Journal ArticleUnknown
Selective lead ion sensing via cotton pad-based Na2EDTA capped AuNPs: A smartphone-assisted colorimetric method
Authors
Author Affiliations
Khulna University, Georgia Institute of Technology, Shenzhen Institute of Information Technology, Egyptian Petroleum Research Institute, ...
Published InChemosphere
Year2025
Citations8
Abstract
Herein, Na2EDTA-capped AuNPs specifically designed for selective smartphone-assisted colorimetric detection are synthesized and characterized. Na2EDTA-capped AuNPs was synthesized and characterized by UV-Visible spectroscopy, ATR, Raman, XRD, SEM and EDX. The calculated activation energy of the produced nanoparticles was 0.2 eV. Using XRD and SEM, the average crystallite size was found to be approximately 25 nm. Only Pb2+ and Cd2+, among the following metal ions: Mg2+, K+, Ca2+, Co2+, Ni2+, Ba2+, Hg+, Bi2+, Pb2+, and Cd2+, caused the AuNa2EDTA solution's hue to shift from reddish in color to blue. Pb2+ and Cd2+ were distinguished using a Na2S solution. Cotton pad with AuNa2EDTA integrated served as the substrate for metal ion adsorption. The GIMP software-supported smartphone was used to implement the color…
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