EN ISO 23157:2022
(Main)Determination of the silanol group content on the surface of fumed silica - Reaction gas chromatographic method (ISO 23157:2021)
Determination of the silanol group content on the surface of fumed silica - Reaction gas chromatographic method (ISO 23157:2021)
This document specifies a method for the determination of the silanol group content on the surface of fumed silica by reaction gas chromatographic method.
Bestimmung des Gehaltes an Silanolgruppen auf der Oberfläche von pyrogener Kieselsäure - Gaschromatographisches Verfahren (ISO 23157:2021)
Détermination de la teneur en groupes silanol à la surface de la silice pyrogénée - Méthode par analyse chromatographique en phase gazeuse des gaz de réaction (ISO 23157:2021)
Le présent document spécifie une méthode de détermination de la teneur en groupes silanol à la surface de la silice pyrogénée en recourant à l’analyse chromatographique en phase gazeuse des gaz de réaction.
Določevanje silanolnih skupin na površini pirogenega silicijevega dioksida (kremenčevega dima) - Metoda reakcijske plinske kromatografije (ISO 23157:2021)
Ta dokument določa metodo za določevanje silanolnih skupin na površini pirogenega silicijevega dioksida (kremenčevega dima) z metodo reakcijske plinske kromatografije.
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-januar-2023
Določevanje silanolnih skupin na površini pirogenega silicijevega dioksida
(kremenčevega dima) - Metoda reakcijske plinske kromatografije (ISO 23157:2021)
Determination of the silanol group content on the surface of fumed silica - Reaction gas
chromatographic method (ISO 23157:2021)
Bestimmung des Gehaltes an Silanolgruppen auf der Oberfläche von pyrogener
Kieselsäure - Gaschromatographisches Verfahren (ISO 23157:2021)
Détermination de la teneur en groupes silanol à la surface de la silice pyrogénée -
Méthode par analyse chromatographique en phase gazeuse des gaz de réaction (ISO
23157:2021)
Ta slovenski standard je istoveten z: EN ISO 23157:2022
ICS:
87.060.10 Pigmenti in polnila Pigments and extenders
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN ISO 23157
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2022
EUROPÄISCHE NORM
ICS 87.060.10
English Version
Determination of the silanol group content on the surface
of fumed silica - Reaction gas chromatographic method
(ISO 23157:2021)
Détermination de la teneur en groupes silanol à la Bestimmung des Gehaltes an Silanolgruppen auf der
surface de la silice pyrogénée - Méthode par analyse Oberfläche von pyrogener Kieselsäure -
chromatographique en phase gazeuse des gaz de Gaschromatographisches Verfahren (ISO 23157:2021)
réaction (ISO 23157:2021)
This European Standard was approved by CEN on 9 October 2022.
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 CEN-CENELEC Management Centre 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 CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 23157:2022 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
The text of ISO 23157:2021 has been prepared by Technical Committee ISO/TC 256 "Pigments,
dyestuffs and extenders” of the International Organization for Standardization (ISO) and has been taken
over as EN ISO 23157:2022 by Technical Committee CEN/TC 298 “Pigments and extenders” the
secretariat of which is held by DIN.
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 April 2023, and conflicting national standards shall be
withdrawn at the latest by April 2023.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 23157:2021 has been approved by CEN as EN ISO 23157:2022 without any modification.
INTERNATIONAL ISO
STANDARD 23157
First edition
2021-07
Determination of the silanol group
content on the surface of fumed
silica — Reaction gas chromatographic
method
Reference number
ISO 23157:2021(E)
©
ISO 2021
ISO 23157:2021(E)
© ISO 2021
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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ii © ISO 2021 – All rights reserved
ISO 23157:2021(E)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Reagents . 2
5.1 General . 2
5.2 Toluene . 2
5.3 Grignard reagent . 2
5.4 Reaction solution . 2
5.5 Carrier gas and diluent gas . 2
5.6 Auxiliary gases . 2
5.7 Calibration substance . 2
6 Apparatus . 3
6.1 Gas chromatograph . 3
6.2 Headspace system . 3
6.3 Oven . 3
6.4 Capillary column. 3
6.5 Sample vials . 4
6.6 Analytical balance. 4
6.7 Gas collecting bag . 4
6.8 Syringe. 4
7 Sample pre-treatment and reaction . 4
7.1 Sample pre-treatment . 4
7.1.1 Determination of matter volatile at 105 °C in fumed silica. 4
7.1.2 Preparation of the test sample . 4
7.2 Blank test . 4
7.3 Reaction . 5
7.4 Analysis. 5
7.4.1 Headspace system conditions . 5
7.4.2 Gas chromatographic conditions . 5
7.4.3 Identification . 5
7.4.4 Calibration . 5
7.4.5 Measurement . 6
8 Calculation . 6
8.1 Calculation of the methane quantity produced in the vials . 6
8.2 Calculation of the silanol group content . 7
8.2.1 Calculation of fumed silica volatile at 105 °C . 7
8.2.2 Calculation of the silanol group content on the surface of fumed silica . 7
9 Expression of results . 7
10 Precision . 7
10.1 General .
...
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