Speciation of combustion-derived particulate phase arsenic
The speciation of inorganic arsenic compounds produced in pulverized coal combustion was investigated in a bench-scale study conducted under fuel-lean combustion conditions. Results suggest that at temperatures of 850-1100 K, and in the absence of particulate, arsenic initially condenses as As sub(2...
Gespeichert in:
Veröffentlicht in: | Environmental engineering science 2000-11, Vol.17 (6), p.315-327 |
---|---|
Hauptverfasser: | , , , |
Format: | Artikel |
Sprache: | eng |
Schlagworte: | |
Online-Zugang: | Volltext |
Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
container_end_page | 327 |
---|---|
container_issue | 6 |
container_start_page | 315 |
container_title | Environmental engineering science |
container_volume | 17 |
creator | HIRSCH, M. E STERLING, R. O HUGGINS, F. E HELBLE, J. J |
description | The speciation of inorganic arsenic compounds produced in pulverized coal combustion was investigated in a bench-scale study conducted under fuel-lean combustion conditions. Results suggest that at temperatures of 850-1100 K, and in the absence of particulate, arsenic initially condenses as As sub(2)O sub(3) rather than the thermodynamically favored As sub(2)O sub(5). Synthetic fly ash in the form of uniform 0.25 mu m spherical silica particles produced by sol-gel methods, added to the experimental system to simulate the presence of combustion-derived fly ash, did not affect arsenic speciation, nor did doping of the silica particles with small amounts of calcium. As(V) was only observed at these temperatures when calcium was added to the system as calcium acetate, producing a reactive calcium oxide fume and leading to the formation of calcium arsenate. From these results, it was concluded that the formation of arsenic(V) in combustion systems requires either the oxidation of As sub(2)O sub(3), which appears to be a kinetically limited process, or the presence of reactive calcium compounds. Additional experiments conducted with calcium silicate in an isothermal tube furnace suggested that calcium in silicates is capable of reacting with arsenic under long (order minutes) reaction time conditions. The apparent ability of calcium silicate particles to capture arsenic under idealized conditions suggests that calcium embedded in silicate fly ash may be capable of forming calcium arsenate, but the extent of this reaction on the time scales of a pulverized coal combustor or waste incinerator remains unclear. |
doi_str_mv | 10.1089/ees.2000.17.315 |
format | Article |
fullrecord | <record><control><sourceid>proquest_cross</sourceid><recordid>TN_cdi_proquest_miscellaneous_17762047</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>17762047</sourcerecordid><originalsourceid>FETCH-LOGICAL-c298t-12d2b68e33d9c4dcfd6a990eef5eccdd5f702347aad96307441b7152bff9107b3</originalsourceid><addsrcrecordid>eNo9kEtLxDAUhYMoOI6u3RYEd53Js0ncyeALBlyo65AmNxjptDVpBf-9GWZwde-B853Fh9A1wSuClV4D5BXFuCS5YkScoAURQtYaE3VafqxpraRQ5-gi5y-MCeOMLNDd2wgu2ikOfTWEyg27ds77VHtI8Qd8Ndo0RTd3doJq_LQZKpsy9NFdorNguwxXx7tEH48P75vnevv69LK539aOajXVhHraNgoY89px74JvrNYYIAhwznsRJKaMS2u9bhiWnJNWEkHbEDTBsmVLdHvYHdPwPUOezC5mB11nexjmbIiUDcVcluL6UHRpyDlBMGOKO5t-DcFm78gUR2bvqDCmOCrEzXHaZme7kGzvYv7HFJWUE_YHfotnfQ</addsrcrecordid><sourcetype>Aggregation Database</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>17762047</pqid></control><display><type>article</type><title>Speciation of combustion-derived particulate phase arsenic</title><source>Mary Ann Liebert Online Subscription</source><creator>HIRSCH, M. E ; STERLING, R. O ; HUGGINS, F. E ; HELBLE, J. J</creator><creatorcontrib>HIRSCH, M. E ; STERLING, R. O ; HUGGINS, F. E ; HELBLE, J. J</creatorcontrib><description>The speciation of inorganic arsenic compounds produced in pulverized coal combustion was investigated in a bench-scale study conducted under fuel-lean combustion conditions. Results suggest that at temperatures of 850-1100 K, and in the absence of particulate, arsenic initially condenses as As sub(2)O sub(3) rather than the thermodynamically favored As sub(2)O sub(5). Synthetic fly ash in the form of uniform 0.25 mu m spherical silica particles produced by sol-gel methods, added to the experimental system to simulate the presence of combustion-derived fly ash, did not affect arsenic speciation, nor did doping of the silica particles with small amounts of calcium. As(V) was only observed at these temperatures when calcium was added to the system as calcium acetate, producing a reactive calcium oxide fume and leading to the formation of calcium arsenate. From these results, it was concluded that the formation of arsenic(V) in combustion systems requires either the oxidation of As sub(2)O sub(3), which appears to be a kinetically limited process, or the presence of reactive calcium compounds. Additional experiments conducted with calcium silicate in an isothermal tube furnace suggested that calcium in silicates is capable of reacting with arsenic under long (order minutes) reaction time conditions. The apparent ability of calcium silicate particles to capture arsenic under idealized conditions suggests that calcium embedded in silicate fly ash may be capable of forming calcium arsenate, but the extent of this reaction on the time scales of a pulverized coal combustor or waste incinerator remains unclear.