GB/T 43418-2023Determination method of components in flax (English PDF)

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents" Drafting.

1 Scope

This document describes methods for the determination of lipid waxes, pectin, hemicellulose, lignin and cellulose as components of flax fiber.

This document is applicable to flax fiber composition in flax beating, flax machine short flax, flax coarse flax and other processing steps before spinning. Testing of ingredients.

2 Normative reference documents

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, the dated quotations For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to this document.

GB/T 5707 Textile linen textile product terminology

GB/T 6682 Specifications and test methods for water used in analytical laboratories

GB/T 11415 Laboratory sintered (porous) filters pore size, classification and grade

3 Terms and definitions

The terms and definitions defined in GB/T 5707 apply to this document.

4 Principles

Use physical or chemical methods to extract the lipid wax, pectin, hemicellulose, lignin and cellulose components of flax fiber or Separation, quantitative analysis of the extracted or separated components using gravimetric analysis or spectrophotometry to obtain flax fiber Content of ingredients.

5 Reagents

Unless otherwise stated, the reagents used in this document are of analytical grade. The water is grade three water that complies with GB/T 6682.

5.1 Acetone, content >=99.5%, CAS number. 67-64-1.

5.2 Sulfuric acid, content 95%~98%, CAS number. 7664-93-9.

5.3 Carbazole ethanol solution (1.5g/L).

5.4 Hot ammonia solution. Add 1.5mL ammonia water (mass fraction 25%~28%) to 73mL boiling water and mix evenly. Ready for use.

5.5 Sodium hydroxide solution (4g/L).

5.6 Sodium hydroxide solution (20g/L).

5.7 Hydrochloric acid aqueous solution (2mol/L).

5.8 Ammonium oxalate solution (5g/L).