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BSI 21/30429402 DC:2021 Edition

BSI 21/30429402 DC:2021 Edition

$13.70

BS ISO 23157. Determination of the silanol group content on the surface of fumed silica. Reaction gas chromatographic method

Published By Publication Date Number of Pages
BSI 2021 19
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This document specifies a method for the determination of the silanol group content on the surface of fumed silica by reaction gas chromatographic method.

PDF Catalog

PDF Pages PDF Title
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
6.5 Sample vials
12 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
8.2 Calculation of the silanol group content
8.2.1 Calculation of fumed silica volatile at 105 °C
15 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
10.3 Reproducibility limit, R
16 11 Test report
17 Annex A (informative) Representative chromatogram of methane
18 Annex B (informative) Information about precision
19 Bibliography

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BSI 21/30429402 DC
$13.70