Ionic strength effects on sulfate and phosphate adsorption on gamma-alumina and kaolinite: triple-layer model
It is known that PO4 is retained by soils through ligand exchange, i.e., inner sphere complexation, but the mechanism for SO4 adsorption at the mineral-water interface has been in debate. By studying the effects of ionic strength on ion adsorption, it is possible to distinguish between inner and out...
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| Veröffentlicht in: | Soil Science Society of America journal 1997-05, Vol.61 (3), p.784-793 |
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| container_title | Soil Science Society of America journal |
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| creator | He, L.M. (Univ. of California at San Diego, La Jolla, CA.) Zelazny, L.W Baligar, V.C Ritchey, K.D Martens, D.C |
| description | It is known that PO4 is retained by soils through ligand exchange, i.e., inner sphere complexation, but the mechanism for SO4 adsorption at the mineral-water interface has been in debate. By studying the effects of ionic strength on ion adsorption, it is possible to distinguish between inner and outer sphere ion surface complexes. This study was conducted to evaluate ionic strength effects on SO4 and PO4 adsorption on gamma-Al2O3 and kaolinite at varying solution pH (3-11), and to infer SO4 and PO4 adsorption mechanisms at the mineral-water interface. The adsorption of SO4 on gamma-Al2O3 and kaolinite decreased monotonically with increasing solution pH and was markedly reduced by increasing the concentration of background electrolyte. On the other hand, PO4 adsorption on gamma-Al2O3 and kaolinite increased from pH 3 to 4 and decreased from pH 6 to 11, with an adsorption plateau between pH 4 and 6. Effects of change in ionic strength on PO4 adsorption varied with pH. At low pH, PO4 adsorption demonstrated a slight decrease with increasing ionic strength, whereas at high pH, PO4 adsorption increased slightly with increasing ionic strength, resulting in a crossover point where there was no ionic strength effect. The triple-layer model (TLM) was applied to model the adsorption of SO4 and PO4 with both inner and outer sphere complexes using the FITEQL 3.1 computer program. Sulfate adsorption was better modeled by assuming outer sphere complex formation, while PO4 adsorption was better modeled by assuming inner sphere complex formation |
| doi_str_mv | 10.2136/sssaj1997.03615995006100030011x |
| format | Article |
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(Univ. of California at San Diego, La Jolla, CA.) ; Zelazny, L.W ; Baligar, V.C ; Ritchey, K.D ; Martens, D.C</creator><creatorcontrib>He, L.M. (Univ. of California at San Diego, La Jolla, CA.) ; Zelazny, L.W ; Baligar, V.C ; Ritchey, K.D ; Martens, D.C</creatorcontrib><description>It is known that PO4 is retained by soils through ligand exchange, i.e., inner sphere complexation, but the mechanism for SO4 adsorption at the mineral-water interface has been in debate. By studying the effects of ionic strength on ion adsorption, it is possible to distinguish between inner and outer sphere ion surface complexes. This study was conducted to evaluate ionic strength effects on SO4 and PO4 adsorption on gamma-Al2O3 and kaolinite at varying solution pH (3-11), and to infer SO4 and PO4 adsorption mechanisms at the mineral-water interface. The adsorption of SO4 on gamma-Al2O3 and kaolinite decreased monotonically with increasing solution pH and was markedly reduced by increasing the concentration of background electrolyte. On the other hand, PO4 adsorption on gamma-Al2O3 and kaolinite increased from pH 3 to 4 and decreased from pH 6 to 11, with an adsorption plateau between pH 4 and 6. Effects of change in ionic strength on PO4 adsorption varied with pH. At low pH, PO4 adsorption demonstrated a slight decrease with increasing ionic strength, whereas at high pH, PO4 adsorption increased slightly with increasing ionic strength, resulting in a crossover point where there was no ionic strength effect. The triple-layer model (TLM) was applied to model the adsorption of SO4 and PO4 with both inner and outer sphere complexes using the FITEQL 3.1 computer program. Sulfate adsorption was better modeled by assuming outer sphere complex formation, while PO4 adsorption was better modeled by assuming