A novel method for iodate determination using cadmium sulfide quantum dots as fluorescence probes.
We have developed a novel method for the determination of iodate based on the carboxymethyl cellulose-capped CdS quantum dots (QDs). Factors affecting the iodate detection were investigated, and the optimum conditions were determined. Under the optimum conditions, the relative fluorescence intensity of CdS quantum dots was linearly proportional to IO(3)(-) over a concentration range from 1.0 × 10(-8) to 1.0 × 10(-5) mol L(-1) with a correlation coefficient of 0.9987 and a detection limit of 6.0 nmol L(-1). Iodide, being oxidized by bromine to form iodate, was detected indirectly. The method was successfully applied to the determination of iodate and total amount of iodine in table salt samples. The related mechanism was also discussed.
Tang
Chun-Ran
CR
Key Laboratory of Theoretical Chemistry and Molecular Simulation of Ministry of Education of China, School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, PR China.
Su
Zhong-hua
ZH
Lin
Bao-Gang
BG
Huang
Hao-Wen
HW
Zeng
Yun-Long
YL
Li
Shuang
S
Huang
He
H
Wang
Ya-Jing
YJ
Li
Chun-Xiang
CX
Shen
Guo-Li
GL
Yu
Ru-Qin
RQ
D019187:Cadmium Compounds / Q000737:chemistry; D002266:Carboxymethylcellulose Sodium / Q000737:chemistry; D005456:Fluorescent Dyes; D007452:Iodates / Q000032:analysis*; D007455:Iodine / Q000032:analysis; D057230:Limit of Detection; D045663:Quantum Dots; D017673:Sodium Chloride, Dietary / Q000032:analysis* / Q000592:standards; D013050:Spectrometry, Fluorescence / Q000379:methods; D013440:Sulfides / Q000737:chemistry
D019187:Cadmium Compounds; D005456:Fluorescent Dyes; D007452:Iodates; D017673:Sodium Chloride, Dietary; D013440:Sulfides; C034024:iodized salt; C034939:cadmium sulfide; D007455:Iodine; D002266:Carboxymethylcellulose Sodium