SIST ISO 6588-1:2013
Paper, board and pulps -- Determination of pH of aqueous extracts -- Part 1: Cold extraction
Paper, board and pulps -- Determination of pH of aqueous extracts -- Part 1: Cold extraction
This part of ISO 6588 specifies a method for the determination of the pH-value defined by the electrolytes extractable by cold water from a sample of paper, board or pulp. This part of ISO 6588 is applicable to all types 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. for 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 and to ISO 29681 - Paper, board and pulps - Determination of pH of salted water. The difference can be significant especially when measuring pulps having a low ionic strength. ISO 6588-2 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 (see in the Bibliography.
Papier, carton et pâtes -- Détermination du pH des extraits aqueux -- Partie 1: Extraction à froid
L'ISO 6588-1:2012 sp�cifie une m�thode pour la d�termination du pH d�fini par les �lectrolytes extractibles d'un �chantillon de papier, de carton ou de p�te, par de l'eau froide.
L'ISO 6588-1:2012 est applicable � tous les types de papiers, de cartons et de p�tes.
Lorsque la quantit� de substance ionique extractible est presque nulle, comme dans le cas des p�tes hautement purifi�es, la fid�lit� de la m�thode devient mauvaise en raison des difficult�s rencontr�es lors de la r�alisation des mesurages de pH d'une eau contenant peu de substances �lectrolytiques.
Puisque, dans l'ISO 6588-1:2012, l'extraction est effectu�e avec de l'eau distill�e ou d�ionis�e, le pH mesur� est parfois diff�rent (par exemple pour une p�te hautement blanchie) de celui mesur� dans les conditions mises en oeuvre pendant le proc�d� industriel lors duquel diff�rents types d'eaux de proc�d� sont utilis�s, par exemple de l'eau de rivi�re trait�e chimiquement contenant des �lectrolytes.
Il est n�cessaire d'avoir conscience du fait que les r�sultats obtenus en mesurant le pH conform�ment � l'ISO 6588-1:2012 seront diff�rents de ceux obtenus � l'aide de l'ISO 29681. Ces diff�rences peuvent �tre significatives, notamment lors d'un mesurage sur des p�tes de faible concentration ionique.
L'ISO 6588-2 ne diff�re de l'ISO 6588-1:2012 qu'au sujet des conditions d'extraction. Aucune ligne directrice g�n�rale ne peut �tre donn�e concernant le mode op�ratoire le plus adapt� (extraction � chaud ou � froid) en fonction d'une situation donn�e.
Pour les papiers cellulosiques � usages �lectriques, il est recommand� d'utiliser la m�thode indiqu�e dans la CEI 60554-2.
Papir, karton, lepenka in vlaknine - Določanje vrednosti pH vodnih ekstraktov - 1. del: Ekstrakcija v hladnem
Ta del standarda ISO 6588 opisuje metodo za določanje vrednosti pH na podlagi elektrolitov, ki jih je mogoče v hladni vodi ekstrahirati iz vzorca papirja, kartona, lepenke ali vlaknin. Ta del standarda ISO 6588 se uporablja za vse vrste papirja, kartona, lepenke in vlaknin. Metoda je manj natančna, če je količina ionskih snovi, ki jih je mogoče ekstrahirati, zanemarljiva (npr. v primeru zelo prečiščenih vlaknin), ker se pri merjenju vrednosti pH vode, ki vsebuje majhne količine elektrolitov, pojavljajo težave. Ker se ekstrakcija iz tega dela standarda ISO 6588 izvaja z destilirano ali deionizirano vodo, se lahko izmerjena vrednost pH v nekaterih primerih (npr. pri popolnoma pobeljenih vlakninah) razlikuje od vrednosti pH, izmerjene pod pogoji postopkov v papirnici, pri katerih se uporabljajo različne tehnološke vode, npr. kemično obdelana rečna voda, ki vsebuje elektrolite. Upoštevati je treba, da se rezultati merjenja vrednosti pH v skladu s tem delom standarda ISO 6588 razlikujejo od rezultatov, pridobljenih v skladu s standardom ISO 29681 – Papir, karton, lepenka in vlaknine – Določanje vrednosti pH slane vode. Razlike so lahko velike zlasti pri merjenju vlaknin z nizko ionsko močjo. Standard ISO 6588-2 se od tega dela standarda ISO 6588 razlikuje samo glede pogojev ekstrakcije. V standardu niso navedeni splošni napotki o tem, kateri postopek (v hladnem ali v vročem) je primernejši v posameznem primeru. Za celulozni papir za elektrotehnične namene se uporablja metoda iz standarda IEC 60554-2 (glej bibliografijo).