inner sphere complex formation</description><identifier>ISSN: 0361-5995</identifier><identifier>EISSN: 1435-0661</identifier><identifier>DOI: 10.2136/sssaj1997.03615995006100030011x</identifier><identifier>CODEN: SSSJD4</identifier><language>eng</language><publisher>Madison, WI: Soil Science Society of America</publisher><subject>ADSORCION ; ADSORPTION ; Agronomy. Soil science and plant productions ; ALUMINIO ; ALUMINIUM ; ANION ; ANIONES ; Biological and medical sciences ; CAOLINITA ; Chemical, physicochemical, biochemical and biological properties ; Chemistry ; CHIMIE DU SOL ; COLLOIDE ; COLOIDES ; Earth sciences ; Earth, ocean, space ; Exact sciences and technology ; FOSFATOS ; Fundamental and applied biological sciences. Psychology ; Geochemistry ; INTERFACE ; ION ; IONES ; Ions ; KAOLINITE ; Mineral components. Ionic and exchange properties ; Minerals ; MODELE DE SIMULATION ; MODELE MATHEMATIQUE ; MODELOS DE SIMULACION ; MODELOS MATEMATICOS ; OXIDOS ; OXYDE ; PH DEL SUELO ; PH DU SOL ; PHENOMENE D'INTERFACE ; PHOSPHATE ; Phosphates ; Physics, chemistry, biochemistry and biology of agricultural and forest soils ; QUIMICA DEL SUELO ; Soil and rock geochemistry ; Soil science ; Soils ; SULFATE ; SULFATOS ; Surficial geology</subject><ispartof>Soil Science Society of America journal, 1997-05, Vol.61 (3), p.784-793</ispartof><rights>1997 Soil Science Society of America</rights><rights>1997 INIST-CNRS</rights><rights>Copyright American Society of Agronomy May 1997</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c497X-f065847d9eed93356d84332267f0d6139e48f13d65cbfde310042f30fa07b6613</citedby></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.2136%2Fsssaj1997.03615995006100030011x$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.2136%2Fsssaj1997.03615995006100030011x$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,780,784,1417,27924,27925,45574,45575</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=2786260$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>He, L.M. (Univ. of California at San Diego, La Jolla, CA.)</creatorcontrib><creatorcontrib>Zelazny, L.W</creatorcontrib><creatorcontrib>Baligar, V.C</creatorcontrib><creatorcontrib>Ritchey, K.D</creatorcontrib><creatorcontrib>Martens, D.C</creatorcontrib><title>Ionic strength effects on sulfate and phosphate adsorption on gamma-alumina and kaolinite: triple-layer model</title><title>Soil Science Society of America journal</title><description>It is known that PO4 is retained by soils through ligand exchange, i.e., inner sphere complexation, but the mechanism for SO4 adsorption at the mineral-water interface has been in debate. By studying the effects of ionic strength on ion adsorption, it is possible to distinguish between inner and outer sphere ion surface complexes. This study was conducted to evaluate ionic strength effects on SO4 and PO4 adsorption on gamma-Al2O3 and kaolinite at varying solution pH (3-11), and to infer SO4 and PO4 adsorption mechanisms at the mineral-water interface. The adsorption of SO4 on gamma-Al2O3 and kaolinite decreased monotonically with increasing solution pH and was markedly reduced by increasing the concentration of background electrolyte. On the other hand, PO4 adsorption on gamma-Al2O3 and kaolinite increased from pH 3 to 4 and decreased from pH 6 to 11, with an adsorption plateau between pH 4 and 6. Effects of change in ionic strength on PO4 adsorption varied with pH. At low pH, PO4 adsorption demonstrated a slight decrease with increasing ionic strength, whereas at high pH, PO4 adsorption increased slightly with increasing ionic strength, resulting in a crossover point where there was no ionic strength effect. The triple-layer model (TLM) was applied to model the adsorption of SO4 and PO4 with both inner and outer sphere complexes using the FITEQL 3.1 computer program. Sulfate adsorption was better modeled by assuming outer sphere complex formation, while PO4 adsorption was better modeled by assuming inner sphere complex formation</description><subject>ADSORCION</subject><subject>ADSORPTION</subject><subject>Agronomy. Soil science and plant productions</subject><subject>ALUMINIO</subject><subject>ALUMINIUM</subject><subject>ANION</subject><subject>ANIONES</subject><subject>Biological and medical sciences</subject><subject>CAOLINITA</subject><subject>Chemical, physicochemical, biochemical