Journal
CHEMOSPHERE
Volume 89, Issue 7, Pages 900-906Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2012.05.017
Keywords
Toxicity; CdSe/ZnS quantum dots; Organic compounds; UV exposure; Leak of Cu and Zn; Spearman rank coefficient
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Funding
- Department of Defense through US Army Engineer Research and Development Center [W912HZ-06-C-0057]
- NSF through Interdisciplinary Nanotoxicity Center NSF-CREST [HRD-0833178]
- EPSCoR [0556308]
- JSUAdvance Grant [1008708]
- EPSCoR
- Office Of The Director [0556308, 903787] Funding Source: National Science Foundation
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The paper reports unforeseen results of increased toxicity of water, subsequent to interactions between CdSe/ZnS quantum dots (QDs), phenol and toluene under UV irradiation. The consistent pattern of changes in measured toxicity (TU) was observed and correlated with degradation of phenol and/or toluene. Spearman rank coefficients (SRCs) for data pairs sum-parameters vs. TU were calculated. The highest correlation between toxicity and degradation by-products was observed for hydroquinone (0.86) and catechol (0.89). The presence of QDs in tested concentration range in the absence of UV has shown low toxicity and no interactions with phenol and/or toluene. The leak of constituent core and shell metal ions was observed. The minor differences in physical characteristics of tested QDs of the same chemical composition led to rather different degradation patterns of phenol and toluene, and the amount of leak of the metal ions as well. (C) 2012 Elsevier Ltd. All rights reserved.
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