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GB/T 31776-2015 English PDF (GBT31776-2015)

GB/T 31776-2015 English PDF (GBT31776-2015)

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GB/T 31776-2015: Determination method of methanol content in methanol gasoline for motor vehicles
This Standard specifies the terms and definitions, principle, apparatus, reagents and materials, sampling, test procedures, result calculation and allowable differences for the determination method of methanol content in methanol gasoline for motor vehicles.
GB/T 31776-2015
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 75.160.20
G 60
Determination Method of Methanol Content in
Methanol Gasoline for Motor Vehicles
ISSUED ON. JULY 3, 2015
IMPLEMENTED ON. OCTOBER 1, 2015
Issued by. General Administration of Quality Supervision, Inspection and Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Terms and Definitions ... 4
4 Principle ... 5
5 Apparatus ... 5
6 Reagents and Materials ... 5
7 Sampling ... 6
8 Test Procedures ... 6
9 Result Calculation ... 9
10 Allowable Difference ... 10
Foreword
This Standard was drafted as per the rules specified in GB/T 1.1-2009.
This Standard was proposed by and under the jurisdiction of National
Technical Committee for Standardization of Methanol-Ether Fuel (SAC/TC 414). Drafting organizations of this Standard. National Coal and Coal Chemical Product Quality Supervision and Inspection Center, Shanxi Wharton Co., Ltd., Shanxi Alcohol and Ether Clean Fuel Technical Center, Shaanxi Yanchang Zhongli New Energy Co., Ltd., Beijing Xiongtaoweiye Energy Technology Co., Ltd., Kailuan Energy Chemical Company Limited, and Zhongrunyou New Energy Co., Ltd..
Chief drafting staffs of this Standard. Li Yanru, Wu Yuequ, Xu Ying, Chang Yonglong, Li Jingsheng, Wang Yongmiao, Cui Jianfang, Wang Julin, Zhang Fading, and Fan Shouwei.
Determination Method of Methanol Content in
Methanol Gasoline for Motor Vehicles
Warning. personnel using this Standard shall have hands-on experience in formal laboratory. This Standard doesn’t address all possible safety issues. Users shall assume the responsibilities to take appropriate safety and
preventative measures, and ensure the compliance with the relevant national regulations.
1 Scope
This Standard specifies the terms and definitions, principle, apparatus, reagents and materials, sampling, test procedures, result calculation and allowable differences for the determination method of methanol content in methanol gasoline for motor vehicles. This Standard is not applicable to the determination of methanol content (volume fraction) in the ethanol-free methanol gasoline for motor vehicles.
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) are applicable to this document.
GB/T 4756 Method for Manual Sampling of Petroleum Liquids
GB/T 9722 Chemical Reagent - General Rules for the Gas Chromatography
GB 17930 Gasoline for Motor Vehicles
GB/T 22030 Blend stocks of Ethanol Gasoline for Motor Vehicles
3 Terms and Definitions
The following terms and definitions are applicable to this document.
3.1 Component oil
6.2 Absolute ethanol. chromatographically pure.
6.3 Component oil. conform to GB 17930 or GB/T 22030.
6.4 Carrier gas. nitrogen with purity no less than 99.99% (volume fraction). 6.5 Fuel gas. hydrogen with purity no less than 99.99% (volume fraction). 6.6 Air. air generator.
6.7 Separator-funnel. pear-shaped, 250mL.
6.8 Pipette. 50mL, 20mL, 10mL, 5mL, 1mL.
6.9 Measuring pipette. 10mL, sub-scale value 0.1mL.
6.10 Measuring pipette. 1mL, sub-scale value 0.01mL.
6.11 Preparation of chromatography column. inject the 60 mesh ~80 mesh Porapak T packed column into the chromatography column with length 1m, and inner diameter 3mm; gently shake during the adding process, so that the filling materials can be filled tightly; both ends of the column shall reserve 2cm, where the glass wool shall be filled, so that ensure the filling materials can’t overflow.
Prior to use, conduct the aging operation against the column when the column box temperature is at 180°C till the instrument baseline is stable.
7 Sampling
7.1 Sampling as per the procedure stipulated in GB/T 4765, take 2L of sample for inspection and retention sample use.
7.2 Sample shall be stored at 0°C~5°C.
7.3 Before analysis, shake the sample thoroughly to see if the sample has significant phase separation. If so, discard the sample; re-sampling is required.
8 Test Procedures
8.1 Sample preparation
When analyzing, the sample, internal standard substance (6.2), distilled water and the container weighing the sample are required to be equilibrated at certain temperature. 8.2 Chromatographic analysis
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