Abstract
IN the course of certain researches in progress at this Laboratory it became necessary to find a satisfactory method of determining potentiometrically the pH. of the moisture present in wood when the latter is in the air-dry condition, that is, at a moisture content of between approximately 5 and 20 per cent. Most pH determinations in the study of wood are applied to aqueous extracts prepared under standard conditions, and whilst the results so obtained are of value for some purposes, we have found that it is only when a wood exerts a relatively strong buffering action that an extract prepared, for example, by leaching 1 gm. of the powdered substance with 20 ml. of distilled water, can have a pH. approaching closely in numerical value to that of the moisture of condition present in the wood substance prior to extraction.
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CAMPBELL, W., BRYANT, S. Determination of pH in Wood. Nature 147, 357 (1941). https://doi.org/10.1038/147357a0
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DOI: https://doi.org/10.1038/147357a0
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