SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY, cilt.72, sa.4, ss.880-883, 2009 (SCI-Expanded)
A new optical sensor for sensing of Pb2+ in immobilized medium (PVC film) and ethanol medium was developed by using 5,10,15,20-tetra-(3-bromo-4-hydroxyphenyl)porphyrin (TBHPP) synthesized. The sensor-based TBHPP showed a linear response towards Pb2+ in concentration range from 5 x 10(-6) to 4 x 10(-4) mol L-1 in PVC film and 5 x 10(-6) to 3 x 10(-4) mol L-1 in ethanol medium, with a working pH 7. The detection limit was 2 x 10(-8) and 4 x 10(-8) mol L-1 for Pb2+ in PVC film and ethanol medium respectively. The response time of Pb2+ was found as 4 min for PVC film and 2 min for ethanol medium. The sensor developed in two different mediums was used for lead determination in standard soil sample with satisfactory results. (C) 2008 Elsevier B.V. All rights reserved.