GB/T 8038-2023Coking toluene—Determination of hydrocarbon impurities—Gas chromatography (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.

This document replaces GB/T 8038-2009 "Gas Chromatography Method for Determination of Hydrocarbon Impurities in Coked Toluene" and is consistent with GB/T 8038-2009 In comparison, in addition to structural adjustments and editorial changes, the main technical content changes are as follows.

a) Changed the scope content (see Chapter 1, Chapter 1 of the 2009 edition);

b) The requirements for the stationary phase of the internal standard method have been changed (see 5.2.9.1, 5.4.1 of the 2009 edition);

c) The requirements for internal standard method chromatographic columns have been changed (see 5.3.1.5, 6.1.5 of the 2009 edition);

d) Added requirements for material nitrogen (see 5.3.2.3);

e) The standard sieve requirement is deleted (see 6.2.3 of the 2009 version);

f) The calculation formula of the correction factor has been changed (see 5.4.2.3, 7.4.3 of the 2009 version);

g) Increase the typical retention time of each component of FFAP (see Table 3 in 5.4.3.2);

h) Added area normalization method (see Chapter 6);

i) Changed precision requirements (see Chapter 7, Chapter 10 of the 2009 edition).

1 Scope

This document specifies the sampling, principles, reagents, instruments and materials, preparations, and tests for the gas chromatographic determination of hydrocarbon impurities in coked toluene. Test steps, result calculation, precision.

This document is applicable to the determination of hydrocarbon impurities in coked toluene, including benzene, C8 aromatics and non-aromatic hydrocarbons up to n-nonane. Internal standard method for each group The measurement range (mass fraction) of impurities is 0.01%~0.03%; the measurement range (mass fraction) of each group of impurities by area normalization method is 0.002%~1.60%.

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 1999 Sampling method for coked oil products

3 Terms and definitions

There are no terms or definitions to be defined in this document.

4 Samples

According to the provisions of GB/T 1999, a representative sample of no less than 1000mL is randomly taken from a large amount of materials.

5 Method 1 Internal Standard Method