ANYL 204 |
| A spectroelectrochemical sensor for the radioactive ion pertechnetate is currently being developed by the Chemical Sensors Group in collaboration with the Pacific Northwest National Laboratory. A crucial part of the sensor is the thin polymer film which serves to selectively preconcentrate the analyte at the sensor's optically transparent electrode surface. A series of quaternized poly(4-vinylpyridine-co-styrene) films, QPVP-PS, is being developed with varying PS content and degrees of quaternization for evaluation with aqueous pertechnetate. QPVP films previously used in the sensor are similar to the ion exchange resin used to remove pertechnetate from aqueous waste. That resin is highly quaternized by cross-linking with divinylbenzene and contains hydrophobic phenyl groups which QPVP does not. A film based on a co-polymer of PVP and polystyrene, PS, would represent increased hydrophobicity, possibly improving the film's ability to preconcentrate the pertechnetate ion. PVP-PS co-polymers (50% PS and 10% PS) have been crosslinked and quaternized from 10% to 65% with methyl iodide. Films made from these new materials have been deposited on ITO-glass and evaluated for analyte uptake. Uptake data and related results will be presented. |
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General Papers
7:00 PM-9:00 PM, Sunday, 28 August 2005 Washington DC Convention Center -- Hall A, Poster
Sci-Mix
Division of Analytical Chemistry |