Journal
MICROCHIMICA ACTA
Volume 181, Issue 15-16, Pages 1905-1915Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-014-1287-5
Keywords
DTC-CE-Au NPs; Pb(II) ion; UV-visible spectrometry; FT-IR; TEM and DLS
Categories
Funding
- Department of Science and Technology, India [SR/FT/CS-54/2010]
Ask authors/readers for more resources
We have developed a crown ether based selective colorimetric sensing scheme for the determination of Pb(II) ion by using gold nanoparticles modified with dithiocarbamate derivative of 4'-aminobenzo-18-crown-6 that acts as a colorimetric probe. Monodisperse Au-NPs were prepared by reacting 4'-aminobenzo-18-crown-6 with carbon disulfide to generate the dithiocarbamate ligand which was then added to the Au-NPs to form a supramolecular assembly on their surface. The Au-NPs modified in this way undergo aggregation in the presence of Pb(II) ions, and this causes the color to change from red to blue. The Pb(II)-induced aggregation can be monitored by using UV-visible spectrometry and even with the bare eye. The absorbance ratio (A(650nm)/A(520nm)) is linearly related to the concentration of Pb(II) in the 0.1 to 75 mu M range (with a correlation coefficient of 0.9957), and the detection limit is 50 nM which is lower than the allowable level (75 nM) as defined by the US EPA. The method was successfully applied to the determination of Pb(II) in spiked water samples.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available