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GB/T 33647-2017 English PDF (GBT33647-2017)

GB/T 33647-2017 English PDF (GBT33647-2017)

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GB/T 33647-2017: Determination of silicon content in motor gasoline -- Inductively coupled plasma optical emission spectrometry (ICP-OES)

This Standard specifies the test method of adopting the inductively coupled plasma optical emission spectrometry (ICP-OES) to determine the silicon content in motor gasoline. This Standard is applicable to determine the silicon content of 1.0mg/kg ~ 50.0mg/kg in the motor gasoline (the volume fraction of oxygen-containing compounds shall not exceed 15%), such as motor gasoline containing methyl tert-butyl ether, motor methanol gasoline (M15) and motor ethanol gasoline (E10). For the motor gasoline sample with silicon content higher than 50.0mg/kg, it can be diluted by the isooctane with higher proportion, then determine according to this Standard method; but its precision has not been statistics yet.
GB/T 33647-2017
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 75.160.20
E 30
Determination of Silicon Content in Motor Gasoline
?€? Inductively Coupled Plasma Optical
Emission Spectrometry (ICP-OES)
ISSUED ON. MAY 12, 2017
IMPLEMENTED ON. DECEMBER 1, 2017
Issued by. General Administration of Quality Supervision, Inspection and Quarantine;
Standardization Administration of PRC.
3. No action is required - Full-copy of this standard will be automatically & immediately delivered to your EMAIL address in 0~60 minutes.
Table of Contents
Foreword ... 3
Introduction ... 4
1 Scope ... 5
2 Normative References ... 5
3 Method Summary ... 6
4 Interference ... 6
5 Apparatus ... 6
6 Reagents and Materials ... 7
7 Sampling ... 8
8 Preparation of Standard Solution and Specimen Solution ... 8
9 Apparatus Preparation ... 8
10 Calibration ... 9
11 Test Procedures ... 9
12 Result Calculation ... 10
13 Quality Control ... 10
14 Precision ... 10
15 Test Report ... 11
Bibliography ... 12
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 Petroleum Products and Lubricants (SAC/TC 280).
Drafting organizations of this Standard. National Quality Supervision & Testing Center for Petroleum and Petrochemical Products (Guangdong), National Petroleum Products Quality Supervision and Inspection Center (Shenyang), Northeast Marketing Branch of PetroChina Co., Ltd., Sinopec Research Institute of Petroleum Processing, and PetroChina Petrochemical Research Institute.
Chief drafting staffs of this Standard. Wen Huan, Zhang Wenmei, Lv Huanming, Yang Lihua, Gao Ping, Wang Ke, He Jing, and Liu Huiqin.
Determination of Silicon Content in Motor Gasoline
?€? Inductively Coupled Plasma Optical
Emission Spectrometry (ICP-OES)
1 Scope
This Standard specifies the test method of adopting the inductively coupled plasma optical emission spectrometry (ICP-OES) to determine the silicon content in motor gasoline.
This Standard is applicable to determine the silicon content of 1.0mg/kg ~ 50.0mg/kg in the motor gasoline (the volume fraction of oxygen-containing compounds shall not exceed 15%), such as motor gasoline containing methyl tert-butyl ether, motor methanol gasoline (M15) and motor ethanol gasoline (E10). For the motor gasoline sample with silicon content higher than 50.0mg/kg, it can be diluted by the isooctane with higher proportion, then determine according to this Standard method; but its precision has not been statistics yet.
When testing according to this Standard, some elements in the motor gasoline like sulfur, lead, iron, manganese, phosphorus and chlorine shall not interfere the determination results of the silicon content.
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 17476 Standard Test Method for Determination of Additive Elements, Wear Metals, and Contaminants in Used Lubricating Oils and Determination of Selected Elements in Base Oils by Inductively Coupled Plasma Optical Emission
Spectrometry
NOTE. When using different types of atomizers, it may affect the determination results of the silicon content.
5.3 Peristaltic pump (recommended)
In order to provide stable sample injection operation, it is recommended to use peristaltic pump for sample injection, the pump speed range is of 0.5mL/min ~ 3mL/min. 5.4 Sample injection tube of peristaltic pump
The use of sample injection tube of peristaltic pump shall ensure when contact with the organic solvent (diluent) for at least 6h, it is exempted from swelling, dissolving, deforming, hardening, and the like appearance changes; it is recommended to use synthetic rubber tube.
5.5 Specimen container
30mL ~ 120mL plastic bottle or glass bottle with threaded cap.
5.6 Balance
Accurate to 0.0001g.
6 Reagents and Materials
6.1 Isooctane. analytically pure.
6.2 Silicon organic standard material. prepare or purchase the silicon organic standard solution with concentration no less than 500mg/kg; for instance, dilute the hexamethyldisiloxane with purity greater than 99% with isooctane, then prepare the 1000mg/kg silicon organic standard solution.
NOTE. for the motor gasoline sample with silicon content greater than 100mg/kg, it is more suitable to use hexamethyldisiloxane as standard material; while the base oil-based silicon organic standard solution may result in higher test results.
6.3 Argon, oxygen. purity no less than 99.995% (volume fraction).
6.4 10% (mass fraction) nitric acid solution.
6.5 Quality control (QC) sample. select the motor gasoline with the similar silicon content as to-be-tested motor gasoline as the quality control sample, it can also be obtained by diluting the proper amount of silicon organic standard material with isooctane. The quality control sample is recommended to seal in the glass bottle with threaded cap, and store in the dark at less than 10??C environment.
11.2 The blank solution and specimen solution shall be measured for three repeated times. The average blank response value shall be subtracted from the signal response value of each specimen solution before determining the average response value of silicon in the specimen solution.
12 Result Calculation
The silicon content X [in (mg/kg)] in the motor gasoline sample shall be calculated by Formula (1).
Where.
Ic ?€? average response value of silicon in specimen solution;
Ibk ?€? average response value of blank solution;
S ?€? standard curve slope (kg/mg);
Kg ?€? mass dilution factor, namely, sample mass/ total mass of sample plus dilution solvent (g/g).
13 Quality Control
13.1 Determine the quality control sample?€?s average value and control limit before use the quality control sample.
13.2 It is recommended to use quality control sample to check once every day when the sample is measured. When measuring large quantities of samples, increase the inspection frequency of quality control sample.
13.3 If the obtained results exceed the control limit, in order to ensure the accuracy of the test results, re-calibrate the instrument and re-measure the sample. 14 Precision
14.1 Overview
According to the method in GB/T 6683, the precision of this Standard was obtained through the test results of 5 motor gasoline samples with silicon content of 1.0mg/kg ~ 50.0kg/mg in 12 collaborative laboratories. The instruments used in the collaborative laboratories are equipped with oxygenating device and atomization chamber cooling

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