Determination of hexenuronic acid and residual lignin in pulps by UV spectroscopy in cadoxen solutions

resumo

A new method for the simultaneous determination of hexenuronic acid (HexA) and residual lignin in kraft pulps by UV spectroscopy in cadoxen solutions is proposed. Unbleached or partially bleached hardwood or softwood pulps soluble in cadoxen can be analyzed. The HexA content determined by this new method is about 5% higher that obtained by the conventional acid hydrolysis technique. The residual lignin concentrations in the pulps afforded by this approach are lower than those determined without taking into account the presence of HexA. The advantages and limitations of the method are discussed.

palavras-chave

PINE KRAFT PULP; NMR-SPECTROSCOPY; XYLAN; HYDROLYSIS; WOOD; ECF

categoria

Materials Science

autores

Evtuguin, DV; Daniel, AID; Neto, CP

nossos autores

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