BROWSE

Related Researcher

Author's Photo

Cho, Jaeweon
OWIELAB(Organic-Water Interface Engineering Laboratory)
Research Interests
  • Convergence of Science and Arts, Feces Standard Money (FSM), Water & Energy

ITEM VIEW & DOWNLOAD

Influence of Multiwalled Carbon Nanotubes Dispersed in Natural Organic Matter on Speciation and Bioavailability of Copper

Cited 33 times inthomson ciCited 33 times inthomson ci
Title
Influence of Multiwalled Carbon Nanotubes Dispersed in Natural Organic Matter on Speciation and Bioavailability of Copper
Author
Kim, Ki-TaeEdgington, Aaron J.Klaine, Stephen J.Cho, Jae-WeonKim, Sang D.
Keywords
Binding affinities; Daphnia magna; Fourier transform infrared; FTIR; Ion activities; Natural organic matters; Nontoxic concentrations; Reactive oxygen species; Steric stabilization
Issue Date
2009-12
Publisher
AMER CHEMICAL SOC
Citation
ENVIRONMENTAL SCIENCE & TECHNOLOGY, v.43, no.23, pp.8979 - 8984
Abstract
The dispersion of multiwalled carbon nanotubes (MWNTs) by natural organic matter (NOM) may influence the bioavailability of MWNTs and other contaminants. The speciation and bioavailability of copper (Cu) in MWNTs-associated NOM was studied using Daphnia magna. Cu titration data indicated that the binding affinity of Cu for MWNTs-associated NOM was lower than that for NOM alone. The free Cu(2+) ion activity was increased even by the addition of a low nontoxic concentration of 1.0 mg/L MWNTs. The 96 h LC(50) of MWNTs was determined to be 2.48 mg/L. The Fourier transform infrared (FTIR) spectra results showed clearly different features in Cu spiked between NOM and MWNTs-associated NOM, indicating that the interruption of Cu binding was probably due to steric stabilization of the MWNTs dispersed in NOM, which inhibited the complexation by rendering the functional groups in NOM less favorable to Cu. The mortality and biochemical reactive oxygen species (ROS) production in the D. magna bioassay were enhanced in MWNTs-associated NOM compared to NOM alone because of increased free Cu(2+) ion activity as expected from the titration and FTIR results. This study suggests the bioavailability of Cu is enhanced by the presence of MWNTs interacting with NOM
URI
Go to Link
DOI
10.1021/es900647f
ISSN
0013-936X
Appears in Collections:
UEE_Journal Papers
Files in This Item:
es900647f.pdf Download

find_unist can give you direct access to the published full text of this article. (UNISTARs only)

Show full item record

qrcode

  • mendeley

    citeulike

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

MENU