Surface active agents - Determination of inorganic sulphate content in anionic surface active agents - Potentiometric lead selective electrode titration method

This European Standard specifies a method for the determination of the content of inorganic sulphate in anionic surface active agents. It can be applied to a-olefin sulphonates and n-olefin sulphonates, alcohol sulphates, alcohol ether sulphates, alkyl benzene sulphonates and other alkyl sulphonates. This method is used also for the determination of inorganic sulphate in alkyl benzene sulphonates or other alkyl sulphonates in their acid form. This method also applies to deep-coloured samples.
NOTE   Sulphate can be present as sulphuric acid, ionic salts of this acid or mixture of these.

Grenzflächenaktive Stoffe - Bestimmung des Gehaltes an anorganischen Sulfaten in anionischen grenzflächenaktiven Stoffen - Potentiometrische Titration mit einer bleiselektiven Elektrode

Diese Europäische Norm legt ein Verfahren zur Bestimmung des Gehaltes an anorganischen Sulfaten in anionischen grenzflächenaktiven Stoffen fest. Sie gilt für a-Olefin- (Alkenyl-) und n-Olefinsulfonate, Alkohol-sulfate, Alkoholethersulfate, Alkylbenzol- und andere Alkylsulfonate. Das Verfahren ist auch anwendbar auf die Gehaltsbestimmung von anorganischen Sulfaten in den jeweiligen Alkylbenzolsulfon- oder anderen Alkylsulfonsäuren.
ANMERKUNG   Sulfat kann als Schwefelsäure, ionische Salze dieser Säure oder in beiden Formen vorliegen.

Agents de surface - Détermination de la teneur en sulfate inorganique dans les agents de surface anioniques - Méthode potentiométrique de titrage avec électrode a membrane sélective au plomb

La présente Norme européenne spécifie une méthode permettant de déterminer la teneur en sulfate inorganique dans les agents de surface anioniques. Elle peut s'appliquer aux sulfonates a-oléfine et n-oléfine, aux sulfates d'alcool, aux sulfates d'éther d'alcool, aux sulfonates d'alkylbenzene et a d'autres sulfonates d'alkyle. Cette méthode est également utilisée pour déterminer la teneur en sulfate inorganique dans les sulfonates d'alkylbenzene ou dans d'autres sulfonates d'alkyle qui se trouvent sous forme acide. Cette méthode s'applique également aux échantillons de couleur foncée.
NOTE   Le sulfate peut etre présent sous la forme d'acide sulfurique, de sels ioniques de cet acide ou d'un mélange de ces deux formes.

Površinsko aktivne snovi - Določevanje vsebnosti anorganskega sulfata v anionskih površinsko aktivnih snoveh - Metoda potenciometrične titracije z uporabo svinčeve (Pb) ionoselektivne elektrode

General Information

Status
Published
Publication Date
31-Dec-2005
Withdrawal Date
31-Dec-2005
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
01-Jan-2006
Due Date
01-Jan-2006
Completion Date
01-Jan-2006

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SLOVENSKI STANDARD
SIST EN 14880:2006
01-januar-2006
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DQLRQVNLKSRYUãLQVNRDNWLYQLKVQRYHK0HWRGDSRWHQFLRPHWULþQHWLWUDFLMH]
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Surface active agents - Determination of inorganic sulphate content in anionic surface

active agents - Potentiometric lead selective electrode titration method
Grenzflächenaktive Stoffe - Bestimmung des Gehaltes an anorganischen Sulfaten in
anionischen grenzflächenaktiven Stoffen - Potentiometrische Titration mit einer
bleiselektiven Elektrode

Agents de surface - Détermination de la teneur en sulfate inorganique dans les agents

de surface anioniques - Méthode potentiométrique de titrage avec électrode a membrane

sélective au plomb
Ta slovenski standard je istoveten z: EN 14880:2005
ICS:
71.100.40 Površinsko aktivna sredstva Surface active agents
SIST EN 14880:2006 en

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

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SIST EN 14880:2006
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SIST EN 14880:2006
EUROPEAN STANDARD
EN 14880
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2005
ICS 71.100.40
English Version
Surface active agents - Determination of inorganic sulphate
content in anionic surface active agents - Potentiometric lead
selective electrode titration method

Agents de surface - Détermination de la teneur en sulfate Grenzflächenaktive Stoffe - Bestimmung des Gehaltes an

inorganique dans les agents de surface anioniques - anorganischen Sulfaten in anionischen grenzflächenaktiven