General Information
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Buy Standard
Standards Content (Sample)
SLOVENSKI STANDARD
SIST ISO 6588-1:2013
01-marec-2013
1DGRPHãþD
SIST ISO 6588-1:2011
3DSLUNDUWRQOHSHQNDLQYODNQLQH'RORþDQMHYUHGQRVWLS+YRGQLKHNVWUDNWRY
GHO (NVWUDNFLMDYKODGQHP
Paper, board and pulps -- Determination of pH of aqueous extracts -- Part 1: Cold
extraction
Papier, carton et pâtes -- Détermination du pH des extraits aqueux -- Partie 1: Extraction
à froid
Ta slovenski standard je istoveten z: ISO 6588-1:2012
ICS:
85.040 Vlaknine Pulps
85.060 Papir, karton in lepenka Paper and board
SIST ISO 6588-1:2013 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
SIST ISO 6588-1:2013
---------------------- Page: 2 ----------------------
SIST ISO 6588-1:2013
INTERNATIONAL ISO
STANDARD 6588-1
Second edition
2012-11-01
Paper, board and pulps —
Determination of pH of aqueous
extracts —
Part 1:
Cold extraction
Papier, carton et pâtes — Détermination du pH des extraits aqueux —
Partie 1: Extraction à froid
Reference number
ISO 6588-1:2012(E)
©
ISO 2012
---------------------- Page: 3 ----------------------
SIST ISO 6588-1:2013
ISO 6588-1:2012(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2012
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any
means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the
address below or ISO’s member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2012 – All rights reserved
---------------------- Page: 4 ----------------------
SIST ISO 6588-1:2013
ISO 6588-1:2012(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Principle . 1
4 Reagents . 2
5 Apparatus and equipment . 2
6 Sampling and preparation of sample . 2
6.1 Sampling . 2
6.2 Preparation of sample. 2
7 Procedure. 2
7.1 Weighing . 3
7.2 Extraction . 3
7.3 Determination of pH . 3
8 Calculation . 3
9 Test report . 3
Annex A (informative) Preparation of some standard buffer solutions . 5
Annex B (informative) Precision . 6
Bibliography . 8
© ISO 2012 – All rights reserved iii
---------------------- Page: 5 ----------------------
SIST ISO 6588-1:2013
ISO 6588-1:2012(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International
Standards adopted by the technical committees are circulated to the member bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the member bodies
casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 6588-1 was prepared by Technical Committee ISO/TC 6, Paper, board and pulps.
This second edition cancels and replaces the first edition (ISO 6588-1:2005), which has been technically
revised. The major difference compared with the previous edition is the addition of a paragraph in the
[5]
scope to differentiate the results obtained with this standard from those obtained using ISO 29681 .
ISO 6588 consists of the following parts, under the general title Paper, board and pulps — Determination
of pH of aqueous extracts:
— Part 1: Cold extraction
— Part 2: Hot extraction
iv © ISO 2012 – All rights reserved
---------------------- Page: 6 ----------------------
SIST ISO 6588-1:2013
ISO 6588-1:2012(E)
Introduction
Kraft fibre is well known to contain ionisable groups that are fixed to or in the fibre wall. In order to fulfil
the electro-neutrality, these groups are balanced by an equivalent number of positive charges, which
can be either protons or various metal ions. Especially in pulp suspensions at low ionic strengths, this
can give rise to a marked uneven distribution of mobile ions between the volume held by the fibre wall
and the bulk suspension liquor. This means that the fibre acts as an ion exchanger. These ion-exchange
[2, 3]
phenomena can be modelled very well with the Donnan theory .
