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dc.contributor.authorGlomstad, Berit
dc.contributor.authorAltin, Dag
dc.contributor.authorSørensen, Lisbet
dc.contributor.authorLiu, Jingfu
dc.contributor.authorJenssen, Bjørn Munro
dc.contributor.authorBooth, Andy
dc.date.accessioned2017-10-09T08:37:35Z
dc.date.available2017-10-09T08:37:35Z
dc.date.created2016-02-11T13:28:38Z
dc.date.issued2016
dc.identifier.citationEnvironmental Science and Technology. 2016, 50 (5), 2660-2668.nb_NO
dc.identifier.issn0013-936X
dc.identifier.urihttp://hdl.handle.net/11250/2459105
dc.description.abstractThe bioavailability of organic contaminants adsorbed to carbon nanotubes (CNTs) remains unclear, especially in complex natural freshwaters containing natural organic matter (NOM). Here, we report on the adsorption capacity (Q0) of five CNTs exhibiting different physicochemical properties, including a single-walled CNT (SWCNTs), multiwalled CNTs (MWCNT-15 and MWCNT-30), and functionalized MWCNTs (hydroxyl, −OH, and carboxyl, −COOH), for the model polycyclic aromatic hydrocarbon phenanthrene (3.1−800 μg/L). The influence of phenanthrene adsorption by the CNTs on bioavailability and toxicity was investigated using the freshwater algae Pseudokirchneriella subcapitata. CNTs were dispersed in algal growth media containing NOM (DOC, 8.77 mg/L; dispersed concentrations: 0.5, 1.3, 1.3, 3.3, and 6.1 mg/L for SWCNT, MWCNT-15, MWCNT-30, MWCNT−OH, and MWCNT−COOH, respectively). Adsorption isotherms of phenanthrene to the dispersed CNTs were fitted with the Dubinin−Ashtakhov model. Q0 differed among the CNTs, increasing with increasing surface area and decreasing with surface functionalization. SWCNT and MWCNT−COOH exhibited the highest and lowest log Q0 (8.891 and 7.636 μg/kg, respectively). The presence of SWCNTs reduced phenanthrene toxicity to algae (EC50; 528.4) compared to phenanthrene-only (EC50; 438.3), and the presence of MWCNTs had no significant effect on phenanthrene toxicity. However, phenanthrene adsorbed to NOM-dispersed CNTs proved to be bioavailable and contribute to exert toxicity to P. subcapitata.nb_NO
dc.language.isoengnb_NO
dc.publisherRoyal Society of Chemistrynb_NO
dc.titleCarbon Nanotube Properties Influence Adsorption of Phenanthrene and Subsequent Bioavailability and Toxicity to Pseudokirchneriella subcapitatanb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionacceptedVersionnb_NO
dc.source.pagenumber2660-2668nb_NO
dc.source.volume50nb_NO
dc.source.journalEnvironmental Science and Technologynb_NO
dc.source.issue5nb_NO
dc.identifier.doi10.1021/acs.est.5b05177
dc.identifier.cristin1334925
dc.relation.projectNorges forskningsråd: 209685nb_NO
dc.relation.projectAndre: GJHZ1206nb_NO
dc.description.localcodeThis journal is © The Royal Society of Chemistry 2016. This is the authors accepted and refereed manuscript to the article.nb_NO
cristin.unitcode194,66,10,0
cristin.unitnameInstitutt for biologi
cristin.ispublishedtrue
cristin.fulltextpostprint
cristin.qualitycode2


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