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Details van artikel 5 van 8 gevonden artikelen
| Titel: |
Fluorescent Detection of o-Quinones Formed in Lignin-Containing Pulps During Irradiation |
| Auteur: |
Zhu, Jian H. Olmstead, Jennifer A. Gray, Derek G. |
| Verschenen in: |
Journal of wood chemistry and technology |
| Paginering: | Jaargang 15 (1995) nr. 1 pagina's 43-64 |
| Jaar: |
1995-02-01 |
| Inhoud: |
o-Quinones are thought to play a key role in the photoyellowing of mechanical pulps. The facile reaction between o-quinones and o-phenylenediamine to give fluorescent phenazines is examined as a possible way to detect quinonoid intermediates in pulp sheets. The method was tested on o-quinone-rich mechanical pulp sheets prepared by chemical treatment with Fremy's salt (potassium nitrosodisulphonate). The presence of photochemically generated o-quinone groups in peroxide-bleached mechanical pulps was inferred from the fluorescence observed from o-phenylenediamine treated sheets. This fluorescence increased with increasing radiation time up to a limiting value. The quinones (but not their phenazine derivatives) are stable upon storage in the dark. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 5 van 8 gevonden artikelen
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