Summary
A new technique suitable for determination of lignin distribution in hardwoods has been developed. The technique is based on the mercurization of the aromatic nucleus of the lignin and a concomitant determination of the mercury content by the SEM- or TEM-EDXA technique. An incorporation of one mole mercury per mole lignin (C9-unit) was obtained for the birch lignin. The concentration of lignin was found to be about 3 times higher in the cell corners of the middle lamella than in the secondary wall of the birch fibers. The cell wall of the vessels and the ray cells were almost equal in lignin concentration and had about 1.5–1.6 times higher concentration than the secondary wall of the fibers. No specific mass loss of the organically bound mercury during the electron beam bombardment was found under the conditions used in this work.
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Eriksson, I., Lidbrandt, O. & Westermark, U. Lignin distribution in birch (Betula verrucosa) as determined by mercurization with SEM- and TEM-EDXA. Wood Sci.Technol. 22, 251–257 (1988). https://doi.org/10.1007/BF00386020
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DOI: https://doi.org/10.1007/BF00386020