BS ISO 21400:2018

This standard BS ISO 21400:2018 Pulp. Determination of cellulose nanocrystal sulfur and sulfate half-ester content is classified in these ICS categories:

• 85.040 Pulps

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:

1. with all monovalent counterions (particularly hydronium and sodium cations);

2. which are either in the never-dried state in aqueous suspension, or have been redispersed from a dried form; and

3. 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.