An Eu(III) sensor based on N,N-diethyl-N-(4-hydroxy-6-methylpyridin-2-yl)guanidine.
A highly selective poly(vinyl chloride)-based membrane sensor produced by using N,N-diethyl-N-(4-hydroxy-6-methylpyridin-2-yl)guanidine (GD) as active material is described. The electrode displays Nernstian behavior over the concentration range 7.0 x 10(-5) - 1.0 x 10(-1) M. The detection limit of the electrode is 5.0 x 10(-5) M. The best performance was obtained with the membrane containing 30% PVC, 55% benzyl acetate, 5% GD and 10% oleic acid. The response of the sensor is pH-independent in the range of 3.0 - 7.0. The sensor possesses satisfactory reproducibility, fast response time (< 20 s), and specially excellent discriminating ability for Eu(III) ion with respect to the alkali, alkaline earth, transition and heavy metal ions. The membrane sensor was used as an indicator electrode in potentiometric titration of Eu(III) ion with EDTA. It was also applied in determination of fluoride ions in mouth wash preparations.
Ganjali
Mohammad Reza
MR
Department of Chemistry, Tehran University, Tehran, Iran. Ganjali@khayama.ut.ac.ir
Rahimi
Mehdi
M
Maddah
Bozorgmehr
B
Moghimi
Abolghasem
A
Borhany
Shahin
S
D005063:Europium / Q000032:analysis / Q000737:chemistry*; D019791:Guanidine / Q000031:analogs & derivatives* / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D017736:Ion-Selective Electrodes / Q000592:standards*; D008567:Membranes, Artificial; D015394:Molecular Structure; D011143:Polyvinyl Chloride / Q000737:chemistry*; D012680:Sensitivity and Specificity; D013997:Time Factors
D008567:Membranes, Artificial; C493403:N,N-diethyl-N-(4-hydroxy-6-methylpyridin-2-yl)guanidine; D005063:Europium; D011143:Polyvinyl Chloride; D019791:Guanidine