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

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

1,* , 1
1,2,* , 3
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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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 (CC BY 3.0).

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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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