SIST ISO 685:2020
Analysis of soaps - Determination of total alkali content and total fatty matter content
Analysis of soaps - Determination of total alkali content and total fatty matter content
This document specifies a method for the simultaneous determination of the total alkali content and the total fatty matter content of soaps (including liquid soaps), excluding compounded products.
Analyse des savons - Détermination des teneurs en alcali total et en matière grasse totale
Le pr�sent document sp�cifie une m�thode de d�termination simultan�e des teneurs en alcali total et en mati�re grasse totale des savons (y compris des savons liquides), � l'exclusion des compositions.
Analiza mila - Določevanje celotnih alkalij in celotnih maščobnih snovi
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INTERNATIONAL ISO
STANDARD 685
Second edition
2020-02
Analysis of soaps — Determination
of total alkali content and total fatty
matter content
Analyse des savons — Détermination des teneurs en alcali total et en
matière grasse totale
Reference number
ISO 685:2020(E)
©
ISO 2020
---------------------- Page: 1 ----------------------
ISO 685:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 685:2020(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Reagents . 2
6 Apparatus . 2
7 Sampling . 2
8 Procedure. 2
8.1 General . 2
8.2 Test portion . 3
8.3 Determination . 3
8.3.1 General. 3
8.3.2 Determination of total alkali content . 3
8.3.3 Determination of total fatty matter content . . 4
9 Expression of results . 4
9.1 Total alkali content . 4
9.1.1 Method of calculation and formulae . 4
9.1.2 Reproducibility . 5
9.2 Total fatty matter content . 5
9.2.1 Method of calculation and formula . 5
9.2.2 Reproducibility . 5
10 Test report . 5
© ISO 2020 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 685:2020(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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
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. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 91, Surface active agents.
This second edition cancels and replaces the first edition (ISO 685:1975), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— “liquid soaps” has been added in the Scope;
— the sentence “This method for the determination of total alkali is not applicable to coloured soaps if
the colour interferes with the methyl orange end-point.” has been deleted from the Scope;
— in 8.3.1, “until there is an excess of about 5 ml” has been changed to “until there is an excess of
about 10 ml”;
— in 8.3.1, “Repeat the shaking until the aqueous layer has become clear” has been changed to “Repeat
the shaking until the water phase is clearly separated from the organic phase (if the two-phase layer
is not obvious, the emulsification can be broken by adding ethanol that does not exceed the volume
of the water phase)”;
— in 8.3.2, the sentence “If the soap colour interferes with the methyl orange end-point, a pH meter can
be used to indicate the end point (pH value 3,1 to 4.4, maintain 10 s) during titration.” has been added.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2020 – All rights reserved
---------------------- Page: 4 ----------------------
INTERNATIONAL STANDARD ISO 685:2020(E)
Analysis of soaps — Determination of total alkali content
and total fatty matter content
1 Scope
This document specifies a method for the simultaneous determination of the total alkali content and
the total fatty matter content of soaps (including liquid soaps), excluding compounded products.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 3819, Laboratory glassware — Beakers
ISO 8212, Soaps and detergents — Techniques of sampling during manufacture
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
total alkali
sum of the alkali bases combined as soap with fatty and rosin acids, as well as those corresponding to
free alkali metal hydroxides or carbonates and to any silicates present which will be titrated under the
test conditions
Note 1 to entry: The results are expressed as a percentage mass fraction of either sodium hydroxide
...
