NDLI: Impact of chemical composition of ecotoxicological test media on the stability and aggregation status of silver nanoparticles

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Environmental Science: Nano Vol - 3 Issue - 1

Environmental Science: Nano Vol -2

Environmental Science: Nano Vol -1

Impact of chemical composition of ecotoxicological test media on the stability and aggregation status of silver nanoparticles

Content Provider	Royal Society of Chemistry (RSC)
Author	Seitz, Frank Bundschuh, Mirco Schaumann, Gabriele E. Schulz, Ralf Philippe, Allan Metreveli, George Grün, Alexandra Frombold, Bianca Manz, Werner Rosenfeldt, Ricki R.
Copyright Year	2016
Abstract	Understanding of the interplay of generally known colloidal transformations under conditions of test media (TM) used during cultivation of organisms and biological effect (=ecotoxicological) studies is still limited, although this knowledge is required for an adequate interpretation of test outcomes and for a comparison among different studies. In this context, we investigated the aggregation and dissolution dynamics of citrate-stabilized silver nanoparticles (Ag NPs) by varying the composition of three TM (ASTM, SAM-5S, and R2A, used during bioassays with Daphnia magna, Gammarus fossarum, and bacterial biofilms, respectively) in the presence and absence of two types of natural organic matter (NOM), namely, Suwanee River humic acid (SRHA) and seaweed extract (SW). Each original test medium induced reaction-limited aggregation of Ag NPs, and aggregation increased from R2A to SAM-5S and ASTM. In addition to the differences in aggregation dynamics, the concentration and speciation of Ag(I) differed between the three TM, whereby SAM-5S and ASTM are comparable with respect to the nature of the aggregation process but clearly differ from the R2A medium. Furthermore, Cl−, mainly present in SAM-5S, induced NP stabilization. The release of silver ions from Ag NPs was controlled by the presence of NOM and organic constituents of TM and by interactions with Cl− and Br−. The degree of aggregation, formation of interparticle cation–NOM bridges or stabilization was larger for Ca2+ than for Mg2+ due to the stronger ability of Ca2+ to interact with citrate or NOM compared to Mg2+. These observations and the dependence of aggregation rates on the particle concentration renders the interpretation of dose–response relationships challenging, but they may open perspectives for targeted ecotoxicological testing by modifications of TM composition.
Starting Page	418
Ending Page	433
Page Count	16
File Format	HTM / HTML PDF
ISSN	20518153
Volume Number	3
Issue Number	2
Journal	Environmental Science: Nano
DOI	10.1039/c5en00152h
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Subscribed
Subject Keyword	ASTM NP NOM Suwanee River Interplay Entertainment ASTM International Haplogroup R2a Daphnia Gammarus Suwannee River Acid Algae Speciation Interaction Citric acid Correlation and dependence
Content Type	Text
Resource Type	Article
Subject	Environmental Science Materials Science

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