Highly Stable and Sensitive Colorimetric Visualization of Trivalent Chromium Using Amido Black 10B-Stabilized Silver Nanoparticles
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Here, we report a highly stable and sensitive colorimetric assay for Cr3+ based on amido black 10B-stabilized silver nanoparticles (AgNPs) as the probes. The detection mechanism is that the coordination interaction between Cr3+ and amido black 10B on the surface of AgNPs causes the cross-linking/aggregation of amido black-stabilized AgNPs, generating a redshift of the absorption peak and a color change from yellow to pink. Under the optimized assay conditions, this colorimetric assay displays a good linear relationship (R 2 = 0.996) between relative absorbance ratios and the concentration of Cr3+ in the range of 0.05–20 μM, and the limit of detection (LOD) was estimated to be 0.01 μM by the UV-Vis spectra and 15 μM by the naked eye. Additionally, the colorimetric assay shows a good selectivity over other metal ions, and it is successfully applied to detection of Cr3+ in tap water, lake water, and river water samples with satisfactory recoveries.
KeywordsCr3+ Coordination Detection Silver nanoparticles Aggregation
We gratefully acknowledge the financial support of the Longshan Scholars Programme of Southwest University of Science and Technology (Grant No. 17LZX504) and the Teaching Reform Project of Southwest University of Science and Technology (Grant No. 15xn0077).
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