Issue 1, 2015

Trace copper ion detection by the suppressed decolorization of chromotrope 2R complex

Abstract

Chromotrope 2R (CR) is a monoazo dye, which can be easily degraded under ultraviolet C (UVC) light irradiation. However, the degradation extent of CR is suppressed after it is chelated with Cu2+ ions to form a coordination complex (Cu2+–CR). This phenomenon was developed as a novel method for the quantitative detection of Cu2+ ions, which is based on determining the change in absorbance (ΔA, the absorbance of Cu2+–CR complex subtracted by that of CR after UVC light irradiation) by UV-visible absorption spectrum. Under the optimal detection conditions, ΔA at 509 nm highly depends on the concentration of Cu2+ ions in the range from 5.0 × 10−9 to 1.0 × 10−6 M as expressed by the following equation: ΔA = 0.3066 + 0.03605 lg c with the correlation coefficient of r = 0.9912. The limit of detection (ld) is 3.4 nM as calculated by the formula 3σ = 0.3066 + 0.03605 lg ld. This method provides affordable and selective detection of Cu2+ ions and was used to detect Cu2+ ions in a human hair sample.

Graphical abstract: Trace copper ion detection by the suppressed decolorization of chromotrope 2R complex

Supplementary files

Article information

Article type
Paper
Submitted
10 Oct 2014
Accepted
30 Oct 2014
First published
31 Oct 2014

Anal. Methods, 2015,7, 266-270

Author version available

Trace copper ion detection by the suppressed decolorization of chromotrope 2R complex

L. Fu, Y. Xiong, S. Chen and Y. Long, Anal. Methods, 2015, 7, 266 DOI: 10.1039/C4AY02414A

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