Abstract
The bis(2-carbaldehyde-N-methylfuranthiosemicarbazonato)nickel(II) complex present in a polymeric membrane electrode (PME) and a coated graphite electrode (CGE) exhibited Nernstian slope (−58.80 mV/decade) for chloride ions with a lower detection limit of 3.98 × 10−6 M (CGE). The CGE has a wide functional pH range (1.65–5.65) and fast response time (<20 s). The proposed electrodes are highly selective for chloride ions over different secondary ions, particularly toward potential interferents Br−, I−, and SCN− ions (log = − 2.00, log
= − 0.50, and log
= −1.30). The electrodes have been used as indicator electrodes in potentiometric titrations and for the estimation of chloride content in pharmaceutical samples.
Durgesh Nandni is thankful for the financial assistance from the University Grants Commission–Special Assistance Program (SAP), New Delhi, India. The authors thank Poonam Kumari for providing a sample of bis(furan-2-carbaldehyde-N-methylthiosemicarbazonato) nickel(II) complex.
Notes
a DOA: dioctyladipate.
b DOS: bis(2-ethylhexyl)sebacate.
c NPOE: o-nitrophenyloctyl ether.
d [bmim]PF6: n-butyl-3-methyl-immidazolium hexafluorophosphate.