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Citation: SU Zhonghua, WANG Yajing, ZHAO Huan, HU Yamei, TANG Chunran, LI Xiafei, LI Jin, ZENG Yunlong. Determination of Trace Copper(Ⅱ) Using CdS Quantum Dots as a Fluorescence Probe[J]. Chinese Journal of Applied Chemistry, ;2011, 28(7): 842-848. doi: 10.3724/SP.J.1095.2011.00546 shu

Determination of Trace Copper(Ⅱ) Using CdS Quantum Dots as a Fluorescence Probe

1.
Key Laboratory of Theoretical Chemistry and Molecular Simulation of Ministry of Education, Hunan Province College Key Laboratory of QSAR/QSPR, School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201

Corresponding author: ZENG Yunlong,
Received Date: 16 September 2010
Available Online: 25 December 2010
Fund Project: 国家自然科学基金(21075035) (21075035)国家"十一五"科技支撑计划项目(2008BAI63B04) (2008BAI63B04)湖南省高校创新平台开放基金(10K024) (10K024)湖南科技大学研究生创新基金(S090121) (S090121)湖南省自然科学基金(07JJ6027)资助项目 (07JJ6027)

A new protocol for the determination of copper was developed based on the fluorescence quenching of carboxymethyl cellulose(CMC) coated CdS quantum dots(QDs),which were synthesized in aqueous solution using environmental benign carboxymethyl cellulose as stabilizer.The method has a relatively high selectivity,and no obvious interference on the determination of copper from other coexisting metal ions is observed except Co²⁺ and Hg²⁺ ions.Some influencing factors,including the buffer system,pH of the solution,concentration of QDs,reacting time and the temperature of reaction have also been investigated to obtain the optimal conditions for copper determination.When the concentration of QDs was 2×10^-4 mol/L,the concentration of KH₂PO₄-Na₂HPO₄ is 0.033 mol/L at pH=5.6,the relative fluorescence intensity of QDs was linearly proportional to copper(Ⅱ) ion concentration in the range from 5×10^-8 to 2×10^-5 mol/L.The linear equation was F₀/F=1.0150+100791.6c,and the detection limit was 8×10^-9 mol/L.This method is simple and rapid.Compared with the methods reported using QDs as fluorescence probes,this method has a higher selectivity and a wider linear range.The proposed method has been applied to the determination of trace copper in water and human hair with satisfactory results.
- CdS quantum dots,
- fluorescence quenching,
- determination,
- copper ion,
- water,
- human hair
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