ISO 29681:2009 PDF

Paper, board and pulps — Determination of pH of salted water extracts

Название (английский):

ISO 29681:2009

Paper, board and pulps — Determination of pH of salted water extracts

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 8
Дата публикации:: 8 декабря 2009 г.
Издание:: ISO IS 29681 edition 1 version 1
ICS:: 85.040

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Описание (английский):

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.

Технические детали

Технический комитет: ISO/TC 6 - Paper, board and pulps
SKU: ISO 29681:2009

Abstract

Overview

ISO 29681:2009 specifies a standardized method for the determination of pH of salted water extracts of paper, board and pulps. The method uses a 0.100 M KCl (salted water) extract to reduce Donnan ion‑exchange effects and provide pH values that better reflect real mill/process conditions-especially for bleached pulps from virgin fibres and other samples with low ionic strength. Results can differ notably from those obtained with ISO 6588-1 / ISO 6588-2.

Key topics and technical requirements

Salted water: potassium chloride solution c(KCl) = 0.100 M (7.45 g KCl per 1 000 ml).
Test portion: air-dry, cut to small pieces; weigh 2.0–2.2 g into a flask.
Extraction/soaking: add 100 ml salted water and soak 1 hour; soak at 20–25 °C (cold) or (90 ± 5) °C (hot), shaking at least once during the period.
Filtration: filter the suspension (fritted glass or low-ash filter paper) before measurement.
pH measurement:
- Calibrate pH-meter with at least two buffer solutions (e.g. pH ≈ 4, 7, 9) at 20–25 °C.
- Measurement at 20–25 °C; electrode system must allow measurement error

Overview

Key topics and technical requirements

Salted water: potassium chloride solution c(KCl) = 0.100 M (7.45 g KCl per 1 000 ml).
Test portion: air-dry, cut to small pieces; weigh 2.0–2.2 g into a flask.
Extraction/soaking: add 100 ml salted water and soak 1 hour; soak at 20–25 °C (cold) or (90 ± 5) °C (hot), shaking at least once during the period.
Filtration: filter the suspension (fritted glass or low-ash filter paper) before measurement.
pH measurement:
- Calibrate pH-meter with at least two buffer solutions (e.g. pH ≈ 4, 7, 9) at 20–25 °C.
- Measurement at 20–25 °C; electrode system must allow measurement error

ISO 29681:2009 PDF

Технические детали

Abstract

Overview

Key topics and technical requirements

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Abstract

Overview

Key topics and technical requirements

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