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SNZ AS/NZS 1301.421

Method of test for pulp and paper Method 421: Paper, board and pulps – Determination of pH of aqueous extracts – Cold extraction

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Organization: SNZ
Publication Date: 1 July 2020
Status: active
Page Count: 17
scope:

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].

[4] IEC 60554-2, Cellulosic papers for electrical purposes - Part 2: Methods of test

Document History

SNZ AS/NZS 1301.421
July 1, 2020
Method of test for pulp and paper Method 421: Paper, board and pulps – Determination of pH of aqueous extracts – Cold extraction
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...
December 11, 2008
Methods of test for pulp and paper Method 421: Determination of pH of aqueous extracts—Cold extraction method
A description is not available for this item.
June 5, 1998
Methods of Test for Pulp and Paper Method 421S: Determination of the pH Value of Aqueous Extracts of Paper, Board and Pulp - Cold Extraction Method
A description is not available for this item.
January 1, 1991
Determination of the pH Value of Aqueous Extracts of Paper, Board and Pulp - Cold Extraction Method
A description is not available for this item.

References

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