标准编号：ISO 6588-2:2020
中文名称：纸、纸板和纸浆 水提取物pH值的测定 第2部分：热提取
英文名称：Paper, board and pulps — Determination of pH of aqueous extracts — Part 2: Hot extraction
发布日期：2020-03
标准范围
This document specifies a method for the determination of the pH-value defined by the electrolytes
extractable by hot water from a sample of paper, board or pulp.
This document is applicable to all kinds of paper, board and pulp.
As the quantity of extractable ionic material approaches zero, as in the case of highly purified pulps,
the precision of the method becomes poor because of the difficulties encountered in making pH
measurements on water containing little electrolytic material.
Since the extraction in this document is performed with distilled or deionised water, the pH-value
measured will sometimes be different (e.g. fully bleached pulp) from the pH-value measured under
mill process conditions in which various types of process waters, e.g. chemically treated river water
containing electrolytes, are used. In such cases, ISO 29681 can be used instead, as it is specifically
applicable to bleached pulps from virgin fibres and to pulp samples having a low ionic strength for
which the pH value will give more realistic results related to mill conditions than those obtained with
this document. For cellulosic papers used for electrical purposes, the method used can be that given in
IEC 60554-2 .
立即下载标准文件