Reference number
ISO 29681:2009
ISO 29681:2009
© ISO 2025
International Standard
ISO 29681:2009
Paper, board and pulps — Determination of pH of salted water extracts
Edition 1
2009-12
2009-12
ISO 29681:2009
42776
Published
(Edition 1, 2009)
This publication was last reviewed and confirmed in 2020.
Therefore this version remains current.
Abstract
ISO 29681:2009 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 (0,1 M KCl solution).
ISO 29681:2009 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 ISO 6588-1 or ISO 6588-2.