### Rapid Photoluminescence Quenching Based Detection of $Cu^{2+}$ in Aqueous Medium by CdS Quantum Dots Surface Passivated by ThioureaRapid Photoluminescence Quenching Based Detection of $Cu^{2+}$ in Aqueous Medium by CdS Quantum Dots Surface Passivated by Thiourea

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 Author Kumar, Ambika ♦ Dutta, R. K. Source J-STAGE Content type Text Publisher The Japan Society for Analytical Chemistry Language English
 Subject Keyword CdS quantum dots ♦ photoluminescence quenching ♦ Cu2+ ♦ Stern–Volmer equation ♦ limit of detection ♦ water analysis ♦ $Cu^{2+}$ Abstract Presented here is a simple yet rapid and efficient analytical method for visual as well as spectroscopic method for sensing of trace concentrations of $Cu^{2+}$ ions in aqueous medium by systematic photoluminescence quenching of a highly water soluble probe made of CdS quantum dots surface modified by thiourea. The salient features of this work describe rapid detection (2 min equilibration time) of $Cu^{2+}$ ions at wider linear concentration range (0.025 – 10 mg/L) corresponding to a sensitivity of $2.81(mg/L)^{−1}$ and limit of quantification of 47.3 μg/L, respectively, suitable for $Cu^{2+}$ sensing in drinking water and ground water. Further, the detection of $Cu^{2+}$ ion was free from most interfering cations and anions, except for minor interference from $Cr^{3+},$ $Hg^{2+}$ and $Pb^{2+}.$ The robustness of our probe for $Cu^{2+}$ sensing is demonstrated from efficient $Cu^{2+}$ spike recovery analysis in groundwater and river water samples. ISSN 09106340 Learning Resource Type Article Publisher Date 2017-05-10 e-ISSN 13482246 Journal Analytical Sciences(analsci) Volume Number 33 Issue Number 5 Page Count 7 Starting Page 565 Ending Page 571