{"id":361597,"date":"2024-10-20T01:36:43","date_gmt":"2024-10-20T01:36:43","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/bs-iso-217412020\/"},"modified":"2024-10-26T02:29:59","modified_gmt":"2024-10-26T02:29:59","slug":"bs-iso-217412020","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/bsi\/bs-iso-217412020\/","title":{"rendered":"BS ISO 21741:2020"},"content":{"rendered":"

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<\/sup>) and oxidized (Hg2+<\/sup>) 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+<\/sup>) in the vapour phase is converted to elemental mercury (Hg0<\/sup>) 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.<\/p>\n

The total concentration of mercury in flue gas is expressed as the sum of both gaseous and particulate mercury concentrations.<\/p>\n

The gold amalgamation method is intended for short-term (periodic) measurements of gaseous mercury ranging from 0,01 ?g\/m3<\/sup> to 100 ?g\/m3<\/sup> with sampling volumes from 0,005 m3<\/sup> to 0,1 m3<\/sup> 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<\/sup> to 100 ?g\/m3<\/sup> with sampling volume from 0,05 m3<\/sup> to 1 m3<\/sup>.<\/p>\n

PDF Catalog<\/h4>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
PDF Pages<\/th>\nPDF Title<\/th>\n<\/tr>\n
2<\/td>\nundefined <\/td>\n<\/tr>\n
7<\/td>\nForeword <\/td>\n<\/tr>\n
8<\/td>\nIntroduction <\/td>\n<\/tr>\n
9<\/td>\n1 Scope
2 Normative references <\/td>\n<\/tr>\n
10<\/td>\n3 Terms and definitions
4 Symbols and abbreviated terms
4.1 Symbols <\/td>\n<\/tr>\n
12<\/td>\n4.2 Abbreviated terms
5 Principle
6 Reagents
6.1 General <\/td>\n<\/tr>\n
13<\/td>\n6.2 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 <\/td>\n<\/tr>\n
14<\/td>\n6.12 Trapping agent of mercury
7 Apparatus
7.1 General
7.1.1 Main-stream sampling <\/td>\n<\/tr>\n
16<\/td>\n7.1.2 Side-stream sampling <\/td>\n<\/tr>\n
17<\/td>\n7.2 Nozzle
7.3 Filter and filter housing <\/td>\n<\/tr>\n
18<\/td>\n7.4 Transfer line
7.5 Pretreatment unit <\/td>\n<\/tr>\n
19<\/td>\n7.6 Gold amalgamation trap
7.7 Drying unit
7.8 Suction unit
7.9 Thermometer <\/td>\n<\/tr>\n
20<\/td>\n7.10 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 <\/td>\n<\/tr>\n
21<\/td>\n8.4 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 <\/td>\n<\/tr>\n
22<\/td>\n8.7 Checking for leaks
8.8 Quality assurance
8.9 Sample recovery <\/td>\n<\/tr>\n
23<\/td>\n8.10 Reagent blank
8.11 Field blank
9 Sample preparation
9.1 General
9.2 Sample preparation for particulate mercury analysis <\/td>\n<\/tr>\n
24<\/td>\n10 Analytical procedure
10.1 Analytical procedure for mercury collected with gold amalgamation trap <\/td>\n<\/tr>\n
25<\/td>\n10.2 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 <\/td>\n<\/tr>\n
26<\/td>\n11.2 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 <\/td>\n<\/tr>\n
28<\/td>\n11.4 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 <\/td>\n<\/tr>\n
29<\/td>\n11.7 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 <\/td>\n<\/tr>\n
30<\/td>\n13 Test report <\/td>\n<\/tr>\n
32<\/td>\nAnnex A (informative) Preparation of mercury reference gas <\/td>\n<\/tr>\n
35<\/td>\nAnnex B (informative) Results of evaluation of measurement uncertainties <\/td>\n<\/tr>\n
37<\/td>\nAnnex C (informative) Comparison of analytical results obtained with heated solid catalytic reduction unit and stannous chloride solution unit <\/td>\n<\/tr>\n
39<\/td>\nAnnex D (informative) Comparison of analytical results obtained with this method and EN 13211 <\/td>\n<\/tr>\n
41<\/td>\nAnnex E (informative) Interference from sulfur dioxide (SO2) on the recovery of elemental mercury and oxidized mercury <\/td>\n<\/tr>\n
43<\/td>\nBibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

Stationary source emissions. Sampling and determination of mercury compounds in flue gas using gold amalgamation trap<\/b><\/p>\n\n\n\n\n
Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
BSI<\/b><\/a><\/td>\n2020<\/td>\n44<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":361607,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[206,2641],"product_tag":[],"class_list":{"0":"post-361597","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-13-040-40","7":"product_cat-bsi","9":"first","10":"instock","11":"sold-individually","12":"shipping-taxable","13":"purchasable","14":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/361597","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/361607"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=361597"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=361597"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=361597"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}