BS ISO 29681:2009
Current
The latest, up-to-date edition.
Paper, board and pulps. Determination of pH of salted water extracts
Hardcopy , PDF
English
31-03-2010
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents
6 Apparatus and equipment
7 Sampling and preparation of sample
8 Procedure
9 Calculation
10 Precision
11 Test report
Annex A (informative) - Preparation of standard buffer
solutions
Annex B (informative) - Comparison of results between
ISO 29681 and ISO 6588-1 and ISO 6588-2
Bibliography
Describes a method for the determination of the pH of an aqueous extract of paper, board and pulps, in which the soaking and the measuring are performed in salted water (0,1 M KCl solution).
| Committee |
PAI/11
|
| DevelopmentNote |
Supersedes 08/30190670 DC. (03/2010) Reviewed and confirmed by BSI, May 2015. (05/2015)
|
| DocumentType |
Standard
|
| Pages |
20
|
| PublisherName |
British Standards Institution
|
| Status |
Current
|
| Supersedes |
This International Standard specifies a method for the determination of the pH of an aqueous extract of paper, board and pulps, in which the soaking and the measuring are performed in salted water (0,1M KCl solution).
This International Standard is applicable to all kinds of paper, board and pulps, but is specifically applicable to bleached pulps from virgin fibres and to pulp samples having a low ionic strength for which the pH-value using this International Standard will give more realistic results related to mill conditions than those obtained with ISO6588-1 or ISO6588-2.
When deionized water is used and the sample has a low ionic strength, the suspension will have a very low ionic strength and the pH-value obtained in the measurement will not be that of the sample but that of the distilled water. When salted water is used in the soaking, there will be no concentration difference between the fibre wall and the surrounding water, and the pH-value measured will be that of the sample (in the fibre wall).
The use of salted water when dealing with samples having a low ionic strength also promotes more stable and more accurate pH-readings.
| Standards | Relationship |
| ISO 29681:2009 | Identical |
| ISO 6588-1:2012 | Paper, board and pulps Determination of pH of aqueous extracts Part 1: Cold extraction |
| ISO 6588-2:2012 | Paper, board and pulps Determination of pH of aqueous extracts Part 2: Hot extraction |
| ISO 186:2002 | Paper and board — Sampling to determine average quality |
| ISO 7213:1981 | Pulps Sampling for testing |
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