If a relatively clean pulp fibre sample, for example bleached dried pulp, is diluted in deionised water,
the result will be a pulp suspension with a very low ionic strength. In such a system, most of the cations
present, including protons, will be concentrated in the water volume held by the fibre wall. If the pH
is measured, it will be measured in the bulk suspension liquor. By adding salt to this kind of system,
the ion exchange phenomena will be decreased, and the concentration of different cations will be the
same in the water held by the fibre wall and in the bulk suspension liquor. Since the process waters
always contain a certain amount of ions, such a salt addition will give a more realistic environment when
measuring the pH of relatively clean pulp samples.
It is necessary to be aware of these effects when interpreting the measured pH-values of highly
purified pulps.
© ISO 2012 – All rights reserved v
---------------------- Page: 7 ----------------------
SIST ISO 6588-1:2013
---------------------- Page: 8 ----------------------
SIST ISO 6588-1:2013
INTERNATIONAL STANDARD ISO 6588-1:2012(E)
Paper, board and pulps — Determination of pH of
aqueous extracts —
Part 1:
Cold extraction
1 Scope
This part of ISO 6588 specifies a method for the determination of the pH-value defined by the electrolytes
extractable by cold water from a sample of paper, board or pulp.
This part of ISO 6588 is applicable to all types 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. for 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 and to ISO 29681. The difference can be significant especially when measuring pulps
having a low ionic strength.
ISO 6588-2 differs from this part of ISO 6588 only as regards the extraction conditions. No general guidance
can be
...
INTERNATIONAL ISO
STANDARD 6588-1
Second edition
2012-11-01
Paper, board and pulps —
Determination of pH of aqueous
extracts —
Part 1:
Cold extraction
Papier, carton et pâtes — Détermination du pH des extraits aqueux —
Partie 1: Extraction à froid
Reference number
ISO 6588-1:2012(E)
©
ISO 2012
---------------------- Page: 1 ----------------------
ISO 6588-1:2012(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2012
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any
means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the
address below or ISO’s member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2012 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 6588-1:2012(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Principle . 1
4 Reagents . 2
5 Apparatus and equipment . 2
6 Sampling and preparation of sample . 2
6.1 Sampling . 2
6.2 Preparation of sample. 2
7 Procedure. 2
7.1 Weighing . 3
7.2 Extraction . 3
7.3 Determination of pH . 3
8 Calculation . 3
9 Test report . 3
Annex A (informative) Preparation of some standard buffer solutions . 5
Annex B (informative) Precision . 6
Bibliography . 8
© ISO 2012 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 6588-1:2012(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International
Standards adopted by the technical committees are circulated to the member bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the member bodies
casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 6588-1 was prepared by Technical Committee ISO/TC 6, Paper, board and pulps.
This second edition cancels and replaces the first edition (ISO 6588-1:2005), which has been technically
revised. The major difference compared with the previous edition is the addition of a paragraph in the
[5]
scope to differentiate the results obtained with this standard from those obtained using ISO 29681 .
ISO 6588 consists of the following parts, under the general title Paper, board and pulps — Determination
of pH of aqueous extracts:
— Part 1: Cold extraction
— Part 2: Hot extraction
iv © ISO 2012 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 6588-1:2012(E)
Introduction
Kraft fibre is well known to contain ionisable groups that are fixed to or in the fibre wall. In order to fulfil
the electro-neutrality, these groups are balanced by an equivalent number of positive charges, which
can be either protons or various metal ions. Especially in pulp suspensions at low ionic strengths, this
can give rise to a marked uneven distribution of mobile ions between the volume held by the fibre wall
and the bulk suspension liquor. This means that the fibre acts as an ion exchanger. These ion-exchange
[2, 3]
phenomena can be modelled very well with the Donnan theory .
