninHigh fieldPulp and paper industryBenzeneHumus
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Chemical characterization of peat fulvic acid fractions

1993

Abstract Milled peat fulvic acid (FA) preparation was fractionated by XAD-8 and conventional extraction methods. The fractions were further analyzed by IR and NMR and subjected to cupric oxide (CuO) oxidation. Carbohydrates of polydisperse FA were mostly not retained in the XAD-8 fractionation. The intensity of the signals due to double bonded carbons was much greater in the 13 C and proton NMR spectrum of the XAD-8 retained fraction than in the spectra of the XAD-8 non-retained or XAD-8 non-treated fractions. In CuO oxidation the main products of all FA fractions were 4-hydroxybenzaldehyde and 4-hydroxyacetophenone, both indicators of 4-hydroxyphenylpropane building blocks. Their concentra…

chemistry.chemical_classificationDegree of unsaturationEnvironmental EngineeringDouble bondChemistryHealth Toxicology and MutagenesisPublic Health Environmental and Occupational HealthAnalytical chemistryInfrared spectroscopyAromaticityFraction (chemistry)General MedicineGeneral ChemistryFractionationPollutionNMR spectra databaseProton NMREnvironmental ChemistryNuclear chemistryChemosphere
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