Novel potentiometric membrane sensor based on 6-(4-nitrophenyl)-2-phenyl-4,4-dipropyl-3,5-diaza-bicyclo[3,1,0] hex-2-ene for detection of strontium (II) ions at trace levels.
A new PVC membrane strontium ion-selective electrode has been constructed using 6-(4-nitrophenyl)-2-phenyl-4,4-dipropyl-3,5-diaza-bicyclo[3,1,0] hex-2-ene (NPDBH) as a neutral ionophore. The electrode was prepared with 7% NPDBH (as ionophore), 57% acetophenone (as plasticizer), 30% PVC and 6% oleic acid (as lipophilic additive). The electrode responds to Sr2+ ion with a sensitivity of 28.2+/-0.5 mV/decade over the range 1.0 x 10(-6)-1.0 x 10(-1) mol L(-1) and in a pH range of 3.0-10.0. The limit of detection was 2.4 x 10(-7) mol L(-1). It has a response time of <20s and can be used for at least three months without any divergence in potentials. The proposed electrode shows good discrimination of Sr2+ ion from several cations. The effect of organic solvents on electrode response was examined. The results show that this electrode can be used in ethanol media up to 15% (v/v) concentration without interference. The isothermal temperature coefficient of this electrode amounted to 0.00019 V/ degrees C. The electrode was found to work well under laboratory conditions. It was successfully applied to the determination of strontium ions in human urine and bone digests.
Zanjanchi
M A
MA
Department of Chemistry, Faculty of Science, University of Guilan, P.O. Box 1914, Rasht, Iran. zanjanchi@guilan.ac.ir
Arvand
M
M
Islamnezhad
A
A
Mahmoodi
N O
NO
D000098:Acetophenones / Q000737:chemistry; D019086:Bridged Bicyclo Compounds, Heterocyclic / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D017736:Ion-Selective Electrodes; D007476:Ionophores / Q000737:chemistry*; D019301:Oleic Acid / Q000737:chemistry; D010968:Plasticizers / Q000737:chemistry; D011143:Polyvinyl Chloride / Q000737:chemistry; D011199:Potentiometry; D013324:Strontium / Q000032:analysis*; D013696:Temperature
C528538:6-(4-nitrophenyl)-2-phenyl-4,4-dipropyl-3,5-diazabicyclo(3.1.0)hex-2-ene; D000098:Acetophenones; D019086:Bridged Bicyclo Compounds, Heterocyclic; D007476:Ionophores; D010968:Plasticizers; D019301:Oleic Acid; D011143:Polyvinyl Chloride; C038699:acetophenone; D013324:Strontium