Méthode potentiométrique de titrage avec électrode à Stoffen - Potentiometrische Titration mit einer bleiselektiven

membrane sélective au plomb Elektrode
This European Standard was approved by CEN on 8 July 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 14880:2005: E

worldwide for CEN national Members.
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SIST EN 14880:2006
EN 14880:2005 (E)
Contents
Page

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

1 Scope ...................................................................................................................................................4

2 Normative references .........................................................................................................................4

3 Principle...............................................................................................................................................4

4 Reagents..............................................................................................................................................4

5 Apparatus ............................................................................................................................................5

6 Sampling and preparation of the test solution .................................................................................5

7 Procedure ............................................................................................................................................5

8 Calculation and expression of results...............................................................................................7

9 Precision..............................................................................................................................................7

10 Test report ...........................................................................................................................................7

Annex A (informative) Titration apparatus settings.....................................................................................8

Annex B (informative) Results of inter-laboratory test ..............................................................................10

Bibliography...................................................................................................................................................11

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SIST EN 14880:2006
EN 14880:2005 (E)
Foreword

This European Standard (EN 14880:2005) 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 February 2006, and conflicting national standards shall be withdrawn at the latest

by February 2006.

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.

---------------------- Page: 5 ----------------------
SIST EN 14880:2006
EN 14880:2005 (E)
1 Scope

This European Standard specifies a method for the determination of the content of inorganic sulphate in anionic

surface active agents. It can be applied to α-olefin sulphonates and n-olefin sulphonates, alcohol sulphates, alcohol

ether sulphates, alkyl benzene sulphonates and other alkyl sulphonates. This method is used also for the

determination of inorganic sulphate in alkyl benzene sulphonates or other alkyl sulphonates in their acid form. This

method also applies to deep-coloured samples.

NOTE Sulphate can be present as sulphuric acid, ionic salts of this acid or mixture of these.

2 Normative references

The following referenced documents are indispensable for the application of this European Standard. 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)

ISO 607, Surface active agents and detergents – Methods of sample division
3 Principle

Potentiometric titration of the test sample containing inorganic sulphate is performed in non-aqueous medium with

a lead nitrate standard volumetric solution. The reaction is the following:
2− −
Pb(NO ) + SO → PbSO ↓+2NO
3 2 4 4 3

Lead sulphate precipitate is formed during the titration and the non-aqueous medium decreases its solubility. Nitric

acid is added to remove possible interference from carbonates. The endpoint is related to an increase in lead ion

activity, as measured by a lead-selective electrode.
4 Reagents

During the analysis, unless otherwise specified, use only reagents of recognised analytical grade that have been

checked in advance as to not interfere with the analytical results.
4.1 Water, complying with grade 3 as defined in EN ISO 3696.

NOTE If the water is purified via ion-exchange resins, ensure that no cationic or anionic species from the resins cause

interference.
4.2 Nitric acid, solution c(HNO ) = 1 mol/l.
4.3 Lead nitrate standard volumetric solution, c(Pb(NO ) ) = 0,01 mol/l.
3 2

Weigh 3,312 g of lead nitrate, previously dried at 150 °C in a vacuum oven, dissolve in water, by using a small

beaker. Quantitatively transfer the solution into a 1 000 ml volumetric flask and add water up to the mark.

4.4 Lead nitrate standard volumetric solution, c(Pb(NO ) ) = 0,005 mol/l.
3 2

Weigh 1,656 g of lead nitrate, previously dried at 150 °C in a vacuum oven, dissolve in water, by using a small

beaker. Quantitatively transfer the solution into a 1 000 ml volumetric flask and add water up to the mark.

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SIST EN 14880:2006
EN 14880:2005 (E)
4.5 Potassium sulphate solution, c(K SO ) = 0,01 mol/l.
2 4

Weigh approximately 1,74 g (m) of K SO , previously dried in an oven at 180 °C, dissolve with water in a 1 000 ml

2 4
volumetric flask, make up to the mark and homogenize.
Calculate the factor, f, of the solution, according to the Equation (1):
f= (1)
1,7425
where
m is the mass of potassium sulphate weighted, in grams;
1,742 5 is the mass, in grams, of 0,01 mole of potassium sulphate K SO .
2 4
4.6 Pro
...

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