The effect of calcium on aqueous uranium(VI) speciation and adsorption to ferrihydrite and quartz
Recent studies of uranium(VI) geochemistry have focused on the potentially important role of the aqueous species, CaUO 2(CO 3) 3 2− and Ca 2UO 2(CO 3) 3 0(aq), on inhibition of microbial reduction and uranium(VI) aqueous speciation in contaminated groundwater. However, to our knowledge, there have b...
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| Veröffentlicht in: | Geochimica et cosmochimica acta 2006-03, Vol.70 (6), p.1379-1387 |
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| creator | Fox, Patricia M. Davis, James A. Zachara, John M. |
| description | Recent studies of uranium(VI) geochemistry have focused on the potentially important role of the aqueous species, CaUO
2(CO
3)
3
2− and Ca
2UO
2(CO
3)
3
0(aq), on inhibition of microbial reduction and uranium(VI) aqueous speciation in contaminated groundwater. However, to our knowledge, there have been no direct studies of the effects of these species on U(VI) adsorption by mineral phases. The sorption of U(VI) on quartz and ferrihydrite was investigated in NaNO
3 solutions equilibrated with either ambient air (430
ppm CO
2) or 2% CO
2 in the presence of 0, 1.8, or 8.9
mM Ca
2+. Under conditions where the Ca
2UO
2(CO
3)
3
0(aq) species predominates U(VI) aqueous speciation, the presence of Ca in solution lowered U(VI) adsorption on quartz from 77% in the absence of Ca to 42% and 10% at Ca concentrations of 1.8 and 8.9
mM, respectively. U(VI) adsorption to ferrihydrite decreased from 83% in the absence of Ca to 57% in the presence of 1.8
mM Ca. Surface complexation model predictions that included the formation constant for aqueous Ca
2UO
2(CO
3)
3
0(aq) accurately simulated the effect of Ca
2+ on U(VI) sorption onto quartz and ferrihydrite within the thermodynamic uncertainty of the stability constant value. This study confirms that Ca
2+ can have a significant impact on the aqueous speciation of U(VI), and consequently, on the sorption and mobility of U(VI) in aquifers. |
| doi_str_mv | 10.1016/j.gca.2005.11.027 |
| format | Article |
| fullrecord | <record><control><sourceid>proquest_osti_</sourceid><recordid>TN_cdi_osti_scitechconnect_881093</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><els_id>S0016703705009439</els_id><sourcerecordid>29059735</sourcerecordid><originalsourceid>FETCH-LOGICAL-a505t-f3ee7907c7d378c0f76aed97ae993943afd7a803e6e6885514a0fa4297a424903</originalsourceid><addsrcrecordid>eNqFkUFvFDEMhSMEEkvhB3ALFwSHGZxJsknECVVAK1XiUrhGVsZhs9qdbJMZpPLryXQ5t6fI8fcsPz_G3groBYjtp33_O2A_AOheiB4G84xthDVD57SUz9kGGtQZkOYle1XrHgCM1rBheLsjTjFSmHmOPOAhpOXI88TxbqG8VL4UnNrXh1_XH3k9UUg4p7U9jRzHmsvpoZwzj1RK2t2PJc300L5bsMx_X7MXEQ-V3vx_L9jPb19vL6-6mx_fry-_3HSoQc9dlETGgQlmlMYGiGaLNDqD5Jx0SmIcDVqQtKWttVoLhRBRDY1Qg3IgL9i789xc5-RraFuEXcjT1Kx5awU42Zj3Z-ZUcrNXZ39MNdDhgNPq1Q8OtDNSPw22eaCUfRIUzkqplGmgOIOh5FoLRX8q6Yjl3gvwa4R-71uEfo3QC-FbhE3z-ayhdrc_icpqi6ZAYyqrqzGnR9T_ANOxo1k</addsrcrecordid><sourcetype>Open Access Repository</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>19833447</pqid></control><display><type>article</type><title>The effect of calcium on aqueous uranium(VI) speciation and adsorption to ferrihydrite and quartz</title><source>Elsevier ScienceDirect Journals</source><creator>Fox, Patricia M. ; Davis, James A. ; Zachara, John M.</creator><creatorcontrib>Fox, Patricia M. ; Davis, James A. ; Zachara, John M. ; Pacific Northwest National Lab. (PNNL), Richland, WA (United States)</creatorcontrib><description>Recent studies of uranium(VI) geochemistry have focused on the potentially important role of the aqueous species, CaUO
2(CO
3)
3
2− and Ca
2UO
2(CO
3)
3
0(aq), on inhibition of microbial reduction and uranium(VI) aqueous speciation in contaminated groundwater. However, to our knowledge, there have been no direct studies of the effects of these species on U(VI) adsorption by mineral phases. The sorption of U(VI) on quartz and ferrihydrite was investigated in NaNO
3 solutions equilibrated with either ambient air (430
ppm CO
2) or 2% CO
2 in the presence of 0, 1.8, or 8.9
mM Ca
2+. Under conditions where the Ca
2UO
2(CO
3)
3
0(aq) species predominates U(VI) aqueous speciation, the presence of Ca in solution lowered U(VI) adsorption on quartz from 77% in the absence of Ca to 42% and 10% at Ca concentrations of 1.8 and 8.9
