ISO 6978-2:2003 PDF

Natural gas — Determination of mercury — Part 2: Sampling of mercury by amalgamation on gold/platinum alloy

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Title (English):

ISO 6978-2:2003

Natural gas — Determination of mercury — Part 2: Sampling of mercury by amalgamation on gold/platinum alloy

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 17
Publication date:: October 24, 2003
Edition:: ISO IS 6978 edition 1 version 1
ICS:: 75.060

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Description (English):

This ISO 6978-2:2003 specifies a method for the determination of total mercury content of pipeline quality natural gas using a sampling method by amalgamation on gold/platinum (Au/Pt) alloy thread. This method is applicable to the sampling of raw natural gas when no condensation is present. At atmospheric pressure, this method is suitable for the determination of mercury content within the range of 0,01 microgram /m3 to 100 micrograms/m3 in natural gas samples. At higher pressures (up to 8 MPa), this sampling method is suitable for the determination of mercury contents within the range of 0,001 microgram/m3 to 1 microgram/m3. The collected mercury is determined by measuring the absorbance or fluorescence of mercury vapour at 253,7 nm.

Technical details

Technical committee: ISO/TC 193/SC 1 - Analysis of natural gas
SKU: ISO 6978-2:2003

Abstract

Overview

ISO 6978-2:2003 - Natural gas - Determination of mercury - Part 2: Sampling of mercury by amalgamation on gold/platinum alloy specifies a validated sampling method for measuring total mercury in pipeline‑quality natural gas. The method collects elemental mercury by amalgamation on a fine gold/platinum (Au/Pt) alloy thread in quartz sampling tubes; collected mercury is thermally desorbed and quantified by cold‑vapor atomic absorption spectrometry (AAS) or atomic fluorescence spectrometry (AFS) at 253.7 nm.

Key scope items:

Applicable to raw natural gas when no condensation is present.
Working ranges:
- At atmospheric pressure: 0.01 µg/m3 to 100 µg/m3
- At elevated pressures (up to 8 MPa): 0.001 µg/m3 to 1 µg/m3
Time constraint: collected mercury should be determined within one week to avoid diffusion losses.
Volumes expressed at 273.15 K and 1013.25 hPa.

Key topics and technical requirements

Sampling principle: Gas passes through two quartz sampling tubes in series containing Au/Pt thread; mercury amalgamates on the thread. Thermal desorption (700 °C then 800 °C double‑amalgamation) releases mercury into an analytical tube and onward to AAS/AFS.
Apparatus essentials: heated sampling block, flow meters, gas meter, high‑pressure vessel (for up to 25 MPa components), tube oven capable of reaching 800 °C within ~2 min, mercury traps, calibrated flow/pressure/temperature instruments.
Analytical performance: AAS/AFS mercury unit should detect at least 0.05 ng Hg; maintain constant carrier flow during analysis.
Calibration and QA: Use a mercury‑saturated air calibration set; perform blank tests and efficiency checks on sampling tubes. Volume measurement uncertainty should be minimized (

Related standards

Other ISO standards

Overview

Key scope items:

Applicable to raw natural gas when no condensation is present.
Working ranges:
- At atmospheric pressure: 0.01 µg/m3 to 100 µg/m3
- At elevated pressures (up to 8 MPa): 0.001 µg/m3 to 1 µg/m3
Time constraint: collected mercury should be determined within one week to avoid diffusion losses.
Volumes expressed at 273.15 K and 1013.25 hPa.

Key topics and technical requirements

Sampling principle: Gas passes through two quartz sampling tubes in series containing Au/Pt thread; mercury amalgamates on the thread. Thermal desorption (700 °C then 800 °C double‑amalgamation) releases mercury into an analytical tube and onward to AAS/AFS.
Apparatus essentials: heated sampling block, flow meters, gas meter, high‑pressure vessel (for up to 25 MPa components), tube oven capable of reaching 800 °C within ~2 min, mercury traps, calibrated flow/pressure/temperature instruments.
Analytical performance: AAS/AFS mercury unit should detect at least 0.05 ng Hg; maintain constant carrier flow during analysis.
Calibration and QA: Use a mercury‑saturated air calibration set; perform blank tests and efficiency checks on sampling tubes. Volume measurement uncertainty should be minimized (

ISO 6978-2:2003 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

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Abstract

Overview

Key topics and technical requirements

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