ISO 21400-2018

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Pulp — Determination of cellulose

nanocrystal sulfur and sulfate half-

ester content

Pâte — Détermination de la teneur en soufre et en demi-ester de

sulfate des nanocristaux de cellulose

INTERNATIONAL

STANDARD

ISO

21400

First edition

2018-12

Reference number

ISO 21400:2018(E)





















Website: www.iso.org



ISO 21400:2018(E)

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Termsanddefinitions ..................................................................................................................................................................................... 1

4 Symbols and abbreviated terms ........................................................................................................................................................... 3

5 Total elemental sulfur content — ICP-OES method .......................................................................................................... 4

  ........................................................................................................................................................................................................ 4

  .................................................................................................................................................................. 5

  ................................................................................................................................................. 6

  .................................................................. 8

  ..................................................................................................... 10

  ....................................................................................................... 11

  ......................... 12

5.8 Test report ................................................................................................................................................................................................ 13

6 Sulfate half-ester content — Conductometric titration method ......................................................................13

  ..................................................................................................................................................................................................... 13

  ............................................................................................................................................................... 14

  ..............................................................................................................................................15

  ...............................................................................................................................16

  ............................................................................................................ 

  ..................................... 

  ................................................................................................................................................................................................ 20

Annex A  Sample digestion by wet ashing ...................................................................................................................21

Annex B  Sample protonation by batch treatment with ion exchange resin ...........................23

Annex C  Precision ............................................................................................................................................................................24

Bibliography .............................................................................................................................................................................................................................26

Contents 

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标签： #ISO

摘要：

ISO 21400-2018 是一项国际标准，标题为《纸浆、纸和纸板 — 纤维素纳米纤维的测定方法》，它规定了用于测定悬浮液中纤维素纳米纤维（CNF）含量及特性的测试方法，涵盖固含量、粒径分布、结晶度和表面电荷密度等关键参数。该标准为纸浆和造纸行业提供了统一的质量控制与检测规范，支持纳米纤维素产品的研发与应用，适用于实验室质量控制、产品验证及进出口贸易中的合规检验。通过遵循ISO 21400-2018，企业可以确保其纤维素纳米纤维材料的一致性、可靠性和可重复性，从而推动高端功能性纸张、包装材料以

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ISO 21400-2018

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