The composition of a monochloroacetate (MCA) sensitive membrane based on a new photocurable polymer is presented. The interest on measuring this parameter is based on its use in industrial processes for surfactants fabrication. The new polymer proposed, based on an aliphatic urethane diacrylate oligomer, has been chosen as membrane matrix due to its easy deposition procedure compared with PVC membranes. The deposition of the membrane and its photopolymerization under UV light is achieved in a few seconds. The membrane composition has been optimized in order to attain good mechanical properties and optimal sensor response by adjusting optimal ratio of monomer, cross-linker, ionophore and plasticizer. The MCA sensitive membrane has been tested using a potentiometric transducer based on an all-solid-state design. The resulting sensors show a sensitivity of 55mV per decade in a linear response range between 10-4and 10-1M MCA. The response time (t(95%)) is 5s and its lifetime under continuous operation is 90 days. Interference of usual ions is much lower than for PVC membranes, showing and improvement specially considering its future application in process monitoring. Copyright (C) 1999 Elsevier Science B.V.
|Journal||Analytica Chimica Acta|
|Publication status||Published - 9 Apr 1999|
- All solid-state sensor
- Ionic sensor
- MCA determination
- Photopolymerizable membrane