PMID- 19943676
OWN - NLM
STAT- MEDLINE
DCOM- 20100205
LR  - 20131121
IS  - 0013-936X (Print)
IS  - 0013-936X (Linking)
VI  - 43
IP  - 23
DP  - 2009 Dec 1
TI  - Influence of multiwalled carbon nanotubes dispersed in natural organic matter on 
      speciation and bioavailability of copper.
PG  - 8979-84
LID - 10.1021/es900647f [doi]
AB  - 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.
FAU - Kim, Ki-Tae
AU  - Kim KT
AD  - Department of Environmental Science and Engineering, Gwangju Institute of Science 
      and Technology (GIST), Buk-gu, Gwangju 500-712, Korea.
FAU - Edgington, Aaron J
AU  - Edgington AJ
FAU - Klaine, Stephen J
AU  - Klaine SJ
FAU - Cho, Jae-Weon
AU  - Cho JW
FAU - Kim, Sang D
AU  - Kim SD
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - United States
TA  - Environ Sci Technol
JT  - Environmental science & technology
JID - 0213155
RN  - 0 (Nanotubes, Carbon)
RN  - 0 (Organic Chemicals)
RN  - 0 (Reactive Oxygen Species)
RN  - 789U1901C5 (Copper)
SB  - IM
MH  - Animals
MH  - Biological Assay
MH  - Biological Availability
MH  - Copper/*metabolism
MH  - Daphnia/*metabolism
MH  - Nanotubes, Carbon/*chemistry
MH  - Organic Chemicals/*chemistry
MH  - Reactive Oxygen Species/metabolism
MH  - Spectroscopy, Fourier Transform Infrared
MH  - Survival Analysis
MH  - Titrimetry
EDAT- 2009/12/01 06:00
MHDA- 2010/02/06 06:00
CRDT- 2009/12/01 06:00
PHST- 2009/12/01 06:00 [entrez]
PHST- 2009/12/01 06:00 [pubmed]
PHST- 2010/02/06 06:00 [medline]
AID - 10.1021/es900647f [doi]
PST - ppublish
SO  - Environ Sci Technol. 2009 Dec 1;43(23):8979-84. doi: 10.1021/es900647f.