BS EN ISO 23157:2022:2023 Edition

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Determination of the silanol group content on the surface of fumed silica. Reaction gas chromatographic method

Published By	Publication Date	Number of Pages
BSI	2023	22

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Categories: 87.060.10 - Pigments and extenders, BSI

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PDF Catalog

PDF Pages	PDF Title
2	undefined
4	European foreword Endorsement notice
7	Foreword
8	Introduction
9	1 Scope 2 Normative references 3 Terms and definitions 4 Principle
10	5 Reagents 5.1 General 5.2 Toluene 5.3 Grignard reagent 5.4 Reaction solution 5.5 Carrier gas and diluent gas 5.6 Auxiliary gases 5.7 Calibration substance
11	6 Apparatus 6.1 Gas chromatograph 6.2 Headspace system 6.3 Oven 6.4 Capillary column
12	6.5 Sample vials 6.6 Analytical balance 6.7 Gas collecting bag 6.8 Syringe 7 Sample pre-treatment and reaction 7.1 Sample pre-treatment 7.1.1 Determination of matter volatile at 105 °C in fumed silica 7.1.2 Preparation of the test sample 7.2 Blank test
13	7.3 Reaction 7.4 Analysis 7.4.1 Headspace system conditions 7.4.2 Gas chromatographic conditions 7.4.3 Identification 7.4.4 Calibration
14	7.4.5 Measurement 8 Calculation 8.1 Calculation of the methane quantity produced in the vials
15	8.2 Calculation of the silanol group content 8.2.1 Calculation of fumed silica volatile at 105 °C 8.2.2 Calculation of the silanol group content on the surface of fumed silica 9 Expression of results 10 Precision 10.1 General 10.2 Repeatability limit, r
16	10.3 Reproducibility limit, R 11 Test report
17	Annex A (informative) Representative chromatogram of methane
18	Annex B (informative) Information about precision
19	Bibliography