Novel, highly selective detection of Cr(III) in aqueous solution based on a gold nanoparticles colorimetric assay and its application for determining Cr(VI)

Gold nanoparticles as efficient sensors in colorimetric detection of toxic metal ions: A review

“…It is based on the strong bonding interaction between Au and S group. A number of thiol containing molecules as alkanethiolates, glutathione, sulphur containing compounds as xanthates, disulfide, thioethers , dithiocarbamate have been reported to be used for generation of functionalized GNPs [35][36][37][38][39]40]. Based on the above three phenomenon, numerous functionalized GNPs have been generated and used in detection and sensing applications.…”

Facile Preparation of 2,6‐Pyridinedicarb­oxylic Acid Protected Gold Nanoparticles with Sensitive Chromium‐Ion Sensing and Efficient Catalysis

“…[44,45] Otherwise, the recognition mechanism for the detection of Cr 3+ ions for a specific ligand results from its electron configuration. [35] Owing to the outermost electron configuration of the Cr 3+ ion, it is a strong receptor of electrons to half-fill the d orbitals. In accordance with the general coordination number of six and the outermost electron configuration of 3d 0 for Cr 3+ ions, [35] trivalent chromium has a higher effective charge, smaller radius, and stronger coordination ability than the other transitionmetal ions.…”

“…[35] Owing to the outermost electron configuration of the Cr 3+ ion, it is a strong receptor of electrons to half-fill the d orbitals. In accordance with the general coordination number of six and the outermost electron configuration of 3d 0 for Cr 3+ ions, [35] trivalent chromium has a higher effective charge, smaller radius, and stronger coordination ability than the other transitionmetal ions. For the detection strategy, the interaction between the Cr 3+ ions and the carboxy groups results in the close aggregation of the AuNPs.…”

“…Zhu and co-workers reported the detection of Cr 3+ and Cr 6+ ions by AuNPs modified with a dithiocarbamate-modified N-benzyl-4-(pyridin-4-ylmethyl)aniline ligand with a detection limit of 31 ppb. [35] The Lin group used gold nanoparticles coated with a monoclonal antibody for the detection of Cr 3+ and Cr 6+ ions in water and serum samples. A test strip with a limit of 50.0 ng mL -1 was developed for the detection.…”

A colorimetric probe based on desensitized ionene-stabilized gold nanoparticles for single-step test for sulfate ions

“…Lots of colorimetric techniques based on AuNPs for the determination of different organic compounds [10][11][12][13][14][15][16][17][18], metal ions [19][20][21][22][23][24][25][26][27][28], and other analytes have been suggested for the past ten years. The AuNPs-based colorimetric platform has also found an application for sensing anions, including dihydrophosphate [29,30], hydrophosphate [31], fluoride [32,33], cyanide [34], nitrite [35], sulfide [36], and hypochlorite [37].…”