ISO 21741:2020 固定源排放 用金汞齐陷阱对烟气中汞化合物的取样和测定

标准编号：ISO 21741:2020

中文名称：固定源排放 用金汞齐陷阱对烟气中汞化合物的取样和测定

英文名称：Stationary source emissions — Sampling and determination of mercury compounds in flue gas using gold amalgamation trap

发布日期：2020-11

标准范围

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.
 

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