Portable Analyzer Based on Microfluidics/Nanoengineered Electrochemical Sensors for In-situ Characterization of Mixed Wastes

Technical Report · Tue Jun 01 00:00:00 EDT 2004

DOI:https://doi.org/10.2172/839337· OSTI ID:839337

Lin, Yuehe; Wang, Joseph

Required characterizations of the DOE's transuranic (TRU) and mixed wastes (MW) before disposing and treatment of the wastes are currently costly and have lengthy turnaround. Research toward developing faster and more sensitive characterization and analysis tools to reduce costs and accelerate throughputs is therefore desirable. This project is aimed at the development of electrochemical sensors, specific to toxic transition metals, uranium, and technetium, that can be integrated into the portable sensor systems. This system development will include fabrication and performance evaluation of electrodes as well as understanding of electrochemically active sites on the electrodes specifically designed for toxic metals, uranium and technetium detection. Subsequently, these advanced measurement units will be incorporated into a microfluidic prototype specifically designed and fabricated for field-deployable characterizations of such species. The electrochemical sensors being invest igated are based on a new class of nanoengineered sorbents, Self-Assembled Monolayer on Mesoporous Supports (SAMMS). SAMMS are highly efficient sorbents due to their interfacial chemistry that can be fine-tuned to selectively sequester a specific target species. Adsorptive stripping voltammetry (AdSV) will be performed on two classes of electrodes: the SAMMS modified carbon paste electrodes, and the SAMMS thin film immobilized on microelectrode arrays. Interfacial chemistry and electrochemistry of metal species on the surfaces of SAMMS-based electrodes will be studied. This fundamental knowledge is required for predicting how the sensors will perform in the real wastes which consist of many interferences/ligands and a spectrum of pH levels. The best electrode for each specific waste constituent will be integrated onto the portable microfluidic platform. Efforts will also be focused on testing the portable microfluidics/electrochemical sensor systems with the selected MW and T RU waste samples at the Hanford site. The outcome of this project will lead to the development of a portable analytical system for in-situ characterization of MW and TRU wastes. The technology will greatly reduce costs and accelerate throughputs for characterizations of MW and TRU wastes.

• Research Organization: Pacific Northwest National Laboratory, Richland, WA; New Mexico State University, Las Cruces, NM (US)
• Sponsoring Organization: USDOE Office of Science (SC) (US)
• OSTI ID: 839337
• Report Number(s): EMSP-90138-2004a; R&D Project: EMSP 90138; TRN: US0502545
• Resource Relation: Other Information: PBD: 1 Jun 2004
• Country of Publication: United States
• Language: English

Related Subjects

12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
54 ENVIRONMENTAL SCIENCES
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ALPHA-BEARING WASTES
CARBON
CHEMISTRY
DETECTION
ELECTROCHEMISTRY
ELECTRODES
EVALUATION
FABRICATION
PERFORMANCE
TARGETS
TECHNETIUM
TESTING
THIN FILMS
TRANSITION ELEMENTS
URANIUM
WASTES