BS ISO 21400:2018:2019 Edition
$167.15
Pulp. Determination of cellulose nanocrystal sulfur and sulfate half-ester content
| Published By | Publication Date | Number of Pages |
| BSI | 2019 | 36 |
This document specifies procedures for the laboratory determination of the total elemental sulfur and the sulfate half-ester content of cellulose nanocrystals (CNCs) by inductively coupled plasma-optical emission spectroscopy and conductometric titration, respectively, including sample preparation, measurement methods and data analysis.
This document is applicable to the characterization of CNCs:
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with all monovalent counterions (particularly hydronium and sodium cations);
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which are either in the never-dried state in aqueous suspension, or have been redispersed from a dried form; and
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which have been extracted from any naturally occurring cellulose source using a range of sulfuric acid hydrolysis conditions, or have been sulfated post-hydrolysis using sulfuric acid.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | National foreword |
| 6 | Foreword |
| 7 | Introduction |
| 9 | 1 Scope 2 Normative references 3 Terms and definitions |
| 11 | 4 Symbols and abbreviated terms |
| 12 | 5 Total elemental sulfur content — ICP-OES method 5.1 Principle |
| 13 | 5.2 Reagents and apparatus |
| 14 | 5.3 Sample purification by dialysis |
| 16 | 5.4 Microwave-assisted sample digestion and sample preparation |
| 18 | 5.5 Preparation of calibration solutions and blanks |
| 19 | 5.6 Analysis of standards and samples by ICP-OES |
| 20 | 5.7 Calculation of dry CNC total elemental sulfur content and CNC surface charge |
| 21 | 5.8 Test report 6 Sulfate half-ester content — Conductometric titration method 6.1 Principle 6.2 Reagents and apparatus |
| 23 | 6.3 Sample purification by dialysis |
| 24 | 6.4 Sample protonation by ion exchange |
| 25 | 6.5 Sample analysis by conductometric titration |
| 26 | 6.6 Calculation of dry CNC sulfate half-ester content and CNC surface charge |
| 28 | 6.7 Test report |
| 29 | Annex A (normative) Sample digestion by wet ashing |
| 31 | Annex B (normative) Sample protonation by batch treatment with ion exchange resin |
| 32 | Annex C (informative) Precision |
| 34 | Bibliography |
