Soaps -- Determination of chloride content -- Potentiometric method

This document specifies a potentiometric method for the determination of the chloride content of soaps, containing or not containing other surface active agents, and also of compounded products.

Savons -- Dosage des chlorures -- Méthode potentiométrique

General Information

Status
Published
Publication Date
06-Dec-2018
Current Stage
6060 - International Standard published
Start Date
16-Nov-2018
Completion Date
07-Dec-2018
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ISO 4323:2018 - Soaps -- Determination of chloride content -- Potentiometric method
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INTERNATIONAL ISO
STANDARD 4323
Second edition
2018-12
Soaps — Determination of chloride
content — Potentiometric method
Savons — Dosage des chlorures — Méthode potentiométrique
Reference number
ISO 4323:2018(E)
ISO 2018
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ISO 4323:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2018

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.
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Email: copyright@iso.org
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Published in Switzerland
ii © ISO 2018 – All rights reserved
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ISO 4323:2018(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Principle ........................................................................................................................................................................................................................ 1

5 Reagents ........................................................................................................................................................................................................................ 1

6 Apparatus ..................................................................................................................................................................................................................... 2

7 Sampling ........................................................................................................................................................................................................................ 2

8 Procedure..................................................................................................................................................................................................................... 2

8.1 Measurement temperature .......................................................................................................................................................... 2

8.2 Calibration of the silver nitrate solution ........................................................................................................................... 3

8.2.1 Titration................................................................................................................................................................................... 3

8.2.2 Calculation of normality of solution ................................................................................................................ 4

8.3 Determination ......................................................................................................................................................................................... 4

8.3.1 Test portion .......................................................................................................................................................................... 4

8.3.2 Titration................................................................................................................................................................................... 4

8.3.3 Blank test ................................................................................................................................................................................ 4

9 Expression of results ........................................................................................................................................................................................ 5

10 Test report ................................................................................................................................................................................................................... 5

Annex A (informative) Example of how to calculate V .................................................................................................................. 6

© ISO 2018 – All rights reserved iii
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ISO 4323:2018(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 4323:1977), which has been technically

revised.
The main changes compared to the previous edition are as follows:
— Replaced water with water + isopropanol (1 + 1) as solvent in determination.

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 2018 – All rights reserved
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INTERNATIONAL STANDARD ISO 4323:2018(E)
Soaps — Determination of chloride content —
Potentiometric method
1 Scope

This document specifies a potentiometric method for the determination of the chloride content of soaps,

containing or not containing other surface active agents, and also of 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 385, Laboratory glassware — Burettes
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
chloride content of soap products

mass fraction of chloride, expressed as sodium chloride and in percent, determined in accordance with

the procedure described in this document
4 Principle

Potentiometric titration of the chloride (Cl ) ions with standard silver nitrate solution in an acidic

medium, by using either a silver ion selective electrode plus a reference electrode or a combi

...

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