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Sensors 2010, 10(12), 11144-11155; doi:10.3390/s101211144
Article

Colorimetric Assay for Determination of Lead (II) Based on Its Incorporation into Gold Nanoparticles during Their Synthesis

1
, 1
, 1,* , 1
, 1
, 1,2,* , 3
 and 4,*
1 College of Chemistry and Chemical Engineering, Graduate University of Chinese Academy of Sciences, 19A YuQuan Road, Beijing 100049, China 2 State Key Laboratory of Natural and Biomimetic Drugs, Peking University, Beijing 100191, China 3 Huaihua Medical College, Hunan, 418000, China 4 Medical College, Hunan Normal University, Changsha, Hunan 410006, China
* Authors to whom correspondence should be addressed.
Received: 10 October 2010 / Revised: 15 November 2010 / Accepted: 2 December 2010 / Published: 7 December 2010
(This article belongs to the Special Issue 10 Years Sensors - A Decade of Publishing)
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Abstract

In this report, we present a new method for visual detection of Pb2+. Gold nanoparticles (Au-NPs) were synthesized in one step at room temperature, using gallic acid (GA) as reducer and stabilizer. Pb2+ is added during the gold nanoparticle formation. Analysis of Pb2+ is conducted by a dual strategy, namely, colorimetry and spectrometry. During Au-NPs synthesis, addition of Pb2+ would lead to formation of Pb-GA complex, which can induce the aggregation of newly-formed small unstable gold nanoclusters. Consequently, colorimetric detection of trace Pb2+ can be realized. As the Pb2+ concentration increases, the color turns from red-wine to purple, and finally blue. This method offers a sensitive linear correlation between the shift of the absorption band (Δλ) and logarithm of Pb2+ concentration ranging from 5.0 × 10−8 to 1.0 × 10−6 M with a linear fit coefficient of 0.998, and a high selectivity for Pb2+ detection with a low detection limit down to 2.5 × 10−8 M.
Keywords: visual detection; lead ions; gold nanoparticles; gallic acid visual detection; lead ions; gold nanoparticles; gallic acid
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Ding, N.; Cao, Q.; Zhao, H.; Yang, Y.; Zeng, L.; He, Y.; Xiang, K.; Wang, G. Colorimetric Assay for Determination of Lead (II) Based on Its Incorporation into Gold Nanoparticles during Their Synthesis. Sensors 2010, 10, 11144-11155.

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