ISO 6588-1:2020 纸、纸板和纸浆 水提取物pH值的测定 第1部分：冷提取

标准编号：ISO 6588-1:2020

中文名称：纸、纸板和纸浆 水提取物pH值的测定 第1部分：冷提取

英文名称：Paper, board and pulps — Determination of pH of aqueous extracts — Part 1: Cold extraction

发布日期：2020-02

标准范围

本文件规定了用冷水从纸、纸板或纸浆样品中提取的电解质的pH值测定方法。本文件适用于所有类型的纸、纸板和纸浆。当可提取离子物质的数量接近于零时，如在高纯度纸浆的情况下，该方法的精度变得很差，因为在含有少量电解物质的水上进行pH测量时遇到困难。由于本文件中的萃取是用蒸馏水或去离子水进行的，因此测得的pH值有时会与在工厂工艺条件下测得的pH值不同（例如，对于完全漂白的纸浆而言），在工厂工艺条件下，各种类型的工艺水，例如:。g、 使用含有电解质的化学处理河水。在这种情况下，应改用ISO 29681，因为它特别适用于来自未经处理纤维的漂白纸浆和具有较低离子强度的纸浆样品，与本文件获得的结果相比，pH值将给出与研磨条件有关的更现实的结果。对于用于电气目的的纤维素纸，使用的方法应符合IEC 60554-2的规定。

This document specifies a method for the determination of the pH-value defined by the electrolytes extractable by cold water from a sample of paper, board or pulp.This document is applicable to all types 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. for 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 should 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 should be that given in IEC 60554？2^[4].

标准预览图