SLOVENSKI STANDARD
SIST ISO 685:2020
01-junij-2020
Analiza mila - Določevanje celotnih alkalij in celotnih maščobnih snovi
Analysis of soaps - Determination of total alkali content and total fatty matter content
Analyse des savons - Détermination des teneurs en alcali total et en matière grasse
totale
Ta slovenski standard je istoveten z: ISO 685:2020
ICS:
71.100.70 Kozmetika. Toaletni Cosmetics. Toiletries
pripomočki
SIST ISO 685:2020 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
SIST ISO 685:2020
---------------------- Page: 2 ----------------------
SIST ISO 685:2020
INTERNATIONAL ISO
STANDARD 685
Second edition
2020-02
Analysis of soaps — Determination
of total alkali content and total fatty
matter content
Analyse des savons — Détermination des teneurs en alcali total et en
matière grasse totale
Reference number
ISO 685:2020(E)
©
ISO 2020
---------------------- Page: 3 ----------------------
SIST ISO 685:2020
ISO 685:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
---------------------- Page: 4 ----------------------
SIST ISO 685:2020
ISO 685:2020(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Reagents . 2
6 Apparatus . 2
7 Sampling . 2
8 Procedure. 2
8.1 General . 2
8.2 Test portion . 3
8.3 Determination . 3
8.3.1 General. 3
8.3.2 Determination of total alkali content . 3
8.3.3 Determination of total fatty matter content . . 4
9 Expression of results . 4
9.1 Total alkali content . 4
9.1.1 Method of calculation and formulae . 4
9.1.2 Reproducibility . 5
9.2 Total fatty matter content . 5
9.2.1 Method of calculation and formula . 5
9.2.2 Reproducibility . 5
10 Test report . 5
© ISO 2020 – All rights reserved iii
---------------------- Page: 5 ----------------------
SIST ISO 685:2020
ISO 685:2020(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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
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. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 91, Surface active agents.
This second edition cancels and replaces the first edition (ISO 685:1975), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— “liquid soaps” has been added in the Scope;
— the sentence “This method for the determination of total alkali is not applicable to coloured soaps if
the colour interferes with the methyl orange end-point.” has been deleted from the Scope;
— in 8.3.1, “until there is an excess of about 5 ml” has been changed to “until there is an excess of
about 10 ml”;
— in 8.3.1, “Repeat the shaking until the aqueous layer has become clear” has been changed to “Repeat
the shaking until the water phase is clearly separated from the organic phase (if the two-phase layer
is not obvious, the emulsification can be broken by adding ethanol that does not exceed the volume
of the water phase)”;
— in 8.3.2, the sentence “If the soap colour interferes with the methyl orange end-point, a pH meter can
be used to indicate the end point (pH value 3,1 to 4.4, maintain 10 s) during titration.” has been added.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2020 – All rights reserved
---------------------- Page: 6 ----------------------
SIST ISO 685:2020
INTERNATIONAL STANDARD ISO 685:2020(E)
Analysis of soaps — Determination of total alkali content
and total fatty matter content
1 Scope
This document specifies a method for the simultaneous determination of the total alkali content and
the total fatty matter content of soaps (including liquid soaps), excluding compounded products.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 3819, Laboratory glassware — Beakers
ISO 8212, Soaps and detergents — Techniques of sampling during manufacture
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// ww
...
NORME ISO
INTERNATIONALE 685
Deuxième édition
2020-02
Analyse des savons — Détermination
des teneurs en alcali total et en
matière grasse totale
Analysis of soaps — Determination of total alkali content and total
fatty matter content
Numéro de référence
ISO 685:2020(F)
©
ISO 2020
---------------------- Page: 1 ----------------------
ISO 685:2020(F)
DOCUMENT PROTÉGÉ PAR COPYRIGHT
© ISO 2020
Tous droits réservés. Sauf prescription différente ou nécessité dans le contexte de sa mise en œuvre, 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, ou la diffusion sur l’internet ou sur un intranet, sans autorisation écrite préalable. Une autorisation peut
être demandée à l’ISO à l’adresse ci-après ou au comité membre de l’ISO dans le pays du demandeur.
ISO copyright office
Case postale 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Genève
Tél.: +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 2020 – Tous droits réservés
---------------------- Page: 2 ----------------------
ISO 685:2020(F)
Sommaire Page
Avant-propos .iv
1 Domaine d’application . 1
2 Références normatives . 1
3 Termes et définitions . 1
4 Principe . 1
5 Réactifs . 2
6 Appareillage . 2
7 Échantillonnage . 2
8 Mode opératoire. 3
8.1 Généralités . 3
8.2 Prise d’essai . 3
8.3 Détermination . 3
8.3.1 Généralités . 3
8.3.2 Détermination de la teneur en alcali total . 4
8.3.3 Détermination de la teneur en matière grasse totale . 4
9 Expression des résultats. 4
9.1 Teneur en alcali total . 4
9.1.1 Méthode de calcul et formules . 4
9.1.2 Reproductibilité . 5
9.2 Teneur en matière grasse totale . 5
9.2.1 Méthode de calcul et formule. 5
9.2.2 Reproductibilité . 5
10 Rapport d’essai . 6
© ISO 2020 – Tous droits réservés iii
---------------------- Page: 3 ----------------------
ISO 685:2020(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 (IEC) en ce qui
concerne la normalisation électrotechnique.