If a relatively clean pulp fibre sample, for example bleached dried pulp, is diluted in deionised water,
the result will be a pulp suspension with a very low ionic strength. In such a system, most of the cations
present, including protons, will be concentrated in the water volume held by the fibre wall. If the pH
is measured, it will be measured in the bulk suspension liquor. By adding salt to this kind of system,
the ion exchange phenomena will be decreased, and the concentration of different cations will be the
same in the water held by the fibre wall and in the bulk suspension liquor. Since the process waters
always contain a certain amount of ions, such a salt addition will give a more realistic environment when
measuring the pH of relatively clean pulp samples.
It is necessary to be aware of these effects when interpreting the measured pH-values of highly
purified pulps.
© ISO 2012 – All rights reserved v
---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 6588-1:2012(E)
Paper, board and pulps — Determination of pH of
aqueous extracts —
Part 1:
Cold extraction
1 Scope
This part of ISO 6588 specifies a method for the determination of the pH-value defined by the electrolytes
extractable by cold water from a sample of paper, board or pulp.
This part of ISO 6588 is applicable to all types 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. for 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 and to ISO 29681. The difference can be significant especially when measuring pulps
having a low ionic strength.
ISO 6588-2 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
(see [4] in the Bibliography).
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments)
...
NORME ISO
INTERNATIONALE 6588-1
Deuxième édition
2012-11-01
Papier, carton et pâtes — Détermination
du pH des extraits aqueux —
Partie 1:
Extraction à froid
Paper, board and pulps — Determination of pH of aqueous extracts —
Part 1: Cold extraction
Numéro de référence
ISO 6588-1:2012(F)
©
ISO 2012
---------------------- Page: 1 ----------------------
ISO 6588-1:2012(F)
DOCUMENT PROTÉGÉ PAR COPYRIGHT
© ISO 2012
Droits de reproduction réservés. Sauf prescription différente, aucune partie de cette publication ne peut être reproduite ni utilisée
sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie et les microfilms, sans
l’accord écrit de l’ISO à l’adresse ci-après ou du comité membre de l’ISO dans le pays du demandeur.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Publié en Suisse
ii © ISO 2012 – Tous droits réservés
---------------------- Page: 2 ----------------------
ISO 6588-1:2012(F)
Avant-propos
L’ISO (Organisation internationale de normalisation) est une fédération mondiale d’organismes
nationaux de normalisation (comités membres de l’ISO). L’élaboration des Normes internationales est
en général confiée aux comités techniques de l’ISO. Chaque comité membre intéressé par une étude
a le droit de faire partie du comité technique créé à cet effet. Les organisations internationales,
gouvernementales et non gouvernementales, en liaison avec l’ISO participent également aux travaux.
L’ISO collabore étroitement avec la Commission électrotechnique internationale (CEI) en ce qui concerne
la normalisation électrotechnique.
Les Normes internationales sont rédigées conformément aux règles données dans les Directives
ISO/CEI, Partie 2.
La tâche principale des comités techniques est d’élaborer les Normes internationales. Les projets de
Normes internationales adoptés par les comités techniques sont soumis aux comités membres pour vote.
Leur publication comme Normes internationales requiert l’approbation de 75 % au moins des comités
membres votants.
L’attention est appelée sur le fait que certains des éléments du présent document peuvent faire l’objet de
droits de propriété intellectuelle ou de droits analogues. L’ISO ne saurait être tenue pour responsable de
ne pas avoir identifié de tels droits de propriété et averti de leur existence.
L’ISO 6588-1 a été élaborée par le comité technique ISO/TC 6, Papiers, cartons et pâtes.
