Paper - Determination of sulfuric sulfur and semi-ester content of cellulose nanocrystals

Paper - Determination of sulfuric sulfur and semi-ester content of cellulose nanocrystals

Standard Number UNI ISO 21400: 2019
Organization Italian National Unification Italy
Level National
Category Specification
Status
  • MAY 2019 Published
ABSTRACT
The standard specifies the procedures for the determination in the laboratory of the total elemental sulfur and sulfuric semi-sulfur content of cellulose nanocrystals (cellulose nanocrystal CNC) by means of inductively coupled plasma optical emission spectroscopy and conductivity titration, respectively, including the preparation of the sample, measurement methods and data analysis. The standard is applicable to the CNC characterization: a) with all monovalent counterions (particularly hydroxonium and sodium cations); b) which have never been dried in aqueous suspension or which have been redispersed from a dried form; is c) which have been extracted from any naturally occurring cellulose source using a range of sulfuric acid hydrolysis conditions or which have been post-hydrolysis sulfated using sulfuric acid.