ISO 5409:2024
(Main)Stationary source emissions — Chemical absorption method for sampling and determining mercury species in flue gas
Stationary source emissions — Chemical absorption method for sampling and determining mercury species in flue gas
This document describes a method for the sampling and determining mercury species in flue gas passing through ducts or chimney stacks. Mercury generally exists in gaseous elemental form, gaseous oxidized form and particulate-bound form. This method applies to the sampling and determination of gaseous elemental mercury (Hg0), gaseous oxidized mercury (Hg2+), particulate-bound mercury (HgP) and total mercury (HgT) in the flue gas from stationary sources. This method is suitable at locations with high dust content, including locations upstream of the dust removal device with high particulate loadings in flue gas up to 120 g/m3. This method is applicable to locations with sulfur dioxide (SO2) concentration up to 0,25 % when the sampling volume is 0,5 m3 (on a dry basis as corrected to standard conditions). The limit of detection and the limit of determination depend on the instrumental limit of detection, reagent blank, field blank, measurement technique and volume of sampled gas. When the sampling volume is 1,5 m3 (on a dry basis as corrected to standard conditions), the expected limits of detection for Hg0, HgP, Hg2+ and HgT are 0,103 μg/m3, 0,011 μg/m3, 0,035 μg/m3 and 0,127 μg/m3, respectively. The expected limits of determination for Hg0, HgP, Hg2+ and HgT are 0,229 μg/m3, 0,025 μg/m3, 0,082 μg/m3 and 0,263 μg/m3, respectively.
Émissions de sources fixes — Échantillonnage et détermination du mercure dans les gaz de combustion en utilisant la méthode d'absorption chimique
General Information
Standards Content (Sample)
International
Standard
ISO 5409
First edition
Stationary source emissions —
2024-11
Chemical absorption method for
sampling and determining mercury
species in flue gas
Émissions de sources fixes — Échantillonnage et détermination
du mercure dans les gaz de combustion en utilisant la méthode
d'absorption chimique
Reference number
© ISO 2024
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Published in Switzerland
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Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Symbols and abbreviated terms. 2
4.1 Symbols .2
4.2 Abbreviated terms .4
5 Principle . 4
6 Reagents . 5
6.1 Purity of reagents .5
6.2 Purity of water . .5
6.3 Reagents .5
7 Apparatus . 6
7.1 General .6
7.2 Nozzle .7
7.3 Probe liner .8
7.4 Probe .8
7.5 Transfer line .8
7.6 Filter .8
7.7 Cyclone separator . .8
7.8 Filter housing .8
7.9 Filter heating box .8
7.10 Absorbing system.9
7.11 Pump . .9
7.12 Thermometer .9
7.13 Manometer .9
7.14 Gas meter .9
7.15 Rotameter .9
7.16 Barometer .9
7.17 Ancillary equipment .9
7.18 Impinger .9
8 Sampling . 10
8.1 Sampling location .10
8.2 Proper differential pressure gauge .10
8.3 Sampling volume .10
8.4 Preparation of the sampling train .10
8.5 Other measurements prior to sampling .10
8.5.1 Volumetric gas flow through duct at the sampling plane .10
8.5.2 Water vapour content .10
8.5.3 Oxygen content .11
9 Calibration and standardization .11
9.1 Calibration of probe nozzle .11
9.2 Calibration of pitot tube .11
9.3 Calibration of metering system .11
9.4 Calibration of thermometer .11
9.5 Leak check of the metering system .11
10 Measurement procedure .11
10.1 Sampling operation .11
10.2 Sample recovery .11
10.2.1 General .11
iii
10.2.2 Recovery of ash sample . 12
10.2.3 Recovery of absorber samples. 12
10.2.4 Recovery of silica gel impinger . 12
10.2.5 Storage of recovered samples . 12
10.3 Sample preparation . 12
10.3.1 Preparation of ash sample . 12
10.3.2 Preparation of solution samples . 13
10.4 Analytical procedures . . 13
10.4.1 Reagent blank . 13
10.4.2 Analytical procedure for mercury in prepared solution . 13
11 Quality assurance/quality control . 14
11.1 General .14
11.2 QA/QC for the sampling .14
11.2.1 Absorbing system .1
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