Fig. 8From: Colorimetric detection of Cr3+ based on gold nanoparticles functionalized with 4-mercaptobenzoic acidThe modified AuNPs in the presence of Cr3+ or other interferents. UV-vis spectra of 4-MBA-AuNPs in presence of a metal ions and c anions. Absorption ratio (A635nm and A520nm) obtained for 4-MBA-AuNPs with b metal ions and d anions. The concentration of Cr3+ and interferents were all 1 × 10−4 MBack to article page