Surface active agents - Determination of physical stability in alkaline and acid solutions

This European Standard specifies a method for the determination of physical stability of surface active agents in alkaline and acid solutions. It is applicable to all classes of surface active agents and also to other substances or mixtures such as polymers, complexing agents and formulations of surface active agents.

Grenzflächenaktive Stoffe - Bestimmung der physikalischen Stabilität in alkalischer und saurer Lösung

Diese Europäische Norm legt ein Verfahren zur Bestimmung der physikalischen Stabilität von grenzflächen-
aktiven Stoffen in alkalischer und saurer Lösung fest. Das Verfahren gilt für alle Klassen von grenzflächenak-
tiven Stoffen, aber auch für andere Stoffe oder Mischungen wie Polymere, Komplexiermittel und Formulierun-
gen von grenzflächenaktiven Stoffen.

Agents de surface - Détermination de la stabilité physique dans les solutions alcalines et acides

La présente Norme européenne spécifie une méthode de détermination de la stabilité physique des agents de surface dans les solutions alcalines et acides. Elle est applicable à toutes les classes d'agents de surface ainsi qu'à d'autres substances ou mélanges tels que les polymères, les agents complexants et les formulations d'agents de surface.

Površinsko aktivne snovi – Določanje fizikalne stabilnosti alkalnih in kislih raztopin

General Information

Status
Published
Publication Date
17-May-2005
Current Stage
9060 - Closure of 2 Year Review Enquiry - Review Enquiry
Due Date
04-Mar-2021
Completion Date
04-Mar-2021

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SLOVENSKI STANDARD
SIST EN 14712:2005
01-november-2005
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Surface active agents - Determination of physical stability in alkaline and acid solutions

Grenzflächenaktive Stoffe - Bestimmung der physikalischen Stabilität in alkalischer und

saurer Lösung

Agents de surface - Détermination de la stabilité physique dans les solutions alcalines et

acides
Ta slovenski standard je istoveten z: EN 14712:2005
ICS:
71.100.40 Površinsko aktivna sredstva Surface active agents
SIST EN 14712:2005 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 14712:2005
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SIST EN 14712:2005
EUROPEAN STANDARD
EN 14712
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2005
ICS 71.100.40
English version
Surface active agents - Determination of physical stability in
alkaline and acid solutions

Agents de surface - Détermination de la stabilité physique Grenzflächenaktive Stoffe - Bestimmung der physikalischen

dans les solutions alcalines et acides Stabilität in alkalischer und saurer Lösung

This European Standard was approved by CEN on 25 March 2005.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European

Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national

standards may be obtained on application to the Central Secretariat or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation

under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official

versions.

CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,

Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,

Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels

© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 14712:2005: E

worldwide for CEN national Members.
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SIST EN 14712:2005
EN 14712:2005 (E)
Contents
Page

Foreword......................................................................................................................................................................3

Introduction .................................................................................................................................................................4

1 Scope ..............................................................................................................................................................5

2 Normative references ....................................................................................................................................5

3 Terms and definitions ...................................................................................................................................5

4 Principle..........................................................................................................................................................5

5 Reagents.........................................................................................................................................................5

6 Apparatus .......................................................................................................................................................6

7 Procedure .......................................................................................................................................................6

8 Expression of results ....................................................................................................................................8

9 Test report ......................................................................................................................................................8

Annex A (normative) Forms for the test report ......................................................................................................9

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SIST EN 14712:2005
EN 14712:2005 (E)
Foreword

This European Standard (EN 14712:2005) has been prepared by Technical Committee CEN/TC 276 “Surface

active agents”, the secretariat of which is held by AFNOR.

This European Standard shall be given the status of a national standard, either by publication of an identical text or

by endorsement, at the latest by November 2005, and conflicting national standards shall be withdrawn at the latest

by November 2005.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following

countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark,

Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,

Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

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SIST EN 14712:2005
EN 14712:2005 (E)
Introduction

The stability of a surface active agent in alkaline and acid solutions is its physical stability during the defined time

period, as judged by its appearance. The statement "the surface active agent A has an alkaline stability of x g

NaOH per litre" means that the surface active agent A can be dissolved in a concentration of 10 g/l in an aqueous

solution containing up to x g NaOH per litre to give a stable solution. Analogously the statement "the surface active

agent A has an acid stability of y ml sulfuric acid per litre" means that the surface active agent A can be dissolved

with a concentration of 10 g/l in an aqueous solution containing up to y ml sulfuric acid per litre (with a purity of

95 % to 97 %) to give a stable solution.

It should be noted that miscibility gaps can occur, i.e. the solution can be unstable at intermediate alkali or acid

concentrations.

The definition of a stable solution depends on the application of the surface active agent or surface active agent

formulation. Thus homogeneous opalescent or turbid solutions may be considered either stable or unstable.

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SIST EN 14712:2005
EN 14712:2005 (E)
1 Scope

This European Standard specifies a method for the determination of physical stability of surface active agents in

alkaline and acid solutions. It is applicable to all classes of surface active agents and also to other substances or

mixtures such as polymers, complexing agents and formulations of surface active agents.

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) applies.

EN ISO 3696, Water for analytical laboratory use — Specification and test methods (ISO 3696:1987).

3 Terms and definitions

For the purposes of this European Standard, the following terms and definitions apply.

3.1
alkaline stability

maximum mass concentration of sodium hydroxide (purity at least of 98 %) in grams per litre at which the surface

active agent can be dissolved in the alkaline solution with a mass concentration of 1 % to yield a stable solution

3.2
acid stability

maximum volume concentration of sulfuric acid (purity 95 % to 98 %), in millilitres per litre, at which the surface

active agent can be dissolved in the acid solution with a mass concentration of 1 % to yield a stable solution

3.3
other bases and acids

other bases and acids may be used. This should be described together with the purity in the test report

4 Principle

Aqueous solutions are prepared with increasing concentrations of sodium hydroxide or sulfuric acid respectively.

Then the surface active agent to be tested is mixed in these aqueous solutions. The formulations are examined

visually after 24 h of storage at ambient temperature (22 ± 3) °C to see whether a stable solution resulted or not.

Clear homogeneous solutions are always considered stable, whereas phase separation indicates instability.

Homogeneous opalescent or homogeneous turbid samples can be considered either stable or unstable depending

on the surface active agent application.
5 Reagents
5.1 Water, grade 3, in accordance with EN ISO 3696.

5.2 Sodium hydroxide, NaOH, analytical grade, preferably as an aqueous solution with a mass concentration

of 30 % NaOH (this corresponds to 398 g NaOH (100 % active substance) in 1 l ; density ρ= 1,328 g/ml at 20 °C).

5.3 Sulfuric acid, H SO , analytical grade, preferably as an aqueous solution with a mass concentration of

2 4
25 % H SO (density ρ = 1,18 g/ml at 20 °C).
2 4
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SIST EN 14712:2005
EN 14712:2005 (E)
6 Apparatus
6.1 General
Ordinary laboratory apparatus and the following:

6.2 Glass beakers or bottles with magnetic stirrer sticks, for storing and assessing the sample

solutions. 125 ml screw-top jars are recommended.
NOTE Within the series the same type o
...

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