Biotic and Abiotic Interactions in Aquatic Microcosms Determine Fate and Toxicity of Ag Nanoparticles: Part 2-Toxicity and Ag Speciation

被引:111
作者
Bone, Audrey J. [1 ,2 ]
Colman, Benjamin P. [1 ,3 ]
Gondikas, Andreas P. [1 ]
Newton, Kim M. [4 ,5 ]
Harrold, Katherine H. [6 ]
Cory, Rose M. [6 ]
Unrine, Jason M. [1 ,7 ]
Klaine, Stephen J. [4 ,8 ]
Matson, Cole W. [1 ,9 ,10 ]
Di Giulio, Richard T. [1 ,2 ]
机构
[1] Duke Univ, Ctr Environm Implicat NanoTechnol CEINT, Durham, NC 27708 USA
[2] Duke Univ, Nicholas Sch Environm, Durham, NC 27708 USA
[3] Duke Univ, Dept Biol, Durham, NC 27708 USA
[4] Clemson Univ, Inst Environm Toxicol CU ENTOX, Pendleton, SC 29670 USA
[5] Clemson Univ, Grad Program Environm Toxicol, Clemson, SC 29634 USA
[6] Univ N Carolina, Gillings Sch Global Publ Hlth, Chapel Hill, NC 27599 USA
[7] Univ Kentucky, Dept Plant & Soil Sci, Lexington, KY 40546 USA
[8] Clemson Univ, Dept Biol Sci, Clemson, SC 29634 USA
[9] Baylor Univ, Dept Environm Sci, Waco, TX 76798 USA
[10] Baylor Univ, Ctr Reservoir & Aquat Syst Res, Waco, TX 76798 USA
基金
美国国家科学基金会;
关键词
DISSOLVED ORGANIC-MATTER; SILVER NANOPARTICLES; BIOAVAILABILITY; NANOMATERIALS; CYTOTOXICITY; MECHANISM; BEHAVIOR;
D O I
10.1021/es204683m
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
To study the effects of complex environmental media on silver nanoparticle (AgNP) toxicity, AgNPs were added to microcosms with freshwater sediments and two species of aquatic plants (Potamogeton diversifolius and Egeria densa), followed by toxicity testing with microcosm surface water. Microcosms were designed with four environmental matrices in order to determine the contribution of each environmental compartment to changes in toxicity: water only (14 water + sediment (WS), water + plants (WP), and water + plants + sediment (WPS). Silver treatments included AgNPs with two different coatings, gum arabic (GA-AgNPs) or polyvinylpyrollidone (PVP-AgNPs), as well as AgNO3. Water samples taken from the microcosms at 24 h postdosing were used in acute toxicity tests with two standard model organisms, early life stage zebrafish (Danio rerio) and Daphnia magna. Speciation of Ag in these samples was analyzed using Ag L3-edge X-ray absorption near edge spectroscopy (XANES). Silver speciation patterns for the nanoparticle treatments varied significantly by coating type. While PVP-AgNPs were quite stable and resisted transformation matrices (>92.4% Ag(0)), GA-AgNP speciation patterns suggest significantly higher transformation rates, especially in treatments with plants (<69.2% and <58.8% Ag(0) in WP and VVPS, respectively) and moderately increased transformation with sediments (<85.6% Ag(0)). Additionally, the presence of plants in the microcosms (with and without sediments) reduced both the concentration of Ag in the water column and toxicity for all Ag treatments. Reductions in toxicity may have been related to decreased water column concentrations as well as changes in the surface chemistry of the particles induced by organic substances released from the plants.
引用
收藏
页码:6925 / 6933
页数:9
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