and biological properties</subject><subject>Chemistry</subject><subject>CHIMIE DU SOL</subject><subject>COLLOIDE</subject><subject>COLOIDES</subject><subject>Earth sciences</subject><subject>Earth, ocean, space</subject><subject>Exact sciences and technology</subject><subject>FOSFATOS</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>Geochemistry</subject><subject>INTERFACE</subject><subject>ION</subject><subject>IONES</subject><subject>Ions</subject><subject>KAOLINITE</subject><subject>Mineral components. Ionic and exchange properties</subject><subject>Minerals</subject><subject>MODELE DE SIMULATION</subject><subject>MODELE MATHEMATIQUE</subject><subject>MODELOS DE SIMULACION</subject><subject>MODELOS MATEMATICOS</subject><subject>OXIDOS</subject><subject>OXYDE</subject><subject>PH DEL SUELO</subject><subject>PH DU SOL</subject><subject>PHENOMENE D'INTERFACE</subject><subject>PHOSPHATE</subject><subject>Phosphates</subject><subject>Physics, chemistry, biochemistry and biology of agricultural and forest soils</subject><subject>QUIMICA DEL SUELO</subject><subject>Soil and rock geochemistry</subject><subject>Soil science</subject><subject>Soils</subject><subject>SULFATE</subject><subject>SULFATOS</subject><subject>Surficial geology</subject><issn>0361-5995</issn><issn>1435-0661</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1997</creationdate><recordtype>article</recordtype><recordid>eNqV0V2L1DAUBuAgCo6rf8CrIuJedT35bryRZfFjZcGLcWHvSrZNZjKmSU1a1vn3pjPLXsgiCKUl8PC-OT0InWI4I5iK9zlnvcNKyTOgAnOlOIDAAEABMP79BK0wo7wGIfBTtFpMvaDn6EXOu0K4Alih4TIG11V5SiZspm1lrDXdlKsYqjx7qydT6dBX4zbmcXs49TmmcXIFlGejh0HX2s-DC_ogf-roXXCT-VBNyY3e1F7vTaqG2Bv_Ej2z2mfz6v57gq4_f_px8bW--v7l8uL8qu6Ykje1BcEbJntlTK8o5aJvGKWECGmhF5gqwxqLaS94d2t7Q8vUjFgKVoO8LfPSE3R6zB1T_DWbPLWDy53xXgcT59xKRgVwwnmR7_4py69WSh0i3_wFd3FOoUxRjACmMIGCPh5Rl2LOydh2TG7Qad9iWKJE-7C19tGtlYS39zU6d9rbpEPn8kMMkY0gYilqj-zOebP_35Z2ff6NrNflvZjHyE1peH1ssDq2epPKJa7XSjKpGkz_AIqEu9o</recordid><startdate>199705</startdate><enddate>199705</enddate><creator>He, L.M. (Univ. of California at San Diego, La Jolla, CA.)</creator><creator>Zelazny, L.W</creator><creator>Baligar, V.C</creator><creator>Ritchey, K.D</creator><creator>Martens, D.C</creator><general>Soil Science Society of America</general><general>American Society of Agronomy</general><scope>FBQ</scope><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7ST</scope><scope>7T7</scope><scope>8FD</scope><scope>C1K</scope><scope>FR3</scope><scope>P64</scope><scope>SOI</scope><scope>KR7</scope></search><sort><creationdate>199705</creationdate><title>Ionic strength effects on sulfate and phosphate adsorption on gamma-alumina and kaolinite: triple-layer model</title><author>He, L.M. (Univ. of California at San Diego, La Jolla, CA.) ; Zelazny, L.W ; Baligar, V.C ; Ritchey, K.D ; Martens, D.C</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c497X-f065847d9eed93356d84332267f0d6139e48f13d65cbfde310042f30fa07b6613</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1997</creationdate><topic>ADSORCION</topic><topic>ADSORPTION</topic><topic>Agronomy. Soil science and plant productions</topic><topic>ALUMINIO</topic><topic>ALUMINIUM</topic><topic>ANION</topic><topic>ANIONES</topic><topic>Biological and medical sciences</topic><topic>CAOLINITA</topic><topic>Chemical, physicochemical, biochemical and biological properties</topic><topic>Chemistry</topic><topic>CHIMIE DU SOL</topic><topic>COLLOIDE</topic><topic>COLOIDES</topic><topic>Earth sciences</topic><topic>Earth, ocean, space</topic><topic>Exact sciences and technology</topic><topic>FOSFATOS</topic><topic>Fundamental and applied biological sciences. Psychology</topic><topic>Geochemistry</topic><topic>INTERFACE</topic><topic>ION</topic><topic>IONES</topic><topic>Ions</topic><topic>KAOLINITE</topic><topic>Mineral components. Ionic and exchange properties</topic><topic>Minerals</topic><topic>MODELE DE SIMULATION</topic><topic>MODELE MATHEMATIQUE</topic><topic>MODELOS DE SIMULACION</topic><topic>MODELOS MATEMATICOS</topic><topic>OXIDOS</topic><topic>OXYDE</topic><topic>PH DEL SUELO</topic><topic>PH DU SOL</topic><topic>PHENOMENE D'INTERFACE</topic><topic>PHOSPHATE</topic><topic>Phosphates</topic><topic>Physics, chemistry, biochemistry and biology of agricultural and forest soils</topic><topic>QUIMICA DEL SUELO</topic><topic>Soil and rock geochemistry</topic><topic>Soil science</topic><topic>Soils</topic><topic>SULFATE</topic><topic>SULFATOS</topic><topic>Surficial geology</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>He, L.M. (Univ. of California at San Diego, La Jolla, CA.)