The ionic strength effect on microcystin and natural organic matter surrogate adsorption onto PAC
Autor(a) principal: | |
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Data de Publicação: | 2006 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://repositorio.lnec.pt:8080/jspui/handle/123456789/1007474 |
Resumo: | This work aims to contribute to a better understanding of the ionic strength effect on microcystin and natural organic matter (NOM) surrogate adsorption by analyzing the importance of adsorbate molecular size, and surface concentration. Adsorption kinetics and/or isotherms were performed on PAC Norit SA-UF for four microcystin variants (MC-LR,MC-LY,MC-LW,MCLF), and three NOM surrogates (salicylicacid(SA), tannicacid(TA), Aldrichhumicacid(AHA)) at different solution ionic strengths. Results showed that the ionic strength effect depends upon the adsorbate surface concentration, cation charge (monoordivalent), and adsorbate molecular size. Potassium seemed not to affect the MC-LR adsorption, while calcium enhanced MC-LR kinetics and adsorption capacity. K+ and, particularly, Ca2+ improved the adsorption kinetics of the other microcystin variants. For identical surface concentration and ionic strength, the impact of K+ and Ca2+ on NOM surrogates depended on the adsorbate molecular size: K+ effect was only observed for AHA, whereas Ca2+ caused no effect on SA adsorption, slightly enhanced TA adsorption, and greatly enhanced AHA adsorption. MC-LR isotherms with two salt concentrations (KCl or CaCl2) indicated that, for the studied range of equilibrium surface concentration (5.3–18.7mg/g), an enhanced adsorption regime prevails, and no transition regime was observed. |
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The ionic strength effect on microcystin and natural organic matter surrogate adsorption onto PACMicrocystinsPACAdsorptionNOM surrogatesSurface concentrationIonic strengthThis work aims to contribute to a better understanding of the ionic strength effect on microcystin and natural organic matter (NOM) surrogate adsorption by analyzing the importance of adsorbate molecular size, and surface concentration. Adsorption kinetics and/or isotherms were performed on PAC Norit SA-UF for four microcystin variants (MC-LR,MC-LY,MC-LW,MCLF), and three NOM surrogates (salicylicacid(SA), tannicacid(TA), Aldrichhumicacid(AHA)) at different solution ionic strengths. Results showed that the ionic strength effect depends upon the adsorbate surface concentration, cation charge (monoordivalent), and adsorbate molecular size. Potassium seemed not to affect the MC-LR adsorption, while calcium enhanced MC-LR kinetics and adsorption capacity. K+ and, particularly, Ca2+ improved the adsorption kinetics of the other microcystin variants. For identical surface concentration and ionic strength, the impact of K+ and Ca2+ on NOM surrogates depended on the adsorbate molecular size: K+ effect was only observed for AHA, whereas Ca2+ caused no effect on SA adsorption, slightly enhanced TA adsorption, and greatly enhanced AHA adsorption. MC-LR isotherms with two salt concentrations (KCl or CaCl2) indicated that, for the studied range of equilibrium surface concentration (5.3–18.7mg/g), an enhanced adsorption regime prevails, and no transition regime was observed.Elsevier2015-08-12T10:51:13Z2017-04-12T13:46:20Z2006-01-01T00:00:00Z2006info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://repositorio.lnec.pt:8080/jspui/handle/123456789/1007474engCampinas, M.Rosa, M. J.info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-01-13T03:02:10Zoai:localhost:123456789/1007474Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T01:38:24.818733Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
The ionic strength effect on microcystin and natural organic matter surrogate adsorption onto PAC |
title |
The ionic strength effect on microcystin and natural organic matter surrogate adsorption onto PAC |
spellingShingle |
The ionic strength effect on microcystin and natural organic matter surrogate adsorption onto PAC Campinas, M. Microcystins PAC Adsorption NOM surrogates Surface concentration Ionic strength |
title_short |
The ionic strength effect on microcystin and natural organic matter surrogate adsorption onto PAC |
title_full |
The ionic strength effect on microcystin and natural organic matter surrogate adsorption onto PAC |
title_fullStr |
The ionic strength effect on microcystin and natural organic matter surrogate adsorption onto PAC |
title_full_unstemmed |
The ionic strength effect on microcystin and natural organic matter surrogate adsorption onto PAC |
title_sort |
The ionic strength effect on microcystin and natural organic matter surrogate adsorption onto PAC |
author |
Campinas, M. |
author_facet |
Campinas, M. Rosa, M. J. |
author_role |
author |
author2 |
Rosa, M. J. |
author2_role |
author |
dc.contributor.author.fl_str_mv |
Campinas, M. Rosa, M. J. |
dc.subject.por.fl_str_mv |
Microcystins PAC Adsorption NOM surrogates Surface concentration Ionic strength |
topic |
Microcystins PAC Adsorption NOM surrogates Surface concentration Ionic strength |
description |
This work aims to contribute to a better understanding of the ionic strength effect on microcystin and natural organic matter (NOM) surrogate adsorption by analyzing the importance of adsorbate molecular size, and surface concentration. Adsorption kinetics and/or isotherms were performed on PAC Norit SA-UF for four microcystin variants (MC-LR,MC-LY,MC-LW,MCLF), and three NOM surrogates (salicylicacid(SA), tannicacid(TA), Aldrichhumicacid(AHA)) at different solution ionic strengths. Results showed that the ionic strength effect depends upon the adsorbate surface concentration, cation charge (monoordivalent), and adsorbate molecular size. Potassium seemed not to affect the MC-LR adsorption, while calcium enhanced MC-LR kinetics and adsorption capacity. K+ and, particularly, Ca2+ improved the adsorption kinetics of the other microcystin variants. For identical surface concentration and ionic strength, the impact of K+ and Ca2+ on NOM surrogates depended on the adsorbate molecular size: K+ effect was only observed for AHA, whereas Ca2+ caused no effect on SA adsorption, slightly enhanced TA adsorption, and greatly enhanced AHA adsorption. MC-LR isotherms with two salt concentrations (KCl or CaCl2) indicated that, for the studied range of equilibrium surface concentration (5.3–18.7mg/g), an enhanced adsorption regime prevails, and no transition regime was observed. |
publishDate |
2006 |
dc.date.none.fl_str_mv |
2006-01-01T00:00:00Z 2006 2015-08-12T10:51:13Z 2017-04-12T13:46:20Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://repositorio.lnec.pt:8080/jspui/handle/123456789/1007474 |
url |
http://repositorio.lnec.pt:8080/jspui/handle/123456789/1007474 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Elsevier |
publisher.none.fl_str_mv |
Elsevier |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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