mM, respectively. U(VI) adsorption to ferrihydrite decreased from 83% in the absence of Ca to 57% in the presence of 1.8
mM Ca. Surface complexation model predictions that included the formation constant for aqueous Ca
2UO
2(CO
3)
3
0(aq) accurately simulated the effect of Ca
2+ on U(VI) sorption onto quartz and ferrihydrite within the thermodynamic uncertainty of the stability constant value. This study confirms that Ca
2+ can have a significant impact on the aqueous speciation of U(VI), and consequently, on the sorption and mobility of U(VI) in aquifers.</description><identifier>ISSN: 0016-7037</identifier><identifier>EISSN: 1872-9533</identifier><identifier>DOI: 10.1016/j.gca.2005.11.027</identifier><language>eng</language><publisher>United States: Elsevier Ltd</publisher><subject>ADSORPTION ; AIR ; AQUIFERS ; CALCIUM ; ENVIRONMENTAL SCIENCES ; GEOCHEMISTRY ; QUARTZ ; SORPTION ; STABILITY ; THERMODYNAMICS ; URANIUM</subject><ispartof>Geochimica et cosmochimica acta, 2006-03, Vol.70 (6), p.1379-1387</ispartof><rights>2006 Elsevier Inc.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a505t-f3ee7907c7d378c0f76aed97ae993943afd7a803e6e6885514a0fa4297a424903</citedby><cites>FETCH-LOGICAL-a505t-f3ee7907c7d378c0f76aed97ae993943afd7a803e6e6885514a0fa4297a424903</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.sciencedirect.com/science/article/pii/S0016703705009439$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>230,314,776,780,881,3537,27901,27902,65306</link.rule.ids><backlink>$$Uhttps://www.osti.gov/biblio/881093$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>Fox, Patricia M.</creatorcontrib><creatorcontrib>Davis, James A.</creatorcontrib><creatorcontrib>Zachara, John M.</creatorcontrib><creatorcontrib>Pacific Northwest National Lab. (PNNL), Richland, WA (United States)</creatorcontrib><title>The effect of calcium on aqueous uranium(VI) speciation and adsorption to ferrihydrite and quartz</title><title>Geochimica et cosmochimica acta</title><description>Recent studies of uranium(VI) geochemistry have focused on the potentially important role of the aqueous species, CaUO
2(CO
3)
3
2− and Ca
2UO
2(CO
3)
3
0(aq), on inhibition of microbial reduction and uranium(VI) aqueous speciation in contaminated groundwater. However, to our knowledge, there have been no direct studies of the effects of these species on U(VI) adsorption by mineral phases. The sorption of U(VI) on quartz and ferrihydrite was investigated in NaNO
3 solutions equilibrated with either ambient air (430
ppm CO
2) or 2% CO
2 in the presence of 0, 1.8, or 8.9
mM Ca
2+. Under conditions where the Ca
2UO
2(CO
3)
3
0(aq) species predominates U(VI) aqueous speciation, the presence of Ca in solution lowered U(VI) adsorption on quartz from 77% in the absence of Ca to 42% and 10% at Ca concentrations of 1.8 and 8.9
mM, respectively. U(VI) adsorption to ferrihydrite decreased from 83% in the absence of Ca to 57% in the presence of 1.8
mM Ca. Surface complexation model predictions that included the formation constant for aqueous Ca
2UO
2(CO
3)
3
0(aq) accurately simulated the effect of Ca
2+ on U(VI) sorption onto quartz and ferrihydrite within the thermodynamic uncertainty of the stability constant value. This study confirms that Ca
2+ can have a significant impact on the aqueous speciation of U(VI), and consequently, on the sorption and mobility of U(VI) in aquifers.</description><subject>ADSORPTION</subject><subject>AIR</subject><subject>AQUIFERS</subject><subject>CALCIUM</subject><subject>ENVIRONMENTAL SCIENCES</subject><subject>GEOCHEMISTRY</subject><subject>QUARTZ</subject><subject>SORPTION</subject><subject>STABILITY</subject><subject>THERMODYNAMICS</subject><subject>URANIUM</subject><issn>0016-7037</issn><issn>1872-9533</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2006</creationdate><recordtype>article</recordtype><recordid>eNqFkUFvFDEMhSMEEkvhB3ALFwSHGZxJsknECVVAK1XiUrhGVsZhs9qdbJMZpPLryXQ5t6fI8fcsPz_G3groBYjtp33_O2A_AOheiB4G84xthDVD57SUz9kGGtQZkOYle1XrHgCM1rBheLsjTjFSmHmOPOAhpOXI88TxbqG8VL4UnNrXh1_XH3k9UUg4p7U9jRzHmsvpoZwzj1RK2t2PJc300L5bsMx_X7MXEQ-V3vx_L9jPb19vL6-6mx_fry-_3HSoQc9dlETGgQlmlMYGiGaLNDqD5Jx0SmIcDVqQtKWttVoLhRBRDY1Qg3IgL9i789xc5-RraFuEXcjT1Kx5awU42Zj3Z-ZUcrNXZ39MNdDhgNPq1Q8OtDNSPw22eaCUfRIUzkqplGmgOIOh5FoLRX8q6Yjl3gvwa4R-71uEfo3QC-FbhE3z-ayhdrc_icpqi6ZAYyqrqzGnR9T_ANOxo1k</recordid><startdate>20060315</startdate><enddate>20060315</enddate><creator>Fox, Patricia M.