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GB/T 11060.4-2017 PDF English

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GB/T 11060.4-2017: Natural gas -- Determination of sulfur compound -- Part 4: Determination of total sulfur content by oxidative micro-coulometry method
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GB/T 11060.4: Evolution and historical versions

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GB/T 11060.4-2017English150 Add to Cart 0-9 seconds. Auto-delivery Natural gas -- Determination of sulfur compound -- Part 4: Determination of total sulfur content by oxidative micro-coulometry method Valid
GB/T 11060.4-2010English358 Add to Cart 1 day Natural gas -- Determination of sulfur compound -- Part 4: Determination of total sulfur content by oxidative microcoulometry method Obsolete

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GB/T 11060.4-2017: Natural gas -- Determination of sulfur compound -- Part 4: Determination of total sulfur content by oxidative micro-coulometry method


---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT11060.4-2017
GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 75.060 E 24 Replacing GB/T 11060.4-2010 Natural gas - Determination of sulfur compound – Part 4. Determination of total sulfur content by oxidative microcoulometry method (ISO 16960.2014, Natural gas - Determination of sulfur compounds - Determination of total sulfur by oxidative microcoulometry method, MOD) Issued on: DECEMBER 29, 2017 Implemented on: JULY 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 .. 6 2 Normative references . 6 3 Test principles . 6 4 Reagents . 7 5 Instruments .. 7 6 Test preparation . 8 7 Test procedures .. 10 8 Calculation . 10 9 Precision. 12 Foreword GB/T 11060 “Natural gas - Determination of sulfur compound” is divided into the following 12 parts. - Part 1. Determination of hydrogen sulfide content by iodometric titration method; - Part 2. Determination of hydrogen sulfide content by methylene blue method; - Part 3. Determination of hydrogen sulfide content by lead acetate reaction rate dual photo path method; - Part 4. Determination of total sulfur content by oxidative microcoulometry method; - Part 5. Determination of total sulfur content by hydrogenolysis and rateometric colorimetry method; - Part 6. Determination of hydrogen sulfide, mercaptan sulfur and carbonyl sulfide sulfur by potentiometry; - Part 7. Determination of total sulfur content by Lingener combustion method; - Part 8. Determination of total sulfur content by ultraviolet fluorescence method; - Part 9. Determination of mercaptan sulfur content by iodometric titration method; - Part 10. Determination of sulfur compounds using gas chromatography method; - Part 11. Determination of mercaptan sulfur content by iodometric titration method; - Part 12. Determination of hydrogen sulfide content by laser absorption spectroscopy. This part is part 4 of GB/T 11060. This part was drafted in accordance with the rules given in GB/T 1.1-2009. This part is an amendment to GB/T 11060.4-2010 “Natural gas - Determination of sulfur compound - Part 4. Determination of total sulfur content by oxidative microcoulometry method”. As compared with GB/T 11060.4-2010, in addition to editorial changes, the main technical changes of this part are as follows. Natural gas - Determination of sulfur compound – Part 4. Determination of total sulfur content by oxidative microcoulometry method Warning - This part does not cover all safety issues related to its application. Before using this part, the user is responsible for formulating corresponding safety and protection measures, and defining the scope of application.

1 Scope

This part of GB/T 11060 specifies the test method of using the microcoulometry method for the determination of total sulfur in natural gas. This part applies to the determination of total sulfur in natural gas. The measurement range is 1 mg/m3 ~ 200 mg/m3, and the measurement range can be extended to higher concentrations by dilution.

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 standard. GB/T 6682 Water for analytical laboratory use - Specification and test methods (GB/T 6682-2008, ISO 3696.1987, MOD) GB/T 8170 Rules of rounding off for numerical values & expression and judgement of limiting values GB/T 13609 Natural gas sampling guidelines (GB/T 13609-2017, ISO 10715.1997, MOD)

3 Test principles

Sulfur-containing natural gas is mixed and combusted with oxygen in a quartz conversion tube, the sulfur is converted into sulfur dioxide, which enters the titration tank with nitrogen and reacts with iodine. Iodine consumed is supplemented by electrolytic potassium iodide. In accordance with the Faraday's law of electrolysis, the amount of sulfur in the sample is calculated from the amount of electricity consumed by the electrolysis and calibrated with a gas reference material.

4 Reagents

4.1 Deionized water. Meets the specifications of level II water in GB/T 6682. 4.2 Potassium iodide. Analytically pure. 4.3 Glacial acetic acid. Analytically pure. 4.4 Oxygen. Volume fraction not less than 99.99%. 4.5 Nitrogen. Volume fraction is not less than 99.99%. 4.6 Gas reference materials. It is recommended to use the hydrogen sulfide gas reference material in methane or nitrogen, or use the thiocarbon-oxygen gas reference material in methane or nitrogen, which has certificate or analysis report. The sulfur content of the gas reference material is as close as possible to the sulfur concentration in the sample to be measured.

5 Instruments

5.1 Converter. it has three separate heating stage (combustion stage, preheating stage and outlet stage) or one heating stage (combustion stage). 5.2 Titration cell. A pair of electrolysis electrodes and a pair of indication reference electrodes are inserted in the cell. 5.3 Microcoulometer. When sulfur dioxide enters the titration cell and the concentration of iodine in the cell is reduced, it can automatically (or manually) perform contact electrolysis, to restore the iodine to its original level, automatically record the electrolysis time and current, finally display the sulfur content directly. The microcoulometer shall have a clear response to 1 ng of sulfur. 5.4 Flow controller. 5.5 Electromagnetic stirrer. 5.6 Quartz conversion tube. 5.7 Needle valve. 5.8 Medical syringes. 0.25 mL, 1 mL, 2 mL and 5 mL each, which shall have a ascertained, and re-measurement shall be performed.

7 Test procedures

7.1 Sampling 7.1.1 Sampling from natural gas pipelines It is performed in accordance with GB/T 13609. 7.1.2 Sampling from gas cylinder USE the sample to rinse the syringe for 3 to 5 times before formal sampling. During sampling, it shall use the gas pressure in the bottle to push the syringe core to the desired scale, then insert the instrument inlet, so that the sample enters within 3 s ~ 5 s. The injection volume should be controlled between 0.25 mL ~ 5 mL. 7.1.3 Sampling from airbags USE the sample to rinse the syringe for 3 to 5 times before formal sampling. During sampling, it shall press the airbag to use the gas pressure in the airbag to push the syringe core to the desired scale, then insert the instrument inlet, so that the sample enters within 3 s ~ 5 s. The injection volume should be controlled between 0.25 mL ~ 5 mL. 7.2 Injection and determination SWITCH the measurement method to the sample measurement state, ENTER the sample injection volume (calibration volume), MAKE determination against the sample in accordance with the method in 6.7.1, then the instrument can display the total sulfur concentration in the sample. When the total sulfur content in the sample is higher than the measuring range of the instrument, the sample can be diluted before measurement. It shall describe the dilution methods in the test report.

8 Calculation

8.1 Volume conversion 8.1.1 Volume of wet base gas The volume conversion of the wet base gas sample is performed in accordance with the formula (1). ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.


      

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