Cette deuxième édition annule et remplace la première édition (ISO 6588-1:2005) qui a fait l’objet d’une
révision technique. La principale différence en comparaison avec l’édition précédente est l’ajout d’un
alinéa dans le domaine d’application pour marquer la différence entre les résultats obtenus à l’aide de la
[5]
présente norme et ceux obtenus à l’aide de l’ISO 29681 .
L’ISO 6588 comprend les parties suivantes, présentées sous le titre général Papier, carton et pâtes —
Détermination du pH des extraits aqueux:
— Partie 1: Extraction à froid
— Partie 2: Extraction à chaud
© ISO 2012 – Tous droits réservés iii
---------------------- Page: 3 ----------------------
ISO 6588-1:2012(F)
Introduction
Il est bien connu que la fibre kraft contient des groupes ionisables qui sont fixés sur ou dans la paroi
de la fibre. Afin de satisfaire l’électroneutralité, ces groupes sont équilibrés par un nombre égal de
charges positives, qui peuvent être des protons ou des ions métalliques divers. En particulier dans les
suspensions de pâtes de faible concentration ionique, cela peut mener à une distribution inégale des ions
mobiles entre le volume emprisonné dans la paroi de la fibre et le reste de la suspension. Cela signifie
que les fibres agissent comme un échangeur d’ions. Ces phénomènes d’échange d’ions peuvent être très
[2] [3]
bien modélisés à l’aide de la théorie de Donnan .
Si un échantillon de fibres d’une pâte relativement propre, par exemple une pâte blanchie et séchée, est
dilué dans de l’eau déionisée, le résultat sera une suspension de pâte de très faible concentration ionique.
Dans un tel système, la plupart des cations présents, y compris les protons, sont concentrés dans un
volume d’eau retenu par la paroi de la fibre. Si le pH est mesuré, il s’agit du pH de la pâte environnante.
En ajoutant un sel à ce type de système, le phénomène d’échange d’ions est diminué et la concentration
des différents cations sera identique dans l’eau emprisonnée par la paroi de la fibre et le reste de la pâte
en suspension. Puisque les eaux de procédés contiennent toujours une certaine quantité d’ions, un tel
ajout d’un sel résultera en un environnement plus réaliste lors de la mesure du pH d’échantillons de
pâtes relativement propres.
Il est nécessaire d’être conscient de ces effets lors de l’interprétation des valeurs de pH telles que
mesurées pour des pâtes hautement purifiées.
iv © ISO 2012 – Tous droits réservés
---------------------- Page: 4 ----------------------
NORME INTERNATIONALE ISO 6588-1:2012(F)
Papier, carton et pâtes — Détermination du pH des
extraits aqueux —
Partie 1:
Extraction à froid
1 Domaine d’application
La présente partie de l’ISO 6588 spécifie une méthode pour la détermination du pH défini par les
électrolytes extractibles d’un échantillon de papier, de carton ou de pâte, par de l’eau froide.
La présente partie de l’ISO 6588 est applicable à tous les types de papiers, de cartons et de pâtes.
Lorsque la quantité de substance ionique extractible est presque nulle, comme dans le cas des pâtes
hautement purifiées, la fidélité de la méthode devient mauvaise en raison des difficultés rencontrées
lors de la réalisation des mesurages de pH d’une eau contenant peu de substances électrolytiques.
Puisque, dans la présente partie de l’ISO 6588, l’extraction est effectuée avec de l’eau distillée ou
déionisée, le pH mesuré est parfois différent (par exemple pour une pâte hautement blanchie) de celui
mesuré dans les conditions mises en œuvre pendant le procédé industriel lors duquel différents types
d’eaux de procédé sont utilisés, par exemple de l’eau de rivière traitée chimiquement contenant des
électrolytes.
Il est nécessaire d’avoir conscience du fait que les résultats obtenus en mesurant le pH conformément à
la présente partie de l’ISO 6588 seront différents de ceux obtenus à l’aide de l’ISO 29681. Ces différences
peuvent être significatives, notamment lors d’un mesurage sur des pâtes de faible concentration ionique.
