Abstract
A direct method of measuring the pH value of wood substance is proposed in the paper. The achieved results were completed by determining the pH value on the wood surface using the contact method. Moreover, the results were compared to the results achieved using the indirect methods to determine the pH value in cold water, as well as hot water, extract of wood. Using the direct method for measuring the pH value in drilled fresh sawdust, the pH value of beech was 5.11, of birch was 5.29, of alder was 4.88, and of maple was 4.65. Following the achieved results, the possibility to measure the pH value using a fast, accurate method useful in practice complying with the condition of the minimum free water in wood (moisture content of wood above the fibre saturation point) was presented. The results of measurements of the pH value using the contact method on the wood surface showed that this method can be used in the case of coniferous as well as broadleaved trees with heartwood. The value of pH measured on the surface of pine was 4.50, of spruce was 4.79, of the heartwood of oak was 3.46, and of the sapwood of oak 5.04. The measurement of pH values of water extracts confirmed great dependence of measured values on the conditions of wood extraction.
Highlights
The pH value is a measure of the concentration of H+ ions in a solution and it is used to determine acidic, neutral, or base behaviour [1].pH values are very important physiological parameter for plants, humans, and animals.The measurement of the pH value is used in almost every laboratory, manufacturing plant, or field-work [2].All wood species have a pH and most species are naturally acidic, with the vast majority having a pH between 4.0 and 5.5
The aim of the paper was to verify the possibility of determining the pH value using the contact method on the wood surface, to propose a fast and easy to be applied method in practice for measuring the pH value of wood substance at the different moisture content
Results and Discussion ethanol-toluene solvent (TEE), holocellulose, cellulose, and lignin content was conducted in order
Summary
The pH value is a measure of the concentration of H+ ions in a solution and it is used to determine acidic, neutral, or base behaviour [1].pH values are very important physiological parameter for plants, humans, and animals.The measurement of the pH value is used in almost every laboratory, manufacturing plant, or field-work [2].All wood species have a pH and most species are naturally acidic, with the vast majority having a pH between 4.0 and 5.5. The pH value is a measure of the concentration of H+ ions in a solution and it is used to determine acidic, neutral, or base behaviour [1]. PH values are very important physiological parameter for plants, humans, and animals. The measurement of the pH value is used in almost every laboratory, manufacturing plant, or field-work [2]. The values of pH of various tree species of temperate zone range from 3.3 to. Tropical tree species are of a weak acid or a weak base ranging from 3.7 to 8.2. There are examples of strongly acidic species like Douglas fir, with the pH value of 3.3, and alkaline species such as African tree species There are examples of strongly acidic species like Douglas fir, with the pH value of 3.3, and alkaline species such as African tree species (Dalbergia melanoxylon Guill.; Terminalia superba Engl. & Diels), with the pH value of 8.0 and 8.2 [3,4,5,6]
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