Spectrofluorometric Determination of Mercury and Lead by Colloidal CdS Nanomaterial |
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| Authors: | Manmohan L. Satnami Sandeep K. Vaishanav Rekha Nagwanshi Kallol K. Ghosh |
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| Affiliation: | 1. School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur, C.G., Indiamanmohanchem@gmail.com;3. School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur, C.G., India;4. Department of Chemistry, Govt. Madhav Science P. G. College, Ujjain, M.P., India |
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| Abstract: | Heavy metal ions such as Hg and Pb are hazardous due to very high toxicity, mobility, and ability to accumulate through the food chain or atmosphere in the environment system. Therefore, ultrasensitive determination of mercury and lead is important to provide an evaluation index of ions in aqueous environment. This paper describes the investigation of surface modified quantum dots (QDs) as a sensing receptor for Hg2+ and Pb2+ ion detection by optical approach. Water-soluble L-cysteine-capped CdS QDs have been synthesized in aqueous medium. These functionalized nanoparticles were used as a fluorescence sensor for Hg2+ and Pb2+ ions, involved in the fluorescence quenching. The effect of foreign ions on the intensity of CdS QDs showed a low interference response toward other metal ions except Cu2+ and Fe2+ ions. The limit of detection (LOD) of this system is found to be 1.0 and 3.0 nM for Hg2+ and Pb2+ ions, respectively. |
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| Keywords: | Fluorescence quenching fluorescence sensor LOD surface modified QDs |
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