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Kinetics of Eucalypt Lignosulfonate Oxidation to Aromatic Aldehydes by Oxygen i...
Santos, Sonia G.; Marques, Ana P.; Lima, Diana L. D.; Evtuguin, Dmitry V.; Esteves, Valdemar I.The oxidation kinetics of lignosulfonates (LS) from acidic magnesium-based sulfite pulping of Eucalyptus globulus wood with oxygen under alkaline conditions was studied. The analysis of oxidation products in the reaction system O(2)/NaOH revealed a predominance of aromatic aldehydes (vanillin and syringic aldehyde) though small amounts of vanillic and syringic acids and acetophenone/phenylacetaldehyde derivativ...
Study of the effect of pH, salinity and DOC on fluorescence of synthetic mixtur...
Esteves, Valdemar I.; Santos, Eduarda B. H.; Duarte, Armando C.In order to provide support for the discussion of the fate of organic matter in estuaries, a laboratory simulation was performed by changing freshwater ionic strength, pH and organic matter content. The change in spectroscopic characteristics caused by variations in salinity, pH and organic matter concentration in the filtered samples was observed by UV-Vis and fluorescence spectroscopy. The increase in emissio...
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