Influences of the coating on silver nanoparticle toxicity in a chronic test with Daphnia magna

Y. Sakka, Aiga Mackevica, Lars Michael Skjolding, Anders Baun, J. Filser

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    Abstract

    Sources for differences in silver nanoparticle toxicity at standardized conditions can be numerous. They range from particle properties and their actual concentrations to
    differences in uptake or depuration by the test organisms. In the present study we compared the toxicity of two differently coated AgNP in a chronic Daphnia test. One type of AgNP was coated with citrate (cAgNP), the other AgNP were generally uncoated (pAgNP; p= pure), but sterically stabilized by an organic dispersant. Particles with a similar
    shape and diameter were chosen. The focus of the study was to relate observed differences in toxicity to characteristics of the AgNP, like size or surface potential, or to their corresponding behaviour during the test, like dissolution or uptake. The characteristics and the behaviour of the AgNP were investigated for changes in stability and especially the release of silver ions. In addition, uptake and depuration by the daphnids were compared. A chronic test was run with both AgNP at the same time. The results of the study are currently being analysed. The overall pattern of toxicity appears similar for both AgNP types, however, the less stable citrate AgNP (cAgNP) are more toxic than the more stable sterically stabilized AgNP (pAgNP). Whether this can be related to the concentrations in the test media, to the release of silver ions or to differences in uptake or depuration by the daphnids will be presented on the poster.
    Original languageEnglish
    Title of host publicationSETAC Europe 25th Annual Meeting : Abstract Book
    Number of pages1
    Place of PublicationBarcelona, Spain
    PublisherSETAC
    Publication date2015
    Publication statusPublished - 2015
    EventSETAC Europe 25th Annual Meeting - Barcelona, Spain
    Duration: 3 May 20157 May 2015
    Conference number: 25
    http://barcelona.setac.eu/?contentid=767

    Conference

    ConferenceSETAC Europe 25th Annual Meeting
    Number25
    Country/TerritorySpain
    CityBarcelona
    Period03/05/201507/05/2015
    Internet address

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