|
US$359.00 · In stock
Delivery: <= 4 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 16781.1-2017: Natural gas -- Determination of mercury -- Part 1: Sampling of mercury by chemisorption on iodine
Status: Valid GB/T 16781.1: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 16781.1-2017 | English | 359 |
Add to Cart
|
4 days [Need to translate]
|
Natural gas -- Determination of mercury -- Part 1: Sampling of mercury by chemisorption on iodine
| Valid |
GB/T 16781.1-2017
|
| GB/T 16781.1-2008 | English | 719 |
Add to Cart
|
3 days [Need to translate]
|
Natural gas -- Determination of mercury -- Part 1: Sampling of mercury by chemisorption on iodine
| Obsolete |
GB/T 16781.1-2008
|
| GB/T 16781.1-1997 | English | 559 |
Add to Cart
|
4 days [Need to translate]
|
Natural gas--Determination of mercury--Atomic absorption spectrometry
| Obsolete |
GB/T 16781.1-1997
|
PDF similar to GB/T 16781.1-2017
Basic data | Standard ID | GB/T 16781.1-2017 (GB/T16781.1-2017) | | Description (Translated English) | Natural gas -- Determination of mercury -- Part 1: Sampling of mercury by chemisorption on iodine | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | E24 | | Classification of International Standard | 75.060 | | Word Count Estimation | 18,175 | | Date of Issue | 2017-09-07 | | Date of Implementation | 2018-04-01 | | Older Standard (superseded by this standard) | GB/T 16781.1-2008 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | GB/T 16781.1-2017: Natural gas -- Determination of mercury -- Part 1: Sampling of mercury by chemisorption on iodine
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Natural gas - Determination of mercury - Part 1. Sampling of mercury by chemisorption on iodine
ICS 75.060
E24
National Standards of People's Republic of China
Replacing GB/T 16781.1-2008
Natural gas - Determination of mercury content
Part 1. Iodine chemical adsorption sampling method
Part 1.Samplingofmercurybychemisorptiononiodine
(ISO 6978-1.2003, MOD)
2017-09-07 Posted
2018-04-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
China National Standardization Administration released
Directory
Preface Ⅰ
Introduction Ⅱ
1 Scope 1
2 Normative references 1
3 Terms and definitions 1
4 test principle 1
5 instruments 1
6 Reagents and solutions 2
7 sample 9
7.1 General 9
7.2 Sampling steps 10
7.3 Sample Handling 10
8 Determination of mercury 11
8.1 Transfer of mercury to AAS or AFS instruments 11
8.2 Calibration 11
8.3 Blank test 11
Calculate 11
10 precision 12
10.1 General 12
10.2 Repeatability and reproducibility 12
10.3 Uncertainty 12
11 Test Report 12
Appendix A (informative) This section and the main differences ISO 6978-1.2003 14
Foreword
GB/T 16781 "Determination of mercury content in natural gas" is divided into the following two parts.
--- Part 1. Iodine chemical adsorption sampling method;
--- Part 2. Gold/platinum amalgam sampling method.
This section GB/T 16781 Part 1.
This section drafted in accordance with GB/T 1.1-2009 given rules.
This Part replaces GB/T 16781.1-2008 "Determination of mercury content in natural gas - Part 1. Iodine chemical adsorption sampling method."
This section compared with GB/T 16781.1-2008, the main technical changes are as follows.
--- Chapter 4 test principle part of the "mercury in the form of water-soluble complex was alkaline tin salt (II) solution was reduced to elemental mercury"
Amend to read "Mercury in water-soluble complexes reduced to elemental mercury by alkaline tin salts (II) or potassium borohydride solution";
--- 6.4 to restore the solution part, an increase of potassium borohydride reduction solution and carrier solution;
--- 6.5.1 of the contents of the original standard content of "mercury stock solution, the mass concentration ρ (Hg) = 1.000g/L, traceable to the national standard
Quality "to" mercury standard solution, the national secondary or national standard substance, the mass concentration of ρ (Hg) = 1mg/L ~ 1000mg/L,
Priority to use low concentrations of reference material to reduce the error caused by multi-level dilution ";
--- 8.1 Supplement. The use of flow injection and continuous flow system, you can also use the current carrying solution (6.4.3.2) and potassium borohydride also
The original solution (6.4.2), the reduction of mercury compounds to elemental mercury. Mercury is stripped with inert gas and AAS or AFS instruments are used
Detection.
This section uses the redrafted law Amendment uses ISO 6978-1.2003 "Determination of mercury content in natural gas - Part 1. Iodine chemical absorption
Attached sample method ", the main difference with ISO 6978-1.2003 Appendix A
Please note that some of this document may be patentable. The issuing agencies of this document do not bear the responsibility of identifying these patents.
