标准摘要
[中文适用范围]： 本国际标准规定了一种测定纸、纸板及纸浆的盐水提取液pH值的方法，其中浸泡和测量均在盐水（0.1 M KCl溶液）中进行。本国际标准适用于所有种类的纸、纸板及纸浆，但特别适用于来自原生纤维的漂白纸浆以及具有低离子强度的纸浆样品，对于此类样品，使用本国际标准测得的pH值比使用ISO 6588-1或ISO 6588-2测得的值更能反映工厂条件下的实际情况。当使用去离子水且样品具有低离子强度时，悬浮液的离子强度将非常低，测得的pH值将不是样品的pH值，而是蒸馏水的pH值。当在浸泡过程中使用盐水时，纤维壁与周围水之间将不存在浓度差异，测得的pH值即为样品（在纤维壁中）的pH值。在处理具有低离子强度的样品时使用盐水，也有助于获得更稳定和更准确的pH读数。 [外文原描述]： ISO 29681:2009 specifies a method for the determination of the pH of an aqueous extract of paper, board and pulps, in which the soaking and the measuring are performed in salted water (0,1 M KCl solution). ISO 29681:2009 is applicable to all kinds of paper, board and pulps, but is specifically applicable to bleached pulps from virgin fibres and to pulp samples having a low ionic strength for which the pH-value using this International Standard will give more realistic results related to mill conditions than those obtained with ISO 6588-1 or ISO 6588-2.
英文名称Paper, board and pulps — Determination of pH of salted water extracts