title: CdTe/ZnS quantum dots as fluorescent probes for ammonium determination.
abstract: Novel CdTe/ZnS quantum dot (QD) probes based on the quenching effect were proposed for the simple, rapid, and specific determination of ammonium in aqueous solutions. The QDs were modified using 3-mercaptopropionic acid, and the fluorescence responses of the CdTe/ZnS QD probes to ammonium were detected through regularity quenching. The quenching levels of the CdTe/ZnS QDs and ammonium concentration showed a good linear relationship between 4.0 × 10(-6) and 5.0 × 10(-4) mol/L; the detection limit was 3.0 × 10(-7) mol/L. Ammonium contents in synthetic explosion soil samples were measured to determine the practical applications of the QD probes and a probable quenching mechanism was described. Copyright © 2015 John Wiley & Sons, Ltd.
authors.affiliation: Department of Forensic Chemistry, National Police University of China, Shenyang, 110035, People's Republic of China.
authors.forename: Kui-Yu
authors.initials: KY
authors.lastname: Yi
mesh_terms: D064751:Ammonium Compounds / Q000032:analysis*; D019187:Cadmium Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D005456:Fluorescent Dyes / Q000737:chemistry*; D010316:Particle Size; D045663:Quantum Dots; D013440:Sulfides / Q000138:chemical synthesis / Q000737:chemistry*; D013499:Surface Properties; D013691:Tellurium / Q000737:chemistry*; D017967:Zinc Compounds / Q000138:chemical synthesis / Q000737:chemistry*
chemical_list: D064751:Ammonium Compounds; D019187:Cadmium Compounds; D005456:Fluorescent Dyes; D013440:Sulfides; D017967:Zinc Compounds; C031238:zinc sulfide; D013691:Tellurium; C028337:cadmium telluride
keywords: CdTe/ZnS quantum dots; ammonium; fluorescent probes; quenching effect