This part of the National Natural Gas Standardization Technical Committee (SAC/TC244) and focal point.
This part of the drafting unit. China Southwest Oil and Gas Field Branch of Natural Gas Research Institute, China's oil and gas quality control and energy measurement
Key Laboratory of Oil Industry Natural Gas Quality Supervision and Inspection Center.
The main drafters of this section. Li Xiaohong, Tu Zhenquan, Luo Qin, Xu Wenxiao, He Bin, Wang Yujie, Zhou Lin, Huang Liming, Chang Honggang, Zhang Yana.
This part replaces the standards previously issued as.
--- GB/T 16781.1-1997, GB/T 16781.1-2008.
Introduction
Natural gas may contain some amount of mercury, which is usually present in elemental form. Need to purify the gas with high mercury content,
This will not only avoid the condensation of mercury during handling and delivery, but also meet the gas sales contract requirements. Natural gas liquefaction regulations can only contain
Low concentration of mercury, this is to avoid serious corrosion problems, such as corrosion of liquefaction equipment aluminum heat exchanger.
The presence of natural gas-containing hydrocarbons, especially low-concentration aromatics, can interfere with atomic absorption spectroscopy (AAS) or atomic fluorescence spectroscopy
(AFS) for the determination of mercury, so the mercury in natural gas can not be directly measured at this time. Therefore, it is necessary to collect mercury to make it fragrant before analysis
Hydrocarbon separation.
The purpose of measuring mercury content is.
--- Monitoring gas quality;
Monitor the removal of mercury from the gas treatment plant.
Several methods have been developed for collecting or enriching mercury from natural gas. Mercury collection from dry natural gas usually does not involve special problems. But in
Mercury sampling should be used when natural gas is close to condensate (see ISO 6570).
The two parts of GB/T 16781 describe the principle of mercury sampling, the provisions of the mercury sampling method and the determination of mercury in natural gas pipelines
General requirements. This section provides iodine impregnated silica gel chemical sampling method, while the second part of the provisions of the gold/platinum alloy amalgam sampling.
Natural gas - Determination of mercury content
Part 1. Iodine chemical adsorption sampling method
Warning - This section does not include all the security issues related to their application. Before using this section, the user has the responsibility to formulate the corresponding
Safety and protection measures, and define the scope of its application.
1 Scope
This section GB/T 16781 specifies the method of iodine impregnated silica gel chemical adsorption sampling method for the determination of mercury in natural gas, sampling pressure
Force up to 40MPa.
This section applies to the determination of natural gas content of 0.1μg/m3 ~ 5000μg/m3 range of mercury.
This section applies to the volume of sample taken hydrogen sulfide less than 20mg; and under the conditions of sampling liquid hydrocarbon condensate total less than
10g/m3 of sample gas. The amount of mercury vapor collected is determined by measuring the absorbance or fluorescence of the mercury vapor at a wavelength of 253.7 nm.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated version applies to this article
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 13609 Natural gas sampling guidelines (GB/T 13609-2012, ISO 10715.1997, EQV)
GB/T 20604 natural gas vocabulary (GB/T 20604-2006, ISO 14532.2001, IDT)
ISO 6570 Natural gas - Determination of potential hydrocarbon content Weighing method (Naturalgas-Determinationofpotentialhy-
drocarbonliquidcontent-Gravimetricmethods)
3 Terms and definitions
GB/T 20604 defined terms and definitions apply to this document.
4 test principle
The gas passes through a glass tube containing iodine-impregnated silica gel. The gas contains elemental mercury and organic mercury compounds [such as dimethylmercury Hg (CH3) 2 or
Mercury in the form of diethylmercury Hg (C2H5) 2] is chemisorbed and the reaction equation is as follows.
Hg I2 → HgI2
Hg (CH3) 2 I2 → HgI2 2CH3I
The resulting mercuric iodide (HgI2) was dissolved in a laboratory with iodinated amine/iodine solution (NH4I/I2) and the hydrocarbon condensate removed by vacuum stripping. To
Mercury in the form of a water-soluble complex is reduced to elemental mercury by an alkaline tin salt (II) or potassium borohydride solution. Mercury is removed from the solution with inert gas
Stripped, the mercury vapor is transferred to a cold atomic absorption spectrometer (AAS) or atomic fluorescence spectrometer (AFS) at a wavelength of 253.7 nm
Determination. In the same way, the final mercury determination was calibrated using a mercury standard solution that was compatible with the matrix solution.
5 instruments
5.1 The parameters that affect the measurement should be traceable to national or international standards. Volumetric measurements (volume, temperature, gas pressure and atmospheric pressure)
|