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

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ISO 4323:2018 - Soaps -- Determination of chloride content -- Potentiometric method
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Second edition
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)

© ISO 2018
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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)

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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
The main changes compared to the previous edition are as follows:
— Replaced water with water + isopropanol (1 + 1) as solvent in determination.
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iv © ISO 2018 – All rights reserved

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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/
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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