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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

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Received: 10 October 2010; in revised form: 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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MDPI and ACS Style

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.

AMA Style

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(12):11144-11155.

Chicago/Turabian Style

Ding, Nan; Cao, Qian; Zhao, Hong; Yang, Yimin; Zeng, Lixi; He, Yujian; Xiang, Kaixiang; Wang, Guangwei. 2010. "Colorimetric Assay for Determination of Lead (II) Based on Its Incorporation into Gold Nanoparticles during Their Synthesis." Sensors 10, no. 12: 11144-11155.



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