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GB/T 14571.2-2018 PDF English

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GB/T 14571.2-2018: Test method of ethylene glycol for industrial use - Part 2: Determination of purity and impurities - Gas chromatography
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GB/T 14571.2: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] deliveryName of Chinese StandardStatus
GB/T 14571.2-2018English150 Add to Cart 0-9 seconds. Auto-delivery Test method of ethylene glycol for industrial use - Part 2: Determination of purity and impurities - Gas chromatography Valid
GB/T 14571.2-1993English279 Add to Cart 3 days Monoethylene glycol for industrial use. Determination of diethylene glycol and triethylene glycol. Gas chromatographic method Obsolete

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GB/T 14571.2-2018: Test method of ethylene glycol for industrial use - Part 2: Determination of purity and impurities - Gas chromatography


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NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 71.080.60 G 16 Replacing GB/T 14571.2-1993 Test method of ethylene glycol for industrial use - Part 2.Determination of purity and impurities - Gas chromatography Issued on. MARCH 15, 2018 Implemented on. OCTOBER 01, 2018 Issued by. General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the People's Republic of China.

Table of Contents

Foreword... 3 1 Scope... 5 2 Normative references... 5 3 Principle... 6 4 Reagents or materials... 6 5 Instruments and devices... 7 6 Sample... 7 7 Test steps... 8 8 Processing of test data... 10 9 Precision... 11 10 Quality assurance and control... 12 11 Test report... 12

Foreword

GB/T 14571 consists of the following parts. GB/T 14571.1, Test method of ethylene glycol for industrial use - Part 1. Determination of acidity - Titration method GB/T 14571.2, Test method of ethylene glycol for industrial use - Part 2. Determination of purity and impurities - Gas chromatography GB/T 14571.3, Ethylene glycol for industrial use - Determination of content of total aldehydes present - Spectrophotometric method GB/T 14571.4, Ethylene glycol for industrial use - Determination of ultraviolet transmittance - Ultraviolet spectrophotometric method GB/T 14571.5, Test method of ethylene glycol for industrial use - Part 5. Determination of chloride ion - Ion chromatography This Part is Part 2 of GB/T 14571. This Part was drafted in accordance with the rules given in GB/T 1.1-2009. This Part replaces GB/T 14571.2-1993 “Ethylene glycol for industrial use. Determination of diethylene glycol and triethylene glycol. Gas chromatographic method”. Compared with GB/T 14571.2-1993, main changes in this Part are as follows. - modified standard’s name; - modified tiles of related clauses (see Clause 3~Clause 11 of this Edition, Clause 3~Clause 9 of Edition 1993); - modified scope (see Clause 1 of this Edition, Clause 1 of Edition 1993); - added relevant standards to normative references (see Clause 2 of this Edition, Clause 2 of Edition 1993); - modified principle (see Clause 3 of this Edition, Clause 3 of Edition 1993); - deleted packing column; deleted capillary column type and chromatographic conditions (see Table 1 of this Edition, Table 1 of Edition 1993); - added calculation of ethylene glycol purity (see Clause 8 of this Edition); - added contents related to determinations of 1,2-propanediol, 1,2-butanediol, 1,4-butanediol, 1,2-hexanediol, ethylene carbonate, and 1,3-dioxane-2- methanol (see Clause 1, Clause 7 and 4.5.2 of this Edition); - modified quantification method from external standard method and internal standard method to corrected area normalization method (see Clause 8 of this Edition, 7.3 and Annex A of Edition 1993); - modified precision data of method (see Table 2 of this Edition, Table 2 of Edition 1993); - added quality assurance and control (see Clause 10 of this Edition); - deleted Annex A (See Annex A of Edition 1993). This Part was proposed by China Petrochemical Corporation. This Part shall be under the jurisdiction of Subcommittee on Petrochemical of National Technical Committee on Chemicals of Standardization Administration of China (SAC/TC 63/SC4). The drafting organization of this Part. China Petroleum & Chemical Corporation Shanghai Petrochemical Research Institute. Main drafters of this Part. Fan Chenliang, Gao Zhirong, Wang Chuan, Zhang Yuhong. Version of standard substituted by this Part is. - GB/T 14571.2-1993. Test method of ethylene glycol for industrial use – Part 2.Determination of purity and impurities – Gas chromatography WARNING. This Part is not intended to describe all security issues related to its use. It is the responsibility of the user to take appropriate safety and health measures to ensure the compliance with relevant national regulations.

