title: Bismuth (III) PVC membrane ion selective electrodes based on two compounds: acylhydrazone and thiosemicarbazone with 1,3,4-thiadiazole.
abstract: Two Bi(3+) selective electrodes based on L1 and L2 incorporated into a polyvinylchloride (PVC) membrane have been developed. The ionophores L1 and L2 are 2-(5-amino-1,3,4-thiadiazol-2-ylthio)-N'-benzylidene acetohydrazone and 1-(2-(5-amino-1,3,4-thiadiazol-2-ylthio) acetyl)-4-benzoylthiosemicarbazone, respectively. These electrodes are composed of dioctylphtalate (DOP) as a plasticizer and sodium tetraphenylborate (NaTPB) as the lipophilic additive. The best performance was obtained with the membrane compositions of L1 (0.30): PVC (33.22): DOP (66.36): NaTPB (0.12) (%, w/w) and L2 (1.00): PVC (33.00): DOP (65.91): NaTPB (0.09) (%, w/w). Two membrane electrodes show Nernstian response slopes towards Bi(3+) (20.2 and 19.7 mV/decade, respectively) over the concentration range of 10(-7)-10(-3) and 10(-7)-10(-2) M, respectively. The effects of the pH and the possible interfering cations were investigated. Both electrodes have a response time of about 10 s, and they can work in a certain concentration aqueous ethanol solution. The prepared electrodes were used as an indicator electrode in potentiometric titration of Bi(3+) ions with EDTA. The membrane sensors were also applied to the determination of Bi(3+) content in compound bismuth aluminate tablets.
authors.affiliation: College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, Henan 450001, PR China. yanzzn@zzu.edu.cn
authors.forename: Zhenning
authors.initials: Z
authors.lastname: Yan
authors.forename: Shuangqiang
authors.initials: S
authors.lastname: Wang
authors.forename: Haixia
authors.initials: H
authors.lastname: Wang
authors.forename: Shuangyan
authors.initials: S
authors.lastname: Wu
mesh_terms: D001729:Bismuth / Q000737:chemistry*; D006835:Hydrazones / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D017736:Ion-Selective Electrodes; D009682:Magnetic Resonance Spectroscopy; D011143:Polyvinyl Chloride / Q000737:chemistry*; D011199:Potentiometry; D012997:Solvents / Q000737:chemistry; D013055:Spectrophotometry, Infrared; D013830:Thiadiazoles / Q000737:chemistry*; D013882:Thiosemicarbazones / Q000737:chemistry*
chemical_list: D006835:Hydrazones; D012997:Solvents; D013830:Thiadiazoles; D013882:Thiosemicarbazones; C058949:1,3,4-thiadiazole; D011143:Polyvinyl Chloride; D001729:Bismuth