SIST EN ISO 6978-2:2005 PDF

Natural gas - Determination of mercury - Part 2: Sampling of mercury by amalgamation on gold/platinum alloy (ISO 6978-2:2003)

Название (английский):

SIST EN ISO 6978-2:2005

Natural gas - Determination of mercury - Part 2: Sampling of mercury by amalgamation on gold/platinum alloy (ISO 6978-2:2003)

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 19
Дата публикации:: 1 июля 2005 г.
ICS:: 75.060
Технический комитет:: NAD - Petroleum products, lubricants and related products

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Описание (английский):

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.

Технические детали

SKU: SIST EN ISO 6978-2:2005

Abstract

Overview

EN ISO 6978-2:2005 (ISO 6978-2:2003) defines a standardized sampling method for the determination of total mercury in pipeline-quality natural gas by amalgamation on a gold/platinum (Au/Pt) alloy thread. The method is intended for dry or non‑condensing natural gas and uses double amalgamation followed by instrumental measurement of mercury vapour absorbance or fluorescence at 253.7 nm (AAS or AFS). It specifies sampling, sample handling, transfer and analytical procedures and gives working concentration ranges for both atmospheric and high‑pressure sampling.

Key Topics and Requirements

Scope and limits: Applicable when no condensation is present. Detection ranges:
- Atmospheric pressure: 0.01 µg/m3 to 100 µg/m3
- High pressure (up to 8 MPa): 0.001 µg/m3 to 1 µg/m3
Sampling principle: Gas passed through two quartz sampling tubes in series containing fine Au/Pt alloy thread. Mercury is collected by amalgamation, desorbed by heating and transferred to an analytical tube (double amalgamation) then measured by AAS or AFS at 253.7 nm.
Sampling conditions: Perform sampling at a temperature at least 10 °C above the gas dewpoint to avoid condensation and bias.
Thermal desorption: Typical desorption temperatures given - sampling tubes heated to around 700 °C, analytical tube to 800 °C for transfer to instrument.
Timing: To avoid diffusion into the alloy and loss of recovery, collected mercury should be determined within one week of sampling.
Apparatus & traceability: Specifies heated bypass valves, flow control, alloy‑filled quartz tubes, flow meters and a gas meter. Volume, temperature and pressure measurements must be traceable; recommended uncertainty for volume measurement is **

Overview

Key Topics and Requirements

Scope and limits: Applicable when no condensation is present. Detection ranges:
- Atmospheric pressure: 0.01 µg/m3 to 100 µg/m3
- High pressure (up to 8 MPa): 0.001 µg/m3 to 1 µg/m3
Sampling principle: Gas passed through two quartz sampling tubes in series containing fine Au/Pt alloy thread. Mercury is collected by amalgamation, desorbed by heating and transferred to an analytical tube (double amalgamation) then measured by AAS or AFS at 253.7 nm.
Sampling conditions: Perform sampling at a temperature at least 10 °C above the gas dewpoint to avoid condensation and bias.
Thermal desorption: Typical desorption temperatures given - sampling tubes heated to around 700 °C, analytical tube to 800 °C for transfer to instrument.
Timing: To avoid diffusion into the alloy and loss of recovery, collected mercury should be determined within one week of sampling.
Apparatus & traceability: Specifies heated bypass valves, flow control, alloy‑filled quartz tubes, flow meters and a gas meter. Volume, temperature and pressure measurements must be traceable; recommended uncertainty for volume measurement is **

SIST EN ISO 6978-2:2005 PDF

Технические детали

Abstract

Overview

Key Topics and Requirements

Похожие стандарты

Abstract

Overview

Key Topics and Requirements

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