NF ISO 21741

NF ISO 21741

October 2021
Standard Current

Stationary source emissions - Sampling and determination of mercury compounds in flue gas using gold amalgamation trap

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 μg/m3 to 100 μg/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 μg/m3 to 100 μg/m3 with sampling volume from 0,05 m3 to 1 m3.

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Main informations

Collections

National standards and national normative documents

Publication date

October 2021

Number of pages

41 p.

Reference

NF ISO 21741

ICS Codes

13.040.40   Stationary source emissions

Classification index

X43-122

Print number

2 - 01/03/2022

International kinship

ISO 21741:2020
Sumary
Stationary source emissions - Sampling and determination of mercury compounds in flue gas using gold amalgamation trap

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 μg/m3 to 100 μg/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 μg/m3 to 100 μg/m3 with sampling volume from 0,05 m3 to 1 m3.

Table of contents
  • Avant-propos
  • 1 Domaine d'application
  • 2 Références normatives
  • 3 Termes et définitions
  • 4 Symboles et termes abrégés
  • 5 Principe
  • 6 Réactifs
  • 7 Appareillage
  • 8 Prélèvement
  • 9 Préparation de l'échantillon
  • 10 Mode opératoire d'analyse
  • 11 Expression des résultats
  • 12 Caractéristiques de performances
  • 13 Rapport d'essai
  • Annexe A (informative) Préparation du mercure gazeux de référence
  • Annexe B (informative) Résultats de l'évaluation de l'incertitude de mesure
  • Annexe C (informative) Comparaison des résultats analytiques obtenus en utilisant une unité de réduction catalytique chauffée et une unité de solution de chlorure stanneux
  • Annexe D (informative) Comparaison des résultats analytiques obtenus en utilisant la présente méthode et l'EN
    13211
  • Annexe E- (informative) Interférence du dioxyde de soufre (SO2) sur la récupération du mercure élémentaire et du mercure oxydé
  • Bibliographie
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