A robust spin-coated optical sensing device for rapid determination of predominant metal ions in wastewater streams |
| |
Authors: | Donna Leamy Fiona Regan |
| |
Institution: | 1. Department of Applied Science , Limerick Institute of Technology , Moylish Park, Limerick, Ireland;2. School of Chemical Sciences , Dublin City University , Glasnevin, Dublin 9, Ireland |
| |
Abstract: | The potential of an optical sensing material for determination of metal ions in wastewater streams is presented. The initial results in the development of a chromo-ionophore-based optical sensor for metal ions are detailed. An azo dye species, 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (BrPADAP), together with an ionophore and plasticiser was immobilised in a film of poly(vinyl chloride) (PVC). Initial investigations using the dye-impregnated sensing film showed a reproducible and reversible response to Pb(II) ions in aqueous solution. The response of this sensing film to Pb(II) at pH 6 was found to be linear in the 0.1-10 mg/L range, with a %RSD of 1.55%. The film can be regenerated by immersion in a low-pH buffer solution. The authors demonstrate how this method shows potential for analysis using once-off sensing probes. The sensing film response for Pb(II) occurs within 30 s. |
| |
Keywords: | Uv-Visible Spectroscopy Metal Ion Sensor Chromophore Ionophore Pb(II) |
|
|