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pH of paper

Abstract: 这篇文章探讨了纸张的pH值及其对纸张持久性的影响。pH值反映了纸张的酸碱性，pH值小于7表示纸张酸性，大于7表示碱性，而7为中性。文章介绍了三种测定纸张pH值的方法：通过热蒸馏水和冷蒸馏水提取物测定，以及直接在纸张表面使用湿电极测定。不同方法可能会给出不同的测试结果，从而影响对纸张性质的理解。

pH is an estimate of the concentration of hydrogen ions, so it refers to whether the paper is acidic or basic. pH is equal to the negative logarithm of the hydrogen ion concentration. Paper with a pH less than 7 is acidic; a pH greater than 7 is alkaline, and 7 is neutral. This property is related to the "permanence" of the paper. The pH of paper can be determined in a number of ways, such as:

 (1) Determine the pH of the paper extract obtained by disintegration in hot distilled water.

(2) Measure the pH of the paper extract obtained by disintegrating in cold distilled water.

(3) Measure the pH value directly on the surface of the test paper with a wet electrode. These three modes give different test results on the same paper sample.

pH value of paper with chart 1

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