</creatorcontrib><creatorcontrib>Zelazny, L.W</creatorcontrib><creatorcontrib>Baligar, V.C</creatorcontrib><creatorcontrib>Ritchey, K.D</creatorcontrib><creatorcontrib>Martens, D.C</creatorcontrib><collection>AGRIS</collection><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Environment Abstracts</collection><collection>Industrial and Applied Microbiology Abstracts (Microbiology A)</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>Engineering Research Database</collection><collection>Biotechnology and BioEngineering Abstracts</collection><collection>Environment Abstracts</collection><collection>Civil Engineering Abstracts</collection><jtitle>Soil Science Society of America journal</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>He, L.M. (Univ. of California at San Diego, La Jolla, CA.)</au><au>Zelazny, L.W</au><au>Baligar, V.C</au><au>Ritchey, K.D</au><au>Martens, D.C</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Ionic strength effects on sulfate and phosphate adsorption on gamma-alumina and kaolinite: triple-layer model</atitle><jtitle>Soil Science Society of America journal</jtitle><date>1997-05</date><risdate>1997</risdate><volume>61</volume><issue>3</issue><spage>784</spage><epage>793</epage><pages>784-793</pages><issn>0361-5995</issn><eissn>1435-0661</eissn><coden>SSSJD4</coden><abstract>It is known that PO4 is retained by soils through ligand exchange, i.e., inner sphere complexation, but the mechanism for SO4 adsorption at the mineral-water interface has been in debate. By studying the effects of ionic strength on ion adsorption, it is possible to distinguish between inner and outer sphere ion surface complexes. This study was conducted to evaluate ionic strength effects on SO4 and PO4 adsorption on gamma-Al2O3 and kaolinite at varying solution pH (3-11), and to infer SO4 and PO4 adsorption mechanisms at the mineral-water interface. The adsorption of SO4 on gamma-Al2O3 and kaolinite decreased monotonically with increasing solution pH and was markedly reduced by increasing the concentration of background electrolyte. On the other hand, PO4 adsorption on gamma-Al2O3 and kaolinite increased from pH 3 to 4 and decreased from pH 6 to 11, with an adsorption plateau between pH 4 and 6. Effects of change in ionic strength on PO4 adsorption varied with pH. At low pH, PO4 adsorption demonstrated a slight decrease with increasing ionic strength, whereas at high pH, PO4 adsorption increased slightly with increasing ionic strength, resulting in a crossover point where there was no ionic strength effect. The triple-layer model (TLM) was applied to model the adsorption of SO4 and PO4 with both inner and outer sphere complexes using the FITEQL 3.1 computer program. Sulfate adsorption was better modeled by assuming outer sphere complex formation, while PO4 adsorption was better modeled by assuming inner sphere complex formation</abstract><cop>Madison, WI</cop><pub>Soil Science Society of America</pub><doi>10.2136/sssaj1997.03615995006100030011x</doi><tpages>10</tpages></addata></record> |
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| subjects | ADSORCION ADSORPTION Agronomy. Soil science and plant productions ALUMINIO ALUMINIUM ANION ANIONES Biological and medical sciences CAOLINITA Chemical, physicochemical, biochemical and biological properties Chemistry CHIMIE DU SOL COLLOIDE COLOIDES Earth sciences Earth, ocean, space Exact sciences and technology FOSFATOS Fundamental and applied biological sciences. Psychology Geochemistry INTERFACE ION IONES Ions KAOLINITE Mineral components. Ionic and exchange properties Minerals MODELE DE SIMULATION MODELE MATHEMATIQUE MODELOS DE SIMULACION MODELOS MATEMATICOS OXIDOS OXYDE PH DEL SUELO PH DU SOL PHENOMENE D'INTERFACE PHOSPHATE Phosphates Physics, chemistry, biochemistry and biology of agricultural and forest soils QUIMICA DEL SUELO Soil and rock geochemistry Soil science Soils SULFATE SULFATOS Surficial geology |
| title | Ionic strength effects on sulfate and phosphate adsorption on gamma-alumina and kaolinite: triple-layer model |
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