Research output: Contribution to journal › Journal article
|Journal publication date||2010|
|Journal||IOP Conference Series: Materials Science and Engineering|
|Number of pages||9|
|Conference||Actinides 2009, the 8th International Conference on Actinide Science held on 12–17 July 2009 in San Francisco|
|Period||12/07/09 → 17/03/12|
The requirement for on-line and in-situ monitoring of analytes in process and effluent streams and in ground waters has become increasingly more important in recent years. We therefore describe the development of the transduction element for a fully automated online instrument for the detection of caesium. The sensor layer for this instrument employs an Ion Selective Conductimetric Microsensor (ISCOM) as the detector. This is based upon a plasticized polymeric membrane incorporating a selective ionophore, overlaying two interdigitated microelectrode arrays. A direct relationship has been observed between the bulk conductance (as determined by the microelectrodes) of the ionophore loaded membrane and the concentration of the primary ions in solution.
Caesium selective ISCOMs were prepared using an ion selective membrane containing the commercially available ionophore Calix arene-hexaacetic acid hexaethyl ester, polyvinylchloride (PVC) and plasticiser Nitrophenylether (NPOE). The relative levels of membrane components have also been varied in order to further enhance the ISCOM response. We also present preliminary data concerning the caesium selectivity with respect to a range of possible interferents, including rubidium.