Les procédures utilisées pour élaborer le présent document et celles destinées à sa mise à jour sont
décrites dans les Directives ISO/IEC, Partie 1. Il convient, en particulier, de prendre note des différents
critères d'approbation requis pour les différents types de documents ISO. Le présent document a été
rédigé conformément aux règles de rédaction données dans les Directives ISO/IEC, Partie 2 (voir www
.iso .org/ directives).
L'attention est attirée 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. Les détails concernant
les références aux droits de propriété intellectuelle ou autres droits analogues identifiés lors de
l'élaboration du document sont indiqués dans l'Introduction et/ou dans la liste des déclarations de
brevets reçues par l'ISO (voir www .iso .org/ brevets).
Les appellations commerciales éventuellement mentionnées dans le présent document sont données
pour information, par souci de commodité, à l’intention des utilisateurs et ne sauraient constituer un
engagement.
Pour une explication de la nature volontaire des normes, la signification des termes et expressions
spécifiques de l'ISO liés à l'évaluation de la conformité, ou pour toute information au sujet de l'adhésion
de l'ISO aux principes de l’Organisation mondiale du commerce (OMC) concernant les obstacles
techniques au commerce (OTC), voir www .iso .org/ avant -propos.
Le présent document a été élaboré par le comité technique ISO/TC 91, Agents de surface.
Cette deuxième édition annule et remplace la première édition (ISO 685:1975), qui a fait l’objet d’une
révision technique.
Les principales modifications par rapport à l’édition précédente sont les suivantes:
— les «savons liquides» ont été ajoutés au domaine d’application;
— la phrase «La méthode de détermination de la teneur en alcali total n’est pas applicable aux savons
colorés si la couleur gêne l’appréciation du virage du méthylorange» a été supprimée du domaine
d’application;
— en 8.3.1, «jusqu’à l’obtention d’un excès de 5 ml environ» a été remplacé par «jusqu’à l’obtention d’un
excès de 10 ml environ»;
— en 8.3.1, «Continuer à agiter jusqu’à ce que la couche aqueuse devienne claire» a été remplacé par
«Reprendre l’agitation jusqu’à ce que la phase aqueuse soit nettement séparée de la phase organique
(si la séparation entre les deux phases n’est pas complète (claire limpide), l’émulsion peut être
rompue en ajoutant de l’éthanol dans des proportions qui ne dépassent pas le volume de la phase
aqueuse)»;
— en 8.3.2, la phrase «Si la couleur du savon gêne l’appréciation du virage du méthylorange, un pH-
mètre peut être utilisé pour indiquer le virage (valeur du pH comprise entre 3,1 et 4,4, maintenue
pendant 10 s) pendant le titrage» a été ajoutée.
iv © ISO 2020 – Tous droits réservés
---------------------- Page: 4 ----------------------
ISO 685:2020(F)
Il convient que l’utilisateur adresse tout retour d’information ou toute question concernant le présent
document à l’organisme national de normalisation de son pays. Une liste exhaustive desdits organismes
se trouve à l’adresse www .iso .org/ fr/ members .html.
© ISO 2020 – Tous droits réservés v
---------------------- Page: 5 ----------------------
NORME INTERNATIONALE ISO 685:2020(F)
Analyse des savons — Détermination des teneurs en alcali
total et en matière grasse totale
1 Domaine d’application
Le présent document spécifie une méthode de détermination simultanée des teneurs en alcali total et
en matière grasse totale des savons (y compris des savons liquides), à l’exclusion des compositions.
2 Références normatives
Les documents suivants sont cités dans le texte de sorte qu’ils constituent, pour tout ou partie de leur
contenu, des exigences 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 3819, Verrerie de laboratoire — Béchers
ISO 8212, Savons et détergents — Techniques de l'échantillonnage en cours de fabrication
3 Termes et définitions
Pour les besoins du présent document, les termes et définitions suivants s’appliquent.
