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DOI10.1039/c3en00017f
Natural water chemistry (dissolved organic carbon, pH, and hardness) modulates colloidal stability, dissolution, and antimicrobial activity of citrate functionalized silver nanoparticles
Pokhrel, Lok R.1,3; Dubey, Brajesh2; Scheuerman, Phillip R.1
发表日期2014-02-01
ISSN2051-8153
卷号1期号:1页码:45-54
英文摘要

Knowledge about whether/how natural water chemistry influences the fate, dissolution, and toxicity of silver nanoparticles (AgNPs) should contribute to ecological risk assessment and informed decision making. The effects of three critical water chemistry parameters - dissolved organic carbon (DOC), pH, and hardness - were investigated on the colloidal stability, dissolution dynamics, and antimicrobial activity of citrate-functionalized AgNPs (citrate-AgNPs) against Escherichia coli. Toxicities of citrate-AgNPs and AgNO3 were also determined in the river water samples collected across three seasons (for seven months). Detectable changes in hydrodynamic diameter, surface charge, and plasmonic resonance revealed the modulating effects of the water chemistry parameters on the colloidal stability of citrate-AgNPs. Although, overall Ag release from citrate-AgNPs was low (0.33-3.62%), it increased with increasing DOC concentrations (0-20 mg L-1) but decreased with increasing pH (5-7.5) or hardness (150-280 mg L-1). Citrate-AgNP toxicity was 3-44 fold lower than of AgNO3 (Ag mass basis). Notably, higher DOC or pH conferred protection to E. coli against citrate-AgNPs or AgNO3; increasing solution hardness tended to enhance toxicity, however. Citrate-AgNPs or AgNO3 toxicity in the river water matrix revealed no seasonality. Generalized linear models developed, by parameterizing particle properties, could fairly predict empirically-derived nanotoxicity. Our results show that particle size, surface properties, ion release kinetics, and toxicity of citrate-AgNPs can be modified upon release into aquatic environments, suggesting potential implications to ecosystem health and functions.


语种英语
WOS记录号WOS:000347971700005
来源期刊ENVIRONMENTAL SCIENCE-NANO
来源机构美国环保署
文献类型期刊论文
条目标识符http://gcip.llas.ac.cn/handle/2XKMVOVA/59338
作者单位1.E Tennessee State Univ, Coll Publ Hlth, Dept Environm Hlth, Johnson City, TN 37614 USA;
2.Univ Guelph, Sch Engn, Guelph, ON N1G 2W1, Canada;
3.US EPA, Natl Hlth & Environm Effects Res Lab, Corvallis, OR 97333 USA
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GB/T 7714
Pokhrel, Lok R.,Dubey, Brajesh,Scheuerman, Phillip R.. Natural water chemistry (dissolved organic carbon, pH, and hardness) modulates colloidal stability, dissolution, and antimicrobial activity of citrate functionalized silver nanoparticles[J]. 美国环保署,2014,1(1):45-54.
APA Pokhrel, Lok R.,Dubey, Brajesh,&Scheuerman, Phillip R..(2014).Natural water chemistry (dissolved organic carbon, pH, and hardness) modulates colloidal stability, dissolution, and antimicrobial activity of citrate functionalized silver nanoparticles.ENVIRONMENTAL SCIENCE-NANO,1(1),45-54.
MLA Pokhrel, Lok R.,et al."Natural water chemistry (dissolved organic carbon, pH, and hardness) modulates colloidal stability, dissolution, and antimicrobial activity of citrate functionalized silver nanoparticles".ENVIRONMENTAL SCIENCE-NANO 1.1(2014):45-54.
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