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Norm

ISO 6588-2:2012

Issue date: 2012 10 29

Paper, board and pulps — Determination of pH of aqueous extracts — Part 2: Hot extraction

This part of ISO 6588 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....
Withdrawn: 2020 03 04
Publisher:
International Organization for Standardization
Format:
Digital | 7 Pages
Language:
English
Currently valid:

This part of ISO 6588 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 part of ISO 6588 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 part of ISO 6588 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.

It is necessary to be aware that the results will not be the same when measuring pH according to this part of ISO 6588 when compared to ISO 29681. The differences can be significant especially when measuring pulps having a low ionic strength.

ISO 6588-1 differs from this part of ISO 6588 only as regards the extraction conditions. No general guidance can be given as to which of the two procedures (hot or cold) is best suited in a particular situation.

For cellulosic papers used for electrical purposes, the method used should be that given in IEC 60554-2.

ISO 6588-2:2021
2021 11 23
Paper, board and pulps — Determination of pH of aqueous extracts — Part 2: Hot extraction
Norm
ISO 6588-2:2020
2020 03 04
Paper, board and pulps — Determination of pH of aqueous extracts — Part 2: Hot extraction
Norm
ISO 6588-2:2012
2012 10 29
Paper, board and pulps — Determination of pH of aqueous extracts — Part 2: Hot extraction
Norm
ISO 6588-2:2005
2005 06 02
Paper, board and pulps — Determination of pH of aqueous extracts — Part 2: Hot extraction
Norm
ISO 6588:1981
1981 04 01
Paper, board and pulps — Determination of pH of aqueous extracts
Norm
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Norm
ISO 6588-2:2020
Issue date : 2020 03 04
Paper, board and pulps — Determination of pH of aqueous extracts — Part 2: Hot extraction