title: Selective detection of trace Cr3+ in aqueous solution by using 5,5'-dithiobis (2-nitrobenzoic acid)-modified gold nanoparticles.
abstract: A simply prepared gold nanoparticle-based sensor, 5,5'-dithiobis (2-nitrobenzoic acid) (DTNBA)-modified gold nanoparticles, was prepared to explore the sensitive and selective detection of metal ions using a colorimetric technique. The selective detection of trace levels (93.6 ppb) Cr3+ in aqueous solution was achieved over 15 other metal ions. The functionalized gold nanoparticles became aggregated in solution in the presence of Cr3+ by an ion-templated chelation process, which caused an easily measurable change in the extinction spectrum of the particles and provided an inherently sensitive method for Cr3+ detection in aqueous solution.
authors.affiliation: State Key Laboratory of Supramolecular Structure and Materials, No. 2699 Qianjin Street, Jilin University, Changchun 130012, China.
authors.forename: Yong-Qiang
authors.initials: YQ
authors.lastname: Dang
authors.forename: Hong-Wei
authors.initials: HW
authors.lastname: Li
authors.forename: Bin
authors.initials: B
authors.lastname: Wang
authors.forename: Lei
authors.initials: L
authors.lastname: Li
authors.forename: Yuqing
authors.initials: Y
authors.lastname: Wu
mesh_terms: D002412:Cations; D002614:Chelating Agents / Q000737:chemistry; D002857:Chromium / Q000737:chemistry; D003124:Colorimetry / Q000379:methods; D004228:Dithionitrobenzoic Acid / Q000737:chemistry; D006046:Gold / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007477:Ions; D053768:Metal Nanoparticles; D008670:Metals / Q000737:chemistry; D036103:Nanotechnology / Q000379:methods*; D012997:Solvents / Q000737:chemistry; D014466:Ultraviolet Rays; D014867:Water / Q000737:chemistry
chemical_list: D002412:Cations; D002614:Chelating Agents; D007477:Ions; D008670:Metals; D012997:Solvents; D014867:Water; D002857:Chromium; D006046:Gold; D004228:Dithionitrobenzoic Acid