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  • BSI
    BS ISO 21741:2020 Stationary source emissions. Sampling and determination of mercury compounds in flue gas using gold amalgamation trap
    Edition: 2020
    $442.60
    / user per year

Description of BS ISO 21741:2020 2020

This document describes a method for the sampling and measurement of mercury of both vapour and solid phases on stationary source flue gas streams. Mercury generally exists as elemental (Hg0) and oxidized (Hg2+) forms, both in the vapour and solid phases in flue gases. The vapour-phase (gaseous) mercury is captured either isokinetically or non-isokinetically with a gold amalgamation trap after removing solid-phase (particulate) mercury with a filter. Because gold amalgamation trap captures only gaseous elemental mercury, the oxidized mercury (Hg2+) in the vapour phase is converted to elemental mercury (Hg0) prior to the gold amalgamation trap. The concentration of gaseous mercury is determined using atomic absorption spectrometry (AAS) or atomic fluorescence spectrometry (AFS) after releasing mercury by heating the gold amalgamation trap. Separately, particulate mercury is collected isokinetically on a filter and the concentration is determined using cold vapour AAS or cold vapour AFS after dissolving the particulate mercury into solution.

The total concentration of mercury in flue gas is expressed as the sum of both gaseous and particulate mercury concentrations.

The gold amalgamation method is intended for short-term (periodic) measurements of gaseous mercury ranging from 0,01 ?g/m3 to 100 ?g/m3 with sampling volumes from 0,005 m3 to 0,1 m3 and sample gas flow rate between 0,2 l/min to 1 l/min. The measurement range of particulate mercury is typically from 0,01 ?g/m3 to 100 ?g/m3 with sampling volume from 0,05 m3 to 1 m3.



Standard NumberBS ISO 21741:2020
TitleStationary source emissions. Sampling and determination of mercury compounds in flue gas using gold amalgamation trap
StatusDefinitive
Publication Date2020-11-20
Identical National Standard OfISO 21741
DescriptorsEmission, Stationary, Mercury, Flue gases, Gold
ICS13.040.40 Stationary source emissions
CommitteeEH/2/1
ISBN978 0 580 95912 7
PublisherBSI
Pages44

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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