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The release of highly toxic Ag+ through dissolution of AgNPs is one mechanism leading to toxic effects in sediments. We applied an ultrasound-assisted sequential extraction method to evaluate the dissolution of AgNPs and to study the partitioning of dissolved Ag in sediments. Silver was spiked into artificial and 2 natural sediments (Lake H\u00f6yti\u00e4inen sediment and Lake Kuorinka sediment) as silver nitrate (AgNO3), uncoated AgNPs, or polyvinylpyrrolidone-coated AgNPs (PVP-AgNPs). In addition, the total body burdens of Ag in the sediment-dwelling oligochaete Lumbriculus variegatus were assessed over a 28-d exposure period. The dissolution rate was found to be similar between the uncoated AgNP and PVP-AgNP groups. In all sediments, dissolved Ag was mainly bound to the residual fraction of the sediment, followed by iron and manganese oxides or natural organic matter. In Lake Kuorinka sediment, dissolved Ag that originated from PVP-AgNPs was relatively more bioaccessible, also resulting in higher total body burden in L. variegatus than that from uncoated AgNPs or AgNO3. In artificial sediment and Lake H\u00f6yti\u00e4inen sediment, AgNO3 was significantly more bioaccessible than AgNPs. Our results highlight the importance of sediment properties and AgNP surface chemistry when evaluating the environmental exposure of AgNPs. Environ Toxicol Chem 2017;36:2593\u20132601. \u00a9 2017 SETAC<\/jats:p>\n               <\/jats:sec>","DOI":"10.1002\/etc.3798","type":"journal-article","created":{"date-parts":[[2017,3,17]],"date-time":"2017-03-17T11:45:07Z","timestamp":1489751107000},"page":"2593-2601","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Partitioning of nanoparticle-originated dissolved silver in natural and artificial sediments"],"prefix":"10.1093","volume":"36","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3369-0100","authenticated-orcid":false,"given":"Juho E.","family":"Rajala","sequence":"first","affiliation":[{"name":"Department of Biological and Environmental ScienceUniversity of Jyv\u00e4skyl\u00e4 Jyv\u00e4skyl\u00e4 Finland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Eeva-Riikka","family":"Vehni\u00e4inen","sequence":"additional","affiliation":[{"name":"Department of Biological and Environmental 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