Issue 11, 2012

Using gallic acid-modified gold nanoassemblies to detect the Pb2+ of tea

Abstract

The growth and assembly of GNPs are carried out in a one-step procedure using gallic acid (GA) as reducer and stabilizer. Due to the coordination behavior of Pb2+ with the GA molecularly bonded onto the surface of GNPs, the nanoassemblies can be used to quantitatively detect Pb2+ in aqueous media with high sensitivity when the pH of the solution is above 4.2. The spectra were monitored by a UV-vis-near-infrared (NIR) spectrophotometer, and the wavelength changes were adopted as detection signals. The detection limit of this sensor to Pb2+ concentration is 10−9 M, and the linear response range of Pb2+ concentration is from 2.68 × 10−8 M to 4.95 × 10−6 M. The method was used to detect the lead content of tea, and a good result was obtained which was consistent with that from ICP-MS.

Graphical abstract: Using gallic acid-modified gold nanoassemblies to detect the Pb2+ of tea

Supplementary files

Article information

Article type
Paper
Submitted
25 Jun 2012
Accepted
16 Aug 2012
First published
17 Aug 2012

Anal. Methods, 2012,4, 3570-3574

Using gallic acid-modified gold nanoassemblies to detect the Pb2+ of tea

C. Jiang, M. Ma and Y. Wang, Anal. Methods, 2012, 4, 3570 DOI: 10.1039/C2AY25648G

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