Author/Authors :
Hajiaghababaei، Leila نويسنده Department of Chemistry, Islamic Azad University, Shahre Rey Branch, Tehran, Iran , , Kazemi، Sara نويسنده Department of Chemistry, Islamic Azad University, Shahre Rey Branch, Tehran, Iran , , Badiei، Alireza نويسنده , , Zarabadi-Poor، Pezhman نويسنده School of Chemistry, College of Science, University of Tehran, Tehran, Iran , , Ganjali، Mohammad Reza نويسنده , , Mohammadi Ziarani، Ghodsi نويسنده ,
Abstract :
A PVC membrane electrode to determination of lead ions based on hydroxymethyl
-modified SBA-15 nanoporous silica as a carrier was prepared. The electrode exhibits a
Nernstian response for Pb2+ over a concentration range (1.0?10-1 to 1.0?10-4 mol L-1) with a
slope of 28.9±0.2 mV per decade. The limit of detection of the sensor is 5.5?10-5 mol L-1.
The sensor has a relatively fast response time (?10s) and a useful working pH range of 3.5–
8.0. Interference of some divalent cations was also evaluated. It was used as an indicator
electrode in potentiometric titration of Pb2+ with EDTA and in direct determination of lead
ion in wastewater and pepper samples. The results indicate that this electrode is sensitive for
determination of Pb2+.
