HS/T 50-2016Quantitative analysis of the aromatics in hydrocarbons (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009,

HS/T 1-2011 and HS/T 39-2013.

This standard uses the redrafting method to modify and adopt U0P 744-06 "Gas

Chromatographic Determination of Aromatics in Hydrocarbons".

The technical differences between this standard and UOP 744-06 and the

reasons are as follows.

- MODIFY the scope of application, to be applied to the determination of

hydrocarbons containing aromatic hydrocarbons whose final boiling point

is not higher than 285 °C, so as to clarify the scope of testing products;

- ADD the use of gas chromatography-mass spectrometry, for qualitative

analysis of each component, to meet the technical requirements of customs

supervision and taxation;

- Considering the complex composition of mixed aromatics, the correction

factor of the peak area in this standard is calculated by the effective carbon

number theory instead of the method of preparing the calibration solution,

to simplify the processing steps of the experimental results.

This standard has made the following editorial changes.

- In order to be consistent with the content of the existing standard, CHANGE

the standard name to "Quantitative analysis of the aromatics in

hydrocarbons".

This standard was proposed by the Customs Administration Department of the

General Administration of Customs of the People's Republic of China.

This standard shall be under the jurisdiction of the Department of Policies and

Regulations of the General Administration of Customs of the People's Republic

of China.

Drafting organizations of this standard. Shanghai Customs of the People's

Republic of China, China Standard Technical Service (Shanghai) Co., Ltd.

1 Scope

This standard specifies the instruments and equipment for testing the aromatic

content in hydrocarbons, determination procedures and processing of analysis

results.

2 Normative references

The following documents are essential to the application of this document. For

the dated documents, only the versions with the dates indicated are applicable

to this document; for the undated documents, only the latest version (including

all the amendments) is applicable to this standard.

UOP 744-06 Gas Chromatographic Determination of Aromatics in

Hydrocarbons

3 Principles

The samples are injected into a gas chromatograph-mass spectrometer and a

gas chromatograph which is equipped with an FID detector. Each composition

is qualitatively determined by the GC-Mass total ion chromatogram, then

quantified by the GC-FID chromatogram.

4 Equipment

Gas chromatography-mass spectrometer. It is equipped with mass

spectrometer with E1 source, split/splitless sample inlet, autosampler; equipped

with a data processor or chemistry workstation for acquiring and processing

data.

5 Measurement steps

According to the determination conditions in 5.1, take two parallel samples and

run them on GC-FID and GC-MS, respectively. The retention time and

chromatographic peak area of each component are automatically collected by

the chromatographic data processor. According to the GC-MS total ion

chromatogram, confirm the name of each compound on the GC-MD

chromatogram

6 Analytical results

Using the stepwise analysis of variance method, calculate the standard

deviation within the same day according to the average concentration in Table

C.1 in Appendix C. For two tests conducted by the same analyst in a laboratory

on the same day, the difference cannot exceed the allowable deviation under

the 95% confidence level as shown in Table C.1.

7 Results representations

The analysis result requirements are as follows.

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