✦ LIBER ✦
Oxalic acid extraction as a posttreatment to increase the brightness of kraft pulps bleached by white-rot fungi
✍ Scribed by M. T. Moreira; G. Feijoo; J. Lema; J. A. Field; R. Sierra-Alvarez
- Publisher
- Springer-Verlag
- Year
- 1996
- Tongue
- English
- Weight
- 379 KB
- Volume
- 10
- Category
- Article
- ISSN
- 0951-208X
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✦ Synopsis
Pulp brightness gains obtained by fungal biobleaching are often decreased by dark MnOZ deposits which are formed by the biologically-mediated oxidation of Mn(I1). Oxalic acid extraction of OZdelignified kraft pulps bleached by several white-rot fungi was found to increase pulp brightness by up to 9.7 IS0 points due to MnO, dissolution. These results indicate that pulp extraction with oxalic acid can be used in order to accurately assess the net brightness gains achieved by fungal biobleaching.