Cation Exchange Capacity Tests on Some Lignocellulosic Materials Highlight Some Aspects of the Use of Copper as Wood Preservative
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Giuseppe Staccioli
Summary
The stoichiometric validity of copper(II) salts in the assessing the cation exchange capacity of lignocellulosic materials with respect to sodium salts is determined on some materials like Populus euramericana, Pinus pinea, flax, hemp, cotton, and some of their derivatives.
Copper exhibits the usual stoichiometry (bivalence) with saponified woods and Norman & Jenkins holocelluloses whereas it is present as bivalent and/or apparent monovalent ions in the other materials. The major groups responsible for cation exchange are the carboxyls of polyoses while hydroxyls seem inert at this reaction. Cation exchange of wood and raw fibers is, on the contrary, influenced by the structure of lignin. In fact, when it forms ester bonds with polyoses it causes the rising of copper apparently working as monovalent species. Lacking these bonds, lignin does not provoke any chemical interactions except for some isolated lignins. These data show that copper interacts mainly with polyoses, secondly with lignin if bonded to polyoses whereas cellulose seems to be weakly involved in these interactions.
To improve the assumption of copper from preservative formulations mild saponification of woods is suggested since such treatment enhances the number of sites of exchange in polyoses.
Copyright © 2000 by Walter de Gruyter GmbH & Co. KG
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- A Comparative Study on Reactions of Hydrogen Peroxide and Peracetic Acid with Lignin Chromophores. Part 1. The Reaction of Coniferaldehyde Model Compounds
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- Determination of Residual Stresses in Medium Density Fibreboard
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- Study of the System Wood – Coating Material. I. Wood – Liquid Coating Material
- Effect of Lignocellulosic Materials on the Properties of Thermoplastic Polymer/Wood Composites
- A New Air Dehydration Process for Wood Dryers. Part I. Kinetic and Quality of Drying
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- Literature Reports
Articles in the same Issue
- Modelling the Moisture Induced Risk of Decay for Treated and Untreated Wood Above Ground
- FTIR Characterization of Copper Ethanolamine—Wood Interaction for Wood Preservation
- Glycerol/Glyoxal: A New Boron Fixation System for Wood Preservation and Dimensional Stabilization
- Removal of Phenolic Hydroxyl Groups in Lignin Model Compounds and Its Effect on Photostability
- Cation Exchange Capacity Tests on Some Lignocellulosic Materials Highlight Some Aspects of the Use of Copper as Wood Preservative
- Biological, Chemical and Mechanical Characteristics of "Wulstholz" as a Response to Mechanical Stress in Living Trees of Picea abies [L.] Karst
- A Comparative Study on Reactions of Hydrogen Peroxide and Peracetic Acid with Lignin Chromophores. Part 1. The Reaction of Coniferaldehyde Model Compounds
- A Comparative Study on Reactions of Hydrogen Peroxide and Peracetic Acid with Lignin Chromophores. Part 2. The Reaction of Stilbene-Type Model Compounds
- Chlorinated Phenolic Compounds in Bleaching Filtrates from a Mixed Eucalyptus and Acacia Pulp Using Different Sequences
- Kinetic Studies on Oxidation of Veratryl Alcohol by Laccase-Mediator System. Part 1. Effects of Mediator Concentration
- Kinetic Studies on Oxidation of Veratryl Alcohol by Laccase-Mediator System. Part 2. The Kinetics of Dioxygen Uptake
- Determination of Residual Stresses in Medium Density Fibreboard
- Dynamics of Hardwood Impregnation
- Study of the System Wood – Coating Material. I. Wood – Liquid Coating Material
- Effect of Lignocellulosic Materials on the Properties of Thermoplastic Polymer/Wood Composites
- A New Air Dehydration Process for Wood Dryers. Part I. Kinetic and Quality of Drying
- A New Air Dehydration Process for Wood Dryers. Part II. Elimination of Organic Compounds
- A New Method of Sample Preparation for Kenaf Bast Fiber Length Analysis with Automated Fiber Length Analyzer
- Literature Reports
