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BS ISO 21741:2020 Stationary source emissions. Sampling and determination of mercury compounds in flue gas using gold amalgamation trap >
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BS ISO 21741:2020 Stationary source emissions. Sampling and determination of mercury compounds in flue gas using gold amalgamation trap, 2020
- undefined
- Foreword
- Introduction
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Symbols and abbreviated terms
- 4.1 Symbols
- 4.2 Abbreviated terms
- 5 Principle
- 6 Reagents
- 6.1 General
- 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
- 6.12 Trapping agent of mercury
- 7 Apparatus
- 7.1 General
- 7.1.1 Main-stream sampling
- 7.1.2 Side-stream sampling
- 7.2 Nozzle
- 7.3 Filter and filter housing
- 7.4 Transfer line
- 7.5 Pretreatment unit
- 7.6 Gold amalgamation trap
- 7.7 Drying unit
- 7.8 Suction unit
- 7.9 Thermometer
- 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
- 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
- 8.7 Checking for leaks
- 8.8 Quality assurance
- 8.9 Sample recovery
- 8.10 Reagent blank
- 8.11 Field blank
- 9 Sample preparation
- 9.1 General
- 9.2 Sample preparation for particulate mercury analysis
- 10 Analytical procedure
- 10.1 Analytical procedure for mercury collected with gold amalgamation trap
- 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
- 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
- 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
- 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
- 13 Test report
- Annex A (informative) Preparation of mercury reference gas
- Annex B (informative) Results of evaluation of measurement uncertainties
- Annex C (informative) Comparison of analytical results obtained with heated solid catalytic reduction unit and stannous chloride solution unit
- Annex D (informative) Comparison of analytical results obtained with this method and EN 13211
- Annex E (informative) Interference from sulfur dioxide (SO2) on the recovery of elemental mercury and oxidized mercury
- Bibliography [Go to Page]