UNLIMITED FREE ACCESS TO THE WORLD'S BEST IDEAS

close
Already an Engineering360 user? Log in.

This is embarrasing...

An error occurred while processing the form. Please try again in a few minutes.

Customize Your Engineering360 Experience

close
Privacy Policy

This is embarrasing...

An error occurred while processing the form. Please try again in a few minutes.

SNZ AS/NZS 1301.422

Method of test for pulp and paper Method 422: Paper, board and pulps – Determination of pH of aqueous extracts – Hot extraction

active, Most Current
Buy Now
Organization: SNZ
Publication Date: 10 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 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[4].

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

Document History

SNZ AS/NZS 1301.422
July 10, 2020
Method of test for pulp and paper Method 422: Paper, board and pulps – Determination of pH of aqueous extracts – Hot extraction
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...
December 31, 2007
Methods of test for pulp and paper Method 422s: Determination of the pH value of aqueous extracts of paper, board and pulp—Hot extraction method
A description is not available for this item.
May 5, 1998
Methods of Test for Pulp and Paper Method 422S: Determination of the pH Value of Aqueous Extracts of Paper, Board and Pulp - Hot 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 - Hot Extraction Method
A description is not available for this item.

References

Advertisement