Lanthanum(IlI) PVC membrane electrodes based on 1,3,5-trithiacyclohexane.
Novel plasticized polymeric membrane (PPME) and membrane-coated graphite (MCGE) electrodes based on 1,3,5-trithiacyclohexane for highly selective determination of La3+ ion have been developed. The electrodes exhibit Nernstian responses over very wide concentration ranges (8.0 x 10(-6)-5.0 x 10(-2) M for PPME and 4.0 x 10(-8)-1.0 x 10(-2) M for MCGE). The limit of detections were 5.0 x 10(-6) and 2.0 x 10(-8) M for PPME and MCGE, respectively. The electrodes possess a fast response time of approximately 10 s and can be used for at least 6 months without observing any deviation. The proposed electrodes revealed excellent selectivities for La3+ over a wide variety of alkali, alkaline earth, transition, and heavy metal ions and could be used in a pH range of 5.0-8.0. The practical utility of the electrodes has been demonstrated by their use as indicator electrodes in the potentiometric titration of La3+ ions with EDTA and in determination of F- in some mouthwash preparations.
Shamsipur
Mojtaba
M
Department of Chemistry, Razi University, Kermanshah, Iran. mshamsipur@yahoo.com
Yousefi
Mohammad
M
Hosseini
Morteza
M
Ganjali
Mohammad Reza
MR
D003510:Cyclohexanes / Q000737:chemistry*; D004566:Electrodes; D007811:Lanthanum / Q000032:analysis* / Q000737:chemistry; D008567:Membranes, Artificial; D011143:Polyvinyl Chloride / Q000737:chemistry*; D011199:Potentiometry
C469819:1,3,5-trithiacyclohexane; D003510:Cyclohexanes; D008567:Membranes, Artificial; D007811:Lanthanum; D011143:Polyvinyl Chloride