Issue 14, 2021

Colorimetric recognition of lanthanide ions with a complexometric indicator array

Abstract

A colorimetric sensor array based on complexometric indicators is proposed for pattern recognition of lanthanide ions. The complexometric indicators have abundant functional groups and can act as a platform for chromogenic reaction with various metal ions, including lanthanide ions. The subtle difference of the lanthanide ions’ structure results in the difference of absorbance response between lanthanide ions and two chromogenic indicators (Alizarin Red and Erichrome Black T) in Tris-HCl buffer with two different pHs (i.e., pH 7.4 and pH 8.5, colorimetric sensor array). Fourteen lanthanide ions were distinguished well with the newly designed colorimetric sensor array. The sensor array has the potential to distinguish between different concentrations of lanthanide ions and their mixtures. Moreover, the results in actual samples indicate the future practical applications of this sensor array in environmental analysis.

Graphical abstract: Colorimetric recognition of lanthanide ions with a complexometric indicator array

Supplementary files

Article information

Article type
Communication
Submitted
24 apr 2021
Accepted
07 jun 2021
First published
07 jun 2021

Analyst, 2021,146, 4441-4445

Colorimetric recognition of lanthanide ions with a complexometric indicator array

T. Zhang, X. Zhuo, G. Shi and M. Zhang, Analyst, 2021, 146, 4441 DOI: 10.1039/D1AN00710F

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