We introduce the concept of water-soluble natural dye (betanin) as a novel colorimetric sensor for the naked eye detection of copper ions in water samples. Such simple, green, fast, selective and low-cost colorimetric determination of Cu2+ ions would definitely enhance the environmental and economic benefits of this alternative form of synthetic chelating agent.
M. Khairy, M. Ismael, R. M. El-Khatib, M. Abdelnaeem and M. Khalaf, Anal. Methods, 2016, 8, 4977 DOI: 10.1039/C6AY00235H
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