</description><identifier>ISSN: 1092-8758</identifier><identifier>EISSN: 1557-9018</identifier><identifier>DOI: 10.1089/ees.2000.17.315</identifier><language>eng</language><publisher>Larchmont, NY: Liebert</publisher><subject>Air pollution caused by fuel industries ; Applied sciences ; Atmospheric pollution ; Combustion and energy production ; Energy ; Energy. Thermal use of fuels ; Exact sciences and technology ; Metering. Control ; Pollution ; Pollution sources. Measurement results</subject><ispartof>Environmental engineering science, 2000-11, Vol.17 (6), p.315-327</ispartof><rights>2001 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c298t-12d2b68e33d9c4dcfd6a990eef5eccdd5f702347aad96307441b7152bff9107b3</citedby><cites>FETCH-LOGICAL-c298t-12d2b68e33d9c4dcfd6a990eef5eccdd5f702347aad96307441b7152bff9107b3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,3040,27923,27924</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=827241$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>HIRSCH, M. E</creatorcontrib><creatorcontrib>STERLING, R. O</creatorcontrib><creatorcontrib>HUGGINS, F. E</creatorcontrib><creatorcontrib>HELBLE, J. J</creatorcontrib><title>Speciation of combustion-derived particulate phase arsenic</title><title>Environmental engineering science</title><description>The speciation of inorganic arsenic compounds produced in pulverized coal combustion was investigated in a bench-scale study conducted under fuel-lean combustion conditions. Results suggest that at temperatures of 850-1100 K, and in the absence of particulate, arsenic initially condenses as As sub(2)O sub(3) rather than the thermodynamically favored As sub(2)O sub(5). Synthetic fly ash in the form of uniform 0.25 mu m spherical silica particles produced by sol-gel methods, added to the experimental system to simulate the presence of combustion-derived fly ash, did not affect arsenic speciation, nor did doping of the silica particles with small amounts of calcium. As(V) was only observed at these temperatures when calcium was added to the system as calcium acetate, producing a reactive calcium oxide fume and leading to the formation of calcium arsenate. From these results, it was concluded that the formation of arsenic(V) in combustion systems requires either the oxidation of As sub(2)O sub(3), which appears to be a kinetically limited process, or the presence of reactive calcium compounds. Additional experiments conducted with calcium silicate in an isothermal tube furnace suggested that calcium in silicates is capable of reacting with arsenic under long (order minutes) reaction time conditions. The apparent ability of calcium silicate particles to capture arsenic under idealized conditions suggests that calcium embedded in silicate fly ash may be capable of forming calcium arsenate, but the extent of this reaction on the time scales of a pulverized coal combustor or waste incinerator remains unclear.</description><subject>Air pollution caused by fuel industries</subject><subject>Applied sciences</subject><subject>Atmospheric pollution</subject><subject>Combustion and energy production</subject><subject>Energy</subject><subject>Energy. Thermal use of fuels</subject><subject>Exact sciences and technology</subject><subject>Metering. Control</subject><subject>Pollution</subject><subject>Pollution sources. Measurement results</subject><issn>1092-8758</issn><issn>1557-9018</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2000</creationdate><recordtype>article</recordtype><recordid>eNo9kEtLxDAUhYMoOI6u3RYEd53Js0ncyeALBlyo65AmNxjptDVpBf-9GWZwde-B853Fh9A1wSuClV4D5BXFuCS5YkScoAURQtYaE3VafqxpraRQ5-gi5y-MCeOMLNDd2wgu2ikOfTWEyg27ds77VHtI8Qd8Ndo0RTd3doJq_LQZKpsy9NFdorNguwxXx7tEH48P75vnevv69LK539aOajXVhHraNgoY89px74JvrNYYIAhwznsRJKaMS2u9bhiWnJNWEkHbEDTBsmVLdHvYHdPwPUOezC5mB11nexjmbIiUDcVcluL6UHRpyDlBMGOKO5t-DcFm78gUR2bvqDCmOCrEzXHaZme7kGzvYv7HFJWUE_YHfotnfQ</recordid><startdate>20001101</startdate><enddate>20001101</enddate><creator>HIRSCH, M. E</creator><creator>STERLING, R. O</creator><creator>HUGGINS, F. E</creator><creator>HELBLE, J. J</creator><general>Liebert</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7TV</scope><scope>C1K</scope></search><sort><creationdate>20001101</creationdate><title>Speciation