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BS ISO 21741:2020

BS ISO 21741:2020

$167.15

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

Published By Publication Date Number of Pages
BSI 2020 44
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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.

PDF Catalog

PDF Pages PDF Title
2 undefined
7 Foreword
8 Introduction
9 1 Scope
2 Normative references
10 3 Terms and definitions
4 Symbols and abbreviated terms
4.1 Symbols
12 4.2 Abbreviated terms
5 Principle
6 Reagents
6.1 General
13 6.2 Water
6.3 Nitric acid
6.4 Sulfuric acid
6.5 Stannous chloride solution
6.6 Phosphate buffer solution
6.7 Hydrofluoric acid
6.8 Hydrochloric acid
6.9 Mercury stock solution
6.10 Rinse solution
6.11 Sample gas drying agent
14 6.12 Trapping agent of mercury
7 Apparatus
7.1 General
7.1.1 Main-stream sampling
16 7.1.2 Side-stream sampling
17 7.2 Nozzle
7.3 Filter and filter housing
18 7.4 Transfer line
7.5 Pretreatment unit
19 7.6 Gold amalgamation trap
7.7 Drying unit
7.8 Suction unit
7.9 Thermometer
20 7.10 Manometer
7.11 Gas meter
7.12 Flowmeter
7.13 Barometer
8 Sampling
8.1 General
8.2 Sampling position and sampling point
8.3 Sampling duration and sample volume
21 8.4 Other measurements to be made prior to sampling
8.4.1 Volumetric gas flow through duct at the sampling plane
8.4.2 Moisture content of gas
8.4.3 Oxygen content of gas
8.5 Assembly of sampling apparatus
8.6 Sampling
22 8.7 Checking for leaks
8.8 Quality assurance
8.9 Sample recovery
23 8.10 Reagent blank
8.11 Field blank
9 Sample preparation
9.1 General
9.2 Sample preparation for particulate mercury analysis
24 10 Analytical procedure
10.1 Analytical procedure for mercury collected with gold amalgamation trap
25 10.2 Analytical procedure for mercury in rinse solution and digested solution
11 Expression of results
11.1 Calculation of the volume of dry flue gas sampled at sampling conditions
26 11.2 Calculation of the volume of dry flue gas sample normalized to standard temperature and pressure
11.3 Mass concentration of mercury expressed as elemental mercury in the flue gas on a dry basis at STP
28 11.4 Mass concentration of mercury expressed as elemental mercury in the flue gas on a dry basis at STP and reference oxygen volume fraction
11.5 Rate of mass discharge of mercury expressed as elemental mercury
11.6 Mass concentration of mercury expressed as elemental mercury in the flue gas on a wet basis at STP
29 11.7 Mass concentration of mercury expressed as elemental mercury in the flue gas on a wet basis at STP and reference oxygen concentration
12 Performance characteristics
12.1 Detection limits
12.2 Evaluation of measurement uncertainty
30 13 Test report
32 Annex A (informative) Preparation of mercury reference gas
35 Annex B (informative) Results of evaluation of measurement uncertainties
37 Annex C (informative) Comparison of analytical results obtained with heated solid catalytic reduction unit and stannous chloride solution unit
39 Annex D (informative) Comparison of analytical results obtained with this method and EN 13211
41 Annex E (informative) Interference from sulfur dioxide (SO2) on the recovery of elemental mercury and oxidized mercury
43 Bibliography

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BS ISO 21741:2020
$167.15