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Issue 6, 2015
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Visual detection of trace copper(ii) based on its catalytic action in the dissociation of thiosulfate

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Abstract

In this study, we report a new method for the detection of Cu2+ based on triangular silver nanoplates (TAg-NPs), which could be corroded by sodium thiosulfate (Na2S2O3). TAg-NPs with blue color can be changed to yellow color in the presence of a certain concentration of Na2S2O3, however, its color change is unclear when Na2S2O3 was heated in the presence of Cu2+. The reason may be that Na2S2O3 dissociates on heating in the presence of Cu2+, which leads the concentration of Na2S2O3 to be decreased. Furthermore, when the heating time is fixed, the decrease in the concentration of Na2S2O3 is proportional to the concentration of Cu2+. As a result, the color of the mixture solution of TAg-NP/Cu2+/Na2S2O3 and the absorbance at the position of the maximum absorption peak of TAg-NPs changed with the change in the concentration of Cu2+. The changes in the values of absorbance (ΔA, the absorbance of TAg-NP/Cu2+/Na2S2O3 subtracted from that of TAg-NP/Na2S2O3 at the position of the maximum absorption peak) were proportional to the concentrations of Cu2+. Thus, a new method was established by studying the UV-vis absorption spectrum or the naked eye observation, which is simple, fast and of low cost for copper ion detection. Using this method, the concentration of Cu2+ could be detected accurately in the range of 2.5 × 10−9 to 7.5 × 10−7 mol L−1 with the correlation coefficient of r = 0.9983. Moreover, the color change of TAg-NPs could be observed in the Cu2+ concentration of 2.5 × 10−8 to 7.5 × 10−7 mol L−1.

Graphical abstract: Visual detection of trace copper(ii) based on its catalytic action in the dissociation of thiosulfate

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Supplementary files

Article information


Submitted
27 Jan 2015
Accepted
01 Feb 2015
First published
02 Feb 2015

Anal. Methods, 2015,7, 2542-2546
Article type
Paper
Author version available

Visual detection of trace copper(II) based on its catalytic action in the dissociation of thiosulfate

X. Y. Hou, S. Chen, J. Tang, Y. F. Long and L. Zhu, Anal. Methods, 2015, 7, 2542
DOI: 10.1039/C5AY00227C

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