Fig. 5From: 4-Mercaptobenzoic acid-modified Au@Ag nanoparticle-based colorimetric Cr3+ ions detection in aqueous solutionOptimization of experimental conditions for Cr3+ ions detection with various concentrations, a images, b UV–Vis spectrum, c the relationship between A650nm/A410nm and Cr3+ ions concentration. The limit of detection was 9 μM and colorimetric detection of Cr3+ ions 10 μM. The linear range was from 10 to 500 μMBack to article page