Taheri H, Khayatian G. Smartphone-based microfluidic chip modified using pyrrolidine-1-dithiocarboxylic acid for simultaneous colorimetric determination of Cr
3+ and Al
3+ ions.
SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2022;
272:121000. [PMID:
35151170 DOI:
10.1016/j.saa.2022.121000]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2021] [Revised: 01/13/2022] [Accepted: 02/01/2022] [Indexed: 06/14/2023]
Abstract
A portable µ-chip-based colorimetric device was developed for the determination of Cr3+ and Al3+ ions. The silver nanoparticles were modified with pyrrolidine-1-dithiocarboxylic acid ammonium salt as a novel ligand for the first time. The color of modified AgNPs in the test zone immediately changes after the addition of Cr3+ and Al3+ ions. The resulting color changes were detected by the naked eye or were taken by a smartphone camera. The obtained images were analyzed by RGB software to assay the Cr3+ and Al3+ ions concentration. Under optimized experimental conditions, the linear ranges are 0.1-220 and 0.01-250 µM for Cr3+ and Al3+ ions, respectively. The probe has a limit of detections of 10.66 and 3.55 nM for Cr3+ and Al3+ in an aqueous solution. In the case of µ-chip, the concentration ranges are 0.1-200 μM and 0.01-220 μM for Cr3+ and Al3+ ions, with detection limits of 9.18 and 2.30 nM, respectively. The µ-chip showed great potential as a fast detection tool for the monitoring of Cr3+ and Al3+ ions in real samples such as river water samples.
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