L’ISO et l’IEC tiennent à jour des bases de données terminologiques destinées à être utilisées en
normalisation, consultables aux adresses suivantes:
— ISO Online browsing platform: disponible à l’adresse https:// www .iso .org/ obp
— IEC Electropedia: disponible à l’adresse http:// www .electropedia .org/
3.1
alcali total
somme des bases alcalines combinées, sous forme de savon, aux acides gras et résiniques, ainsi que
celles correspondant aux hydroxydes métalliques alcalins ou carbonates métalliques alcalins libres, et,
éventuellement, aux silicates qui seront titrés dans les conditions d’essai
Note 1 à l'article: Les résultats sont exprimés sous forme de fraction massique en pourcentage soit d’hydroxyde
de sodium (NaOH), soit d’hydroxyde de potassium (KOH) selon qu’il s’agit de savons sodiques ou potassiques.
3.2
matière grasse totale
mat
...
SLOVENSKI STANDARD
oSIST ISO/DIS 685:2019
01-november-2019
Analiza mila - Določevanje celotnih alkalij in celotnih maščobnih snovi
Analysis of soaps - Determination of total alkali content and total fatty matter content
Analyse des savons - Détermination des teneurs en alcali total et en matière grasse
totale
Ta slovenski standard je istoveten z: ISO/DIS 685:2019
ICS:
71.100.70 Kozmetika. Toaletni Cosmetics. Toiletries
pripomočki
oSIST ISO/DIS 685:2019 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
oSIST ISO/DIS 685:2019
---------------------- Page: 2 ----------------------
oSIST ISO/DIS 685:2019
DRAFT INTERNATIONAL STANDARD
ISO/DIS 685
ISO/TC 91 Secretariat: ISIRI
Voting begins on: Voting terminates on:
2019-03-11 2019-06-03
Analysis of soaps — Determination of total alkali content
and total fatty matter content
Analyse des savons — Détermination des teneurs en alcali total et en matière grasse totale
ICS: 71.100.40
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
This document is circulated as received from the committee secretariat.
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 685:2019(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
©
PROVIDE SUPPORTING DOCUMENTATION. ISO 2019
---------------------- Page: 3 ----------------------
oSIST ISO/DIS 685:2019
ISO/DIS 685:2019(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
---------------------- Page: 4 ----------------------
oSIST ISO/DIS 685:2019
ISO/DIS 685:2019(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
3.1 total alkali . 1
3.2 total fatty matter . 1
4 Principle . 1
5 Reagents . 2
6 Apparatus . 2
7 Sampling . 2
8 Procedure. 2
8.1 Test portion . 2
8.2 Determination . 3
8.2.1 Determination of total alkali content . 3
8.2.2 Determination of total fatty matter content . . 3
9 Expression of results . 4
9.1 Total alkali content . 4
9.1.1 Method of calculation and formulae . 4
9.1.2 Reproducibility . 4
9.2 Total fatty matter content . 5
9.2.1 Method of calculation and formula . 5
9.2.2 Reproducibility . 5
10 Test report . 5
© ISO 2019 – All rights reserved iii
---------------------- Page: 5 ----------------------
oSIST ISO/DIS 685:2019
ISO/DIS 685:2019(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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).
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. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso
.org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 91, Surface active agents.
This second edition cancels and replaces the first edition (ISO 685:1975), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— Added liquid soaps in scope;
— Deleted “This method for the determination of total alkali is not applicable to coloured soaps if the
colour interferes with the methyl orange end-point.” in scope;
— In 8.2 determination, “until there is an excess of about 5 ml” was changed to “until there is an excess
of about 10 ml” ;
— In 8.2 determination, “Repeat the shaking until the aqueous layer has become clear” was changed
to “Repeated shaking until the water phase is clearly separated from the organic phase (If the two-
phase layer is not obvious, the emulsification can be broken by adding ethanol that does not exceed
the volume of the water phase)” ;
— In 8.2.1 Determination of total alkali content, added the sentence “If the soap colour interferes with
the methyl orange end-point, the pH meter can be used to indicate the end point (pH value 3.1~4.4,
maintain 10s) during titration”.
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oSIST ISO/DIS 685:2019
DRAFT INTERNATIONAL STANDARD ISO/DIS 685:2019(E)
Analysis of soaps — Determination of total alkali content
and total fatty matter content
1 Scope
This document specifies a method for the simultaneous determination of the total alkali content and
the total fatty matter content of soaps (including liquid soaps), excluding compounded products.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
...
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