L’ISO 6588-2 ne diffère de la présente partie de l’ISO 6588 qu’au sujet des conditions d’extraction. Aucune
ligne directrice générale ne peut être donnée concernant le mode opératoire le plus adapté (extraction
à chaud ou à froid) en fonction d’une situation donnée.
Pour les papiers cellulosiques à usages électriques, il est recommandé d’utiliser la méthode indiquée
[4]
dans la CEI 60554-2 .
2 Références normatives
Les documents de référence suivants sont indispensables pour l’application du présent document. Pour
les références datées, seule l’édition citée s’applique. Pour les références non datées, la dernière édition
du document de référence s’applique (y compris les éventuels amendements).
ISO 186, Papier et carton — Échantillonnage pour déterminer la qualité moyenne
ISO 3696, Eau pour laboratoire à usage analytique — Spécification et méthodes d’essai
ISO 7213, Pâtes — Échantillonnage pour essais
3 Principe
Extraction d’un échantillon de 2 g pendant 1 h avec 100 ml d’eau froide de haute pureté. Filtration de
l’extrait et ajout d’une solution saline. Mesurage du pH de l’extrait à une température comprise entre
20 °C et 25 °C.
© ISO 2012 – Tous droits réservés 1
---------------------- Page: 5 ----------------------
ISO 6588-1:2012(F)
4 Réactifs
4.1 Eau, distillée ou déionisée, à utiliser durant toute la durée de l’essai. La conductivité de l’eau ne doit
pas être supérieure à 0,1 mS/m après 1 h d’ébullition, puis refroidissement dans une atmosphère sans
acide (par exemple exempte de CO , SO , H S) jusqu’à une température comprise entre 20 °C et 25 °C. Il
2 2 2
convient que le pH de l’eau soit compris entre 6,8 et 7,3. Des instructions relatives à la détermination de
la conductivité sont spécifiées dans l’ISO 3696.
4.2 Solutions tampons étalons, ayant un pH connu d’environ 4, 7 et 9. De telles solutions tampons
sont disponibles dans le commerce. Quelques exemples de solutions tampons appropriées sont donnés
dans l’Annexe A et leur préparation y est décrite.
4.3 Solution de chlorure de potassium, 1 M. Dissoudre 7,4 g de KCl, de qualité analytique, dans 100 ml
d’eau distillée fraîchement bouillie. Préparer une solution fraîche chaque semaine.
5 Appareillage et équipement
En plus de l’appareillage et de l’équipement de laboratoire courant, utiliser ce qui suit.
5.1 Verrerie, constituée de verre résistant aux produits chimiques, fioles à joints en verre dépoli,
bouchons, béchers et filtre en verre fritté. Toute la verrerie doit être nettoyée avec une solution de
nettoyage acide, sans utiliser de savon ou de détergent et doit être soigneusement rincée à l’eau (4.1) et
séchée avant usage.
5.2 pH-mètre, équipé d’électrodes en verre et au calomel ou d’une électrode combinée, permettant de
lire une valeur de pH à au moins 0,05 unité de pH près.
6 Échantillonnage et préparation de l’échantillon
6.1 Échantillonnage
Le mode opératoire d’échantillonnage à suivre dépend des c
...