of combustion-derived particulate phase arsenic</title><author>HIRSCH, M. E ; STERLING, R. O ; HUGGINS, F. E ; HELBLE, J. J</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c298t-12d2b68e33d9c4dcfd6a990eef5eccdd5f702347aad96307441b7152bff9107b3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2000</creationdate><topic>Air pollution caused by fuel industries</topic><topic>Applied sciences</topic><topic>Atmospheric pollution</topic><topic>Combustion and energy production</topic><topic>Energy</topic><topic>Energy. Thermal use of fuels</topic><topic>Exact sciences and technology</topic><topic>Metering. Control</topic><topic>Pollution</topic><topic>Pollution sources. Measurement results</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>HIRSCH, M. E</creatorcontrib><creatorcontrib>STERLING, R. O</creatorcontrib><creatorcontrib>HUGGINS, F. E</creatorcontrib><creatorcontrib>HELBLE, J. J</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Pollution Abstracts</collection><collection>Environmental Sciences and Pollution Management</collection><jtitle>Environmental engineering science</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>HIRSCH, M. E</au><au>STERLING, R. O</au><au>HUGGINS, F. E</au><au>HELBLE, J. J</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Speciation of combustion-derived particulate phase arsenic</atitle><jtitle>Environmental engineering science</jtitle><date>2000-11-01</date><risdate>2000</risdate><volume>17</volume><issue>6</issue><spage>315</spage><epage>327</epage><pages>315-327</pages><issn>1092-8758</issn><eissn>1557-9018</eissn><abstract>The speciation of inorganic arsenic compounds produced in pulverized coal combustion was investigated in a bench-scale study conducted under fuel-lean combustion conditions. Results suggest that at temperatures of 850-1100 K, and in the absence of particulate, arsenic initially condenses as As sub(2)O sub(3) rather than the thermodynamically favored As sub(2)O sub(5). Synthetic fly ash in the form of uniform 0.25 mu m spherical silica particles produced by sol-gel methods, added to the experimental system to simulate the presence of combustion-derived fly ash, did not affect arsenic speciation, nor did doping of the silica particles with small amounts of calcium. As(V) was only observed at these temperatures when calcium was added to the system as calcium acetate, producing a reactive calcium oxide fume and leading to the formation of calcium arsenate. From these results, it was concluded that the formation of arsenic(V) in combustion systems requires either the oxidation of As sub(2)O sub(3), which appears to be a kinetically limited process, or the presence of reactive calcium compounds. Additional experiments conducted with calcium silicate in an isothermal tube furnace suggested that calcium in silicates is capable of reacting with arsenic under long (order minutes) reaction time conditions. The apparent ability of calcium silicate particles to capture arsenic under idealized conditions suggests that calcium embedded in silicate fly ash may be capable of forming calcium arsenate, but the extent of this reaction on the time scales of a pulverized coal combustor or waste incinerator remains unclear.</abstract><cop>Larchmont, NY</cop><pub>Liebert</pub><doi>10.1089/ees.2000.17.315</doi><tpages>13</tpages></addata></record> |
fulltext | fulltext |
identifier | ISSN: 1092-8758 |
ispartof | Environmental engineering science, 2000-11, Vol.17 (6), p.315-327 |
issn | 1092-8758 1557-9018 |
language | eng |
recordid | cdi_proquest_miscellaneous_17762047 |
source | Mary Ann Liebert Online Subscription |
subjects | Air pollution caused by fuel industries Applied sciences Atmospheric pollution Combustion and energy production Energy Energy. Thermal use of fuels Exact sciences and technology Metering. Control Pollution Pollution sources. Measurement results |
title | Speciation of combustion-derived particulate phase arsenic |
url | https://sfx.bib-bvb.de/sfx_tum?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2025-01-12T14%3A15%3A17IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-proquest_cross&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.atitle=Speciation%20of%20combustion-derived%20particulate%20phase%20arsenic&rft.jtitle=Environmental%20engineering%20science&rft.au=HIRSCH,%20M.%20E&rft.date=2000-11-01&rft.volume=17&rft.issue=6&rft.spage=315&rft.epage=327&rft.pages=315-327&rft.issn=1092-8758&rft.eissn=1557-9018&rft_id=info:doi/10.1089/ees.2000.17.315&rft_dat=%3Cproquest_cross%3E17762047%3C/proquest_cross%3E%3Curl%3E%3C/url%3E&disable_directlink=true&sfx.directlink=off&sfx.report_link=0&rft_id=info:oai/&rft_pqid=17762047&rft_id=info:pmid/&rfr_iscdi=true |