Functional magnetic nanoshells integrated nanosensor for trace analysis of environmental uranium contamination |
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Authors: | Reshmi Banerjee Leonel Lagos Melodie Naja Keith H Pannell |
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Affiliation: | a Nanobioengineering/Bioelectronics Lab, Department of Biomedical Engineering, Florida International University, 10555W. Flagler Street, Miami, FL 33174, USA b Applied Research Center, Florida International University, 10555W. Flagler Street, Miami, FL 33174, USA c Department of Chemistry, University of Texas at El Paso, TX, USA d Everglades Foundation, 18001 Old Cutler Road, Palmetto Bay, FL 33157, USA e Dpto. Ciencias de los Materiales, Universidad Simón Bolívar, Valle de Sartenejas, Baruta 1080, Edo. Miranda, Caracas, Venezuela |
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Abstract: | Transuranic radionuclides such as uranium tend to be a pervasive environmental contaminant. It is absorbed through the intestine or a lung, deposited in the tissues, predominantly kidney and bone, and is carcinogenic. A novel nanosensor system has been developed for voltammetric tracing of environmental uranium contamination.The sensor consists of an organophosphorous ligand, (t-butylphenyl)-N,N-di-(isobutyl) carbamoylmethylphosphineoxide (CMPO) functionalized superparamagnetic core-shell magnetic nanoparticles and magnet based electrodes. It exploits the natural affinity of uranium for phosphate molecules to fabricate a highly specific and reproducible sensor. The small dimension along with a dramatically increased contact surface has lead to a faster response and higher sensitivity. The system uses an external magnetic field gradient for preconcentration and removal of the analyte from the surrounding aqueous media. The redox properties of the analyte are exploited for enumeration of variables by electrochemical techniques such as square wave voltammetry. The detection limit of the system is observed to be in parts-per-billion (ppb) of the uranyl concentration. |
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Keywords: | Functional magnetic nanoparticles Nanoshells CMPO Nanosensors Uranium detection Trace analysis Environmental contamination Electrochemical sensor |
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