A novel wire-type lead-selective electrode based on bis (1'-hydroxy-2'-acetonaphthone)-2,2'-diiminodiethylamine.
The preparation of a lead-selective electrode based on bis(1'-hydroxy-2'-acetonaphthone)-2,2'-diiminodiethylamine (L) as sensing material is reported. The plasticized PVC membrane containing 30% PVC, 67% ortho-nitrophenyloctylether (NPOE) and 3% ionophore L was directly coated on a graphite rod. This electrode exhibits a nearly Nernstian slope of 27.8+/-0.2 mV decade(-1) over a concentration range 10(-6)-10(-2) M with a detection limit of 4.0 x 10(-7) M. The response time of the electrode was found to be <20 s. The potential of the sensor was independent on pH variations in the range 5-7. The selectivity of the electrode towards lead ions over Na+, K+, Ag+, Ca2+, Sr2+, Fe2+, Co2+, Ni2+, Cu2+, Zn2+, Cd2+, La3+, Sm3+ and Er3+ ions was investigated. The prepared electrode was successfully used as an indicator for titration of a lead solution with a standard solution of EDTA. The applicability of the sensor for Pb2+ measurement in various synthetic and real samples has been also demonstrated.
Pilehvari
Zahra
Z
Department of Chemistry, Faculty of Science, University of Zanjan, P.O. Box 45195-313, Zanjan, Iran.
Yaftian
Mohammad Reza
MR
Rayati
Saeed
S
Parinejad
Massoumeh
M
D004492:Edetic Acid / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007097:Imines / Q000138:chemical synthesis / Q000737:chemistry*; D007202:Indicators and Reagents / Q000138:chemical synthesis / Q000737:chemistry; D017736:Ion-Selective Electrodes; D007854:Lead / Q000032:analysis / Q000737:chemistry*; D008024:Ligands; D009284:Naphthols / Q000138:chemical synthesis / Q000737:chemistry*; D011199:Potentiometry; D012545:Schiff Bases / Q000138:chemical synthesis / Q000737:chemistry
D007097:Imines; D007202:Indicators and Reagents; D008024:Ligands; D009284:Naphthols; D012545:Schiff Bases; C524878:bis(1'-hydroxy-2'-acetonaphthone)-2,2'-diiminodiethylamine; D007854:Lead; D004492:Edetic Acid