SLOVENSKI STANDARD
oSIST ISO 6588-1:2013
01-februar-2013
3DSLUNDUWRQOHSHQNDLQYODNQLQH'RORþDQMHS+YUHGQRVWLYRGQLKHNVWUDNWRY
GHO (NVWUDNFLMDYKODGQHP
Paper, board and pulps -- Determination of pH of aqueous extracts -- Part 1: Cold
extraction
Papier, carton et pâtes -- Détermination du pH des extraits aqueux -- Partie 1: Extraction
à froid
Ta slovenski standard je istoveten z: ISO 6588-1:2012
ICS:
85.040 Vlaknine Pulps
85.060 Papir, karton in lepenka Paper and board
oSIST ISO 6588-1:2013 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST ISO 6588-1:2013
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oSIST ISO 6588-1:2013
INTERNATIONAL ISO
STANDARD 6588-1
Second edition
2012-11-01
Paper, board and pulps —
Determination of pH of aqueous
extracts —
Part 1:
Cold extraction
Papier, carton et pâtes — Détermination du pH des extraits aqueux —
Partie 1: Extraction à froid
Reference number
ISO 6588-1:2012(E)
©
ISO 2012
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oSIST ISO 6588-1:2013
ISO 6588-1:2012(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2012
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any
means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the
address below or ISO’s member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2012 – All rights reserved
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oSIST ISO 6588-1:2013
ISO 6588-1:2012(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Principle . 1
4 Reagents . 2
5 Apparatus and equipment . 2
6 Sampling and preparation of sample . 2
6.1 Sampling . 2
6.2 Preparation of sample. 2
7 Procedure. 2
7.1 Weighing . 3
7.2 Extraction . 3
7.3 Determination of pH . 3
8 Calculation . 3
9 Test report . 3
Annex A (informative) Preparation of some standard buffer solutions . 5
Annex B (informative) Precision . 6
Bibliography . 8
© ISO 2012 – All rights reserved iii
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oSIST ISO 6588-1:2013
ISO 6588-1:2012(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International
Standards adopted by the technical committees are circulated to the member bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the member bodies
casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 6588-1 was prepared by Technical Committee ISO/TC 6, Paper, board and pulps.
This second edition cancels and replaces the first edition (ISO 6588-1:2005), which has been technically
revised. The major difference compared with the previous edition is the addition of a paragraph in the
[5]
scope to differentiate the results obtained with this standard from those obtained using ISO 29681 .
ISO 6588 consists of the following parts, under the general title Paper, board and pulps — Determination
of pH of aqueous extracts:
— Part 1: Cold extraction
— Part 2: Hot extraction
iv © ISO 2012 – All rights reserved
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oSIST ISO 6588-1:2013
ISO 6588-1:2012(E)
Introduction
Kraft fibre is well known to contain ionisable groups that are fixed to or in the fibre wall. In order to fulfil
the electro-neutrality, these groups are balanced by an equivalent number of positive charges, which
can be either protons or various metal ions. Especially in pulp suspensions at low ionic strengths, this
can give rise to a marked uneven distribution of mobile ions between the volume held by the fibre wall
and the bulk suspension liquor. This means that the fibre acts as an ion exchanger. These ion-exchange
[2, 3]
phenomena can be modelled very well with the Donnan theory .
If a relatively clean pulp fibre sample, for example bleached dried pulp, is diluted in deionised water,
the result will be a pulp suspension with a very low ionic strength. In such a system, most of the cations
present, including protons, will be concentrated in the water volume held by the fibre wall. If the pH
is measured, it will be measured in the bulk suspension liquor. By adding salt to this kind of system,
the ion exchange phenomena will be decreased, and the concentration of different cations will be the
same in the water held by the fibre wall and in the bulk suspension liquor. Since the process waters
always contain a certain amount of ions, such a salt addition will give a more realistic environment when
measuring the pH of relatively clean pulp samples.
It is necessary to be aware of these effects when interpreting the measured pH-values of highly
purified pulps.
© ISO 2012 – All rights reserved v
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oSIST ISO 6588-1:2013
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oSIST ISO 6588-1:2013
INTERNATIONAL STANDARD ISO 6588-1:2012(E)
Paper, board and pulps — Determination of pH of
aqueous extracts —
Part 1:
Cold extraction
1 Scope
This part of ISO 6588 specifies a method for the determination of the pH-value defined by the electrolytes
extractable by cold water from a sample of paper, board or pulp.
This part of ISO 6588 is applicable to all types 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. for 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 and to ISO 29681. The difference can be significant especially when measuring pulps
having a low ionic strength.
ISO 6588-2 differs from this part of ISO 6588 only as regards the extraction conditions. No general guidance
can be given as to
...
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