title: Facile colorimetric detection of Hg2+ based on anti-aggregation of silver nanoparticles.
abstract: This paper describes an investigation of a facile colorimetric sensor for Hg(2+) in aqueous solution based on the anti-aggregation of silver nanoparticles (AgNPs). In the absence of Hg(2+), the addition of 6-Thioguanine to AgNPs solution led to the aggregation of AgNPs, resulting in a color change from yellow to brown with a red shift of absorption spectra. However, the presence of Hg(2+) inhibited the 6-Thioguanine-induced aggregation of AgNPs accompanying with a color change from brown to yellow. Under the optimal conditions, the ratio between the absorbance at 530 nm and 394 nm (A530/A394) was linearly proportional to the Hg(2+) concentration in a range from 0 to 333 nM with a detection limit of 4 nM. Other environmentally relevant metal ions did not interfere with the detection of Hg(2+). The proposed method was simple, cost-effective and rapid without any complicated modifying step. It was successfully applied to detect Hg(2+) in environmental water samples.
authors.affiliation: College of Chemistry and Material Science, Shandong Agricultural University, Tai׳an, Shandong 271018, PR China. Electronic address: duanjl@sdau.edu.cn.
authors.forename: Junling
authors.initials: J
authors.lastname: Duan
authors.affiliation: College of Chemistry and Material Science, Shandong Agricultural University, Tai׳an, Shandong 271018, PR China.
authors.forename: Hongzong
authors.initials: H
authors.lastname: Yin
authors.affiliation: College of Chemistry and Material Science, Shandong Agricultural University, Tai׳an, Shandong 271018, PR China.
authors.forename: Ranran
authors.initials: R
authors.lastname: Wei
authors.affiliation: College of Chemistry and Material Science, Shandong Agricultural University, Tai׳an, Shandong 271018, PR China.
authors.forename: Weiwei
authors.initials: W
authors.lastname: Wang
mesh_terms: D002413:Cations, Divalent / Q000032:analysis; D003124:Colorimetry / Q000379:methods*; D057230:Limit of Detection; D008628:Mercury / Q000032:analysis*; D053758:Nanoparticles / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*; D013866:Thioguanine / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D002413:Cations, Divalent; D014874:Water Pollutants, Chemical; D012834:Silver; D013866:Thioguanine; D008628:Mercury
keywords: 6-Thioguanine; Anti-aggregation; Colorimetric sensor; Mercury; Silver nanoparticle