</creator><creator>Davis, James A.</creator><creator>Zachara, John M.</creator><general>Elsevier Ltd</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7T7</scope><scope>8FD</scope><scope>C1K</scope><scope>FR3</scope><scope>P64</scope><scope>KR7</scope><scope>H8D</scope><scope>L7M</scope><scope>OTOTI</scope></search><sort><creationdate>20060315</creationdate><title>The effect of calcium on aqueous uranium(VI) speciation and adsorption to ferrihydrite and quartz</title><author>Fox, Patricia M. ; Davis, James A. ; Zachara, John M.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a505t-f3ee7907c7d378c0f76aed97ae993943afd7a803e6e6885514a0fa4297a424903</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2006</creationdate><topic>ADSORPTION</topic><topic>AIR</topic><topic>AQUIFERS</topic><topic>CALCIUM</topic><topic>ENVIRONMENTAL SCIENCES</topic><topic>GEOCHEMISTRY</topic><topic>QUARTZ</topic><topic>SORPTION</topic><topic>STABILITY</topic><topic>THERMODYNAMICS</topic><topic>URANIUM</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Fox, Patricia M.</creatorcontrib><creatorcontrib>Davis, James A.</creatorcontrib><creatorcontrib>Zachara, John M.</creatorcontrib><creatorcontrib>Pacific Northwest National Lab. (PNNL), Richland, WA (United States)</creatorcontrib><collection>CrossRef</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>Civil Engineering Abstracts</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>OSTI.GOV</collection><jtitle>Geochimica et cosmochimica acta</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Fox, Patricia M.</au><au>Davis, James A.</au><au>Zachara, John M.</au><aucorp>Pacific Northwest National Lab. (PNNL), Richland, WA (United States)</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The effect of calcium on aqueous uranium(VI) speciation and adsorption to ferrihydrite and quartz</atitle><jtitle>Geochimica et cosmochimica acta</jtitle><date>2006-03-15</date><risdate>2006</risdate><volume>70</volume><issue>6</issue><spage>1379</spage><epage>1387</epage><pages>1379-1387</pages><issn>0016-7037</issn><eissn>1872-9533</eissn><abstract>Recent studies of uranium(VI) geochemistry have focused on the potentially important role of the aqueous species, CaUO
2(CO
3)
3
2− and Ca
2UO
2(CO
3)
3
0(aq), on inhibition of microbial reduction and uranium(VI) aqueous speciation in contaminated groundwater. However, to our knowledge, there have been no direct studies of the effects of these species on U(VI) adsorption by mineral phases. The sorption of U(VI) on quartz and ferrihydrite was investigated in NaNO
3 solutions equilibrated with either ambient air (430
ppm CO
2) or 2% CO
2 in the presence of 0, 1.8, or 8.9
mM Ca
2+. Under conditions where the Ca
2UO
2(CO
3)
3
0(aq) species predominates U(VI) aqueous speciation, the presence of Ca in solution lowered U(VI) adsorption on quartz from 77% in the absence of Ca to 42% and 10% at Ca concentrations of 1.8 and 8.9
mM, respectively. U(VI) adsorption to ferrihydrite decreased from 83% in the absence of Ca to 57% in the presence of 1.8
mM Ca. Surface complexation model predictions that included the formation constant for aqueous Ca
2UO
2(CO
3)
3
0(aq) accurately simulated the effect of Ca
2+ on U(VI) sorption onto quartz and ferrihydrite within the thermodynamic uncertainty of the stability constant value. This study confirms that Ca
2+ can have a significant impact on the aqueous speciation of U(VI), and consequently, on the sorption and mobility of U(VI) in aquifers.</abstract><cop>United States</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.gca.2005.11.027</doi><tpages>9</tpages><oa>free_for_read</oa></addata></record> |
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| identifier | ISSN: 0016-7037 |
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| issn | 0016-7037 1872-9533 |
| language | eng |
| recordid | cdi_osti_scitechconnect_881093 |
| source | Elsevier ScienceDirect Journals |
| subjects | ADSORPTION AIR AQUIFERS CALCIUM ENVIRONMENTAL SCIENCES GEOCHEMISTRY QUARTZ SORPTION STABILITY THERMODYNAMICS URANIUM |
| title | The effect of calcium on aqueous uranium(VI) speciation and adsorption to ferrihydrite and quartz |
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