title: Zinc bioaccumulation in a terrestrial invertebrate fed a diet treated with particulate ZnO or ZnCl2 solution.
abstract: A number of reports on potential toxicity of nanoparticles are available, but there is still a lack of knowledge concerning bioaccumulation. The aim of this work was to investigate how different sources of zinc, such as uncoated and unmodified ZnO nanoparticles, ZnCl(2) in solution, and macropowder ZnO influence the bioaccumulation of this metal in the terrestrial isopod Porcellio scaber. After exposure to different sources of Zn in the diet, the amount of assimilated Zn in whole body, the efficiency of zinc assimilation, and bioaccumulation factors (BAFs) were assessed. The bioaccumulation potential of Zn was found to be the same regardless of Zn source. The amount of assimilated Zn and BAF were dose-dependent, and Zn assimilation efficiency was independent of exposure concentrations. The Zn assimilation capacity was found to be up to 16% of ingested Zn. It is known that as much as approximately 20% of Zn can be accreted from ZnO particles by dissolution. We conclude that bioaccumulation of Zn in isopods exposed to particulate ZnO depends most probably on Zn dissolution from ZnO particles and not on bioaccumulation of particulate ZnO.
authors.affiliation: University of Ljubljana, Biotechnical Faculty, Department of Biology, Vecna pot 111, SI-1000 Ljubljana, Slovenia. ziva.pipan@bf.uni-lj.si <ziva.pipan@bf.uni-lj.si>
authors.forename: Ziva
authors.initials: Z
authors.lastname: Pipan-Tkalec
authors.forename: Damjana
authors.initials: D
authors.lastname: Drobne
authors.forename: Anita
authors.initials: A
authors.lastname: Jemec
authors.forename: Tea
authors.initials: T
authors.lastname: Romih
authors.forename: Primoz
authors.initials: P
authors.lastname: Zidar
authors.forename: Marjan
authors.initials: M
authors.lastname: Bele
mesh_terms: D000818:Animals; D002712:Chlorides / Q000378:metabolism* / Q000633:toxicity; D004305:Dose-Response Relationship, Drug; D005247:Feeding Behavior / Q000187:drug effects; D033321:Isopoda / Q000187:drug effects / Q000378:metabolism*; D052638:Particulate Matter / Q000378:metabolism* / Q000633:toxicity; D015032:Zinc / Q000378:metabolism* / Q000633:toxicity; D017967:Zinc Compounds / Q000378:metabolism* / Q000633:toxicity; D015034:Zinc Oxide / Q000378:metabolism* / Q000633:toxicity
chemical_list: D002712:Chlorides; D052638:Particulate Matter; D017967:Zinc Compounds; C016837:zinc chloride; D015032:Zinc; D015034:Zinc Oxide