RESEARCH PAPER
Highly selective thiocyanate PVC membrane electrode based on Ni (II) complex of 2-acetyl thiophene thiosemicarbazone schiff base (NATS) as ionophore
CHANDRA MOHAN 1  
,  
Kusum Sharma 2
,  
 
 
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1
Chemistry, School of Basic & Applied Sciences, K. R.Mangalam University, India
2
Applied Science, Maharaja Agrasen Institute of Technology, India
3
Department of Chemistry, Zakir Husain College, India
CORRESPONDING AUTHOR
CHANDRA MOHAN   

Chemistry, School of Basic & Applied Sciences, K. R.Mangalam University, Sohna Road, 122103, Gurugram, India
Publish date: 2019-02-07
 
Eurasian J Anal Chem 2018;13(6):em
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ABSTRACT
Background:
A highly selective PVC-membrane electrode based on the Nickel (II) complex of 2–acetylthiophene thiosemicarbazone schiff base [Ni(L)2]Cl2 was fabricated and tested as a membrane sensor towards SCN− ions.

Material and methods:
2–acetylthiophene thiosemicarbazone ligand (L) was prepared with the help of 2-acetyl thiophene and thiosemicarbazide hydrochloride. Metal complex was synthesized based on this ligand with NiCl2. The ligand and complex were characterized by the FT-IR, Elemental analysis, 1H-NMR and 13C-NMR spectral studies.

Results:
The proposed potentiometric sensor showed a stable potential response to thiocyanate ion with Nernstian slope of -59.2 ± 0.1 mV decade-1 over a linear concentration range of 1.0 x 10-6 to 1.0 x 10-1 M. The response of the developed electrode was independent of pH in the range of 2.5–10.0. The sensor worked well with a short response time of ~10 s and a lifetime of about 6 weeks.

Conclusions:
The proposed sensor finds application as an indicator electrode in the potentiometric titration of SCN− with Ag+ ions and to determine the concentration of thiocyanate ion in water samples. The proposed electrochemical sensor has been shown to have high degree of selectivity and relatively short response time.

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