Spectroelectrochemical Sensor for Pertechnetate Applicable to Hanford and Other DOE Sites Page: 4 of 5
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Detection of pertechnetate ion (TcO4-) at the Hanford Site requires detection limits as low as 10-10 M.
Thus, we are pursuing luminescence as a mode of detection to achieve the detection limit required. Due to
restriction of the use of radioactive TcO4- to PNNL, at UC we have investigated the luminescence of
Ru(bpy)32+ cation as a model analyte coupled with its selective preconcentration into thin Nafion films. In
these studies, we have already demonstrated extremely low limits of detection. We are able to measure
Ru(bpy)32+ concentrations as low as 1x10-13 M and the calculated limit of detection from our data
indicated a value of 5x10-14 M. Furthermore, we have recently discovered that high sensitivity can be
coupled with ultra-thin sensor films as selective preconcentration media. Currently we are able to make
films as thin as ca. 6-7 nm which is a thickness very close to the average surface roughness of the ITO
coating on the optical substrate. Besides providing much faster response times, ultra-thin films are superior
in surface adhesion and mechanical properties. Due to its small volume, the sensor designed for
luminescence measurements requires a flow of a very small amount of liquid sample in order to
preconcentrate a measurable amount of analyte. We continue to improve this instrument.
Task 3: Demonstration of sensor performance on TcO4- standards and samples from the vadose zone
and subsurface water at Hanford Site
We have evaluated new pertechnetate preconcentration materials at PNNL (see Task 1).
DELIVERABLES: Spectroelectrochemical Sensing Based on Multimode Selectivity Simultaneously
Achievable in a Single Device. 11. Design and Evaluation of a Small Portable Sensor for the Determination
of Ferrocyanide in Hanford Waste Samples, M.L. Stegemiller, W.R. Heineman, C J. Seliskar, T.H.
Ridgway, S.A. Bryan, T. Hubler, R.L. Sell, Environ. Sci. & Technol., 37, 123-130, 2003.
In Situ Measurements of Sensor Film Dynamics by Spectroscopic Ellipsometry. Demonstration of Back-
side Measurements and the Etching of Indium Tin Oxide, I. Zudans, C.J. Seliskar, W.R. Heineman, Thin
Solid Films, 426, 238-245, 2003.
Spectroelectrochemical Sensing Based on Multimode Selectivity Simultaneously Achievable in a Single
Device: An Overview, W.R. Heineman, C.J. Seliskar, J.N. Richardson, Austral J Chem, 56, 93-102, 2003.
Spectroelectrochemical Sensing: Planar Waveguides, S. E. Ross, Y. Shi, C.J. Seliskar, W.R. Heineman,
Electrochim Acta, 48, 3313-3323, 2003.
Spectroelectrochemical Sensing Based on Attenuated Total Internal Reflectance Stripping Voltammetry. 1.
Determination of Lead and Cadmium, T. Shtoyko, A.T. Maghasi, J.N. Richardson, C.J. Seliskar, W.R.
Heineman, Anal Chem, 75, 4585-4590, 2003.
Spectroelectrochemical Sensing Based on Multimode Selectivity Simultaneously Achievable in a Single
Device. 15. Development of Portable Spectroelectrochemical Instrumentation, D.J. Monk, T.H. Ridgway,
C.J. Seliskar, W.R. Heineman, Electroanal, 15, 1198-1203, 2003.
Spectroelectrochemical Sensing Based on Multimode Selectivity Simultaneously Achievable in a Single
Device. 16. Sensing by Fluorescence, N. Kaval, C.J. Seliskar, W.R. Heineman, Anal Chem, 75, 6334-6340,
2003.
Development and Application of Novel Thin-Film Spectroelectrochemical Sensors Possessing Three
Modes of Selectivity, W.R. Heineman, C.J. Seliskar, J.N. Richardson, Russian J Electrochem, 39, 884-893,
2003.
Electrochemical and Optical Evaluation of Noble Metal- and Carbon ITO Hybrid Optically Transparent
Electrodes, I. Zudans, J.R. Paddock, H. Kuramitz, A.T. Maghasi, C.M. Wansapura, S.D. Conklin, N. Kaval,
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Heineman, William R. Spectroelectrochemical Sensor for Pertechnetate Applicable to Hanford and Other DOE Sites, report, December 1, 2004; United States. (https://digital.library.unt.edu/ark:/67531/metadc778636/m1/4/: accessed March 28, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.