title: A sensitive and selective sensing platform based on CdTe QDs in the presence of l-cysteine for detection of silver, mercury and copper ions in water and various drinks.
abstract: Water soluble CdTe quantum dots (QDs) have been prepared simply by one-pot method using potassium tellurite as stable tellurium source and thioglycolic acid (TGA) as stabilizer. The fluorescence of CdTe QDs can be improved 1.3-fold in the presence of l-cysteine (Cys), however, highly efficiently quenched in the presence of silver or mercury or copper ions. A sensitive and selective sensing platform for analysis of silver, mercury and copper ions has been simply established based on CdTe QDs in the presence of l-cysteine. Under the optimum conditions, excellent linear relationships exist between the quenching degree of the sensing platform and the concentrations of Ag(+), Hg(2+) and Cu(2+) ranging from 0.5 to 40ngmL(-1). By using masking agents of sodium diethyldithiocarbamate (DDTC) for Ag(+) and Cu(2+), NH4OH for Ag(+) and Hg(2+) and 1-(2-Pyridylazo)-2-naphthol (PAN) for Hg(2+) and Cu(2+), Hg(2+), Cu(2+) and Ag(+) can be exclusively detected in coexistence with other two ions, and the detection limits (3σ) were 0.65, 0.063 and 0.088ngmL(-1) for Ag(+), Hg(2+) and Cu(2+), respectively. This effective sensing platform has been used to detection of Ag(+), Hg(2+) and Cu(2+) in water and various drinks with satisfactory results.
authors.affiliation: Hubei Collaborative Innovation Center for Rare Metal Chemistry, Hubei Key Laboratory of Pollutant Analysis & Reuse Technology, Institute for Advanced Materials, College of Chemistry and Chemical Engineering, Hubei Normal University, Huangshi 435002, China.
authors.forename: Tingting
authors.initials: T
authors.lastname: Gong
authors.affiliation: Department of Clinical Laboratory, The Second Hospital of Huangshi, Huangshi 435002, China.
authors.forename: Junfeng
authors.initials: J
authors.lastname: Liu
authors.affiliation: Hubei Collaborative Innovation Center for Rare Metal Chemistry, Hubei Key Laboratory of Pollutant Analysis & Reuse Technology, Institute for Advanced Materials, College of Chemistry and Chemical Engineering, Hubei Normal University, Huangshi 435002, China.
authors.forename: Xinxin
authors.initials: X
authors.lastname: Liu
authors.affiliation: Hubei Collaborative Innovation Center for Rare Metal Chemistry, Hubei Key Laboratory of Pollutant Analysis & Reuse Technology, Institute for Advanced Materials, College of Chemistry and Chemical Engineering, Hubei Normal University, Huangshi 435002, China.
authors.forename: Jie
authors.initials: J
authors.lastname: Liu
authors.affiliation: Hubei Collaborative Innovation Center for Rare Metal Chemistry, Hubei Key Laboratory of Pollutant Analysis & Reuse Technology, Institute for Advanced Materials, College of Chemistry and Chemical Engineering, Hubei Normal University, Huangshi 435002, China.
authors.forename: Jinkun
authors.initials: J
authors.lastname: Xiang
authors.affiliation: Hubei Collaborative Innovation Center for Rare Metal Chemistry, Hubei Key Laboratory of Pollutant Analysis & Reuse Technology, Institute for Advanced Materials, College of Chemistry and Chemical Engineering, Hubei Normal University, Huangshi 435002, China. Electronic address: chemwuyiwei@163.com.
authors.forename: Yiwei
authors.initials: Y
authors.lastname: Wu
mesh_terms: D001628:Beverages; D003300:Copper / Q000032:analysis*; D003545:Cysteine; D057230:Limit of Detection; D008628:Mercury / Q000032:analysis*; D045663:Quantum Dots; D012834:Silver / Q000032:analysis*; D013050:Spectrometry, Fluorescence / Q000379:methods; D014867:Water / Q000737:chemistry*
chemical_list: D014867:Water; D012834:Silver; D003300:Copper; D008628:Mercury; D003545:Cysteine
keywords: Cys-CdTe QDs; Fluorescence spectrofluorometer; Silver, mercury and copper ions; Water and tea infusion