1 Scope

This Part of GB/T 14571 specifies principle, reagents or materials, instruments and devices, samples, test procedures, test data processing, precision, quality assurance and control, test report of gas chromatography for determination of purity and impurities in ethylene glycol for industrial use. This Part is applicable to determine the ethylene glycol sample for industrial use of which purity is not less than 98.0% (mass fraction). Where, the detection limit of 1,2-propanediol and triethylene glycol is 0.0020% (mass fraction). The detection limit of 1,3-dioxane-2-methanol, diethylene glycol, 1,2-butanediol, 1,4-butanediol, 1,2-hexanediol and ethylene carbonate is 0.0010% (mass fraction).

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 3723, Sampling of chemical products for industrial use - Safety in sampling GB/T 6678, General Principles for Sampling Chemical Products GB/T 6680, General rules for sampling liquid chemical products

3 Principle

Under specified conditions, inject an appropriate amount of sample into the chromatograph that is equipped with hydrogen flame ionization detector (FID).

4 Reagents or materials

WARNING - Gases in 4.1~4.4 are high-pressure compressed gas or pressurized flammable gas. Most of standard reagents in 4.5 are flammable or toxic liquids. Pay attention to safety in use. 4.1 Carrier gas Helium or nitrogen; purity is not less than 99.99% (volume fraction); dried and purified by silica gel and 5A molecular sieve. 4.4 Auxiliary gas Nitrogen; purity is not less than 99.99% (volume fraction); dried and purified by silica gel and 5A molecular sieve. 4.5 Reagents

5 Instruments and devices

5.1 Gas chromatograph. equipped with hydrogen flame ionization detector. The peak height of the lowest measured concentration of impurities specified in this Part shall be at least twice the noise. Dynamic linear range meets quantitative requirements. 5.3 Analytical balance. resolution is 0.1mg. 5.4 Sample introduction device. 10μL micro syringe or liquid autosampler. 5.5 Recording device. electronic integrator or chromatography workstation.

6 Sample

Perform sampling according to the provisions of GB/T 3723, GB/T 6678, GB/T 6680.

7 Test steps

7.1 Instrument preparation According to the operation instructions of the instrument, install and age the chromatographic column in chromatograph. 7.2 Preparation of calibration solution Use weighing method to prepare the calibration solution that contains high purity ethylene glycol (4.5.1) and impurities to be tested (4.5.2). Each component shall be accurately weighed to 0.0001g. 7.3 Determination of correction factor Under the chromatographic conditions recommended in Table 1, take an appropriate amount of calibration solution (7.2) into chromatograph. Repeat the determination 3 times. See Figure 1 for typical chromatogram. Measure all chromatographic peak areas. If 1,2-propanediol and ethylene glycol are not separated from the baseline, the chromatographic peak of 1,2-propanediol shall be chamfered according to the tailing peak. 7.4 Determination of sample Under the chromatographic conditions recommended in Table 1, take an appropriate amount of sample to be tested into chromatograph.

8 Processing of test data

8.1 Calculation of correction factor Calculate the correction factor (fi) of each impurity relative to ethylene glycol according to formula (1). 8.3 Expression of analysis results For any sample, the content of each component is expressed as the arithmetic mean of the results of two parallel determinations.

9 Precision

9.1 Repeatability In the same laboratory, the same operator uses the same device. According to the same test method, test the same test object independently of each other in a short time. The absolute difference between the two independent test results obtained is not greater than the repeatability limit (r) listed in Table 2.The premise is that the case greater than the repeatability limit (r) does not exceed 5%. 9.2 Reproducibility In any two laboratories, the different operator uses the different device. According to the same test method, test the same test object independently.

10 Quality assurance and control

10.1 The laboratory shall periodically analyze the quality control samples to ensure the accuracy of the test results. 10.2 The quality control sample shall be stable and representative of the sample being analyzed. The quality control sample can use the calibration solution that is self-prepared according to 7.2 or the certified standard solution sold at market.

11 Test report

The report shall contain the following information. ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.


      

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