Journal
MATERIALS SCIENCE & ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS
Volume 62, Issue -, Pages 18-27Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.msec.2015.12.065
Keywords
Ni(II) complex; PVC membrane; SCN- selective electrode; Potentiometery
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The PVC based-ion selective electrode viz., bis nitrato[4-hydroxyacetophenone semicarbazone] nickel(II) as an ionophore was prepared for the determination of thiocyanate ion. The ionophore was characterized by FT-IR, UV-vis, XRD, magnetic moment and elemental analysis (CHN). On the basis of spectral studies an octahedral geometry has been assigned. The best performance was obtained with a membrane composition of 31% PVC, 63% 2-nitrophenyl octylether, 4.0% ionophore and 2.0% trioctylmethyl ammonium chloride. The electrode exhibited an excellent Nernstian response to SCN- ion ranging from 1.0 x 10(-7) to 1.0 x 10(-1) M with a detection limit of 8.6 x 10(-8) M and a slope of -59.4 +/- 0.2 mV/decade over a wide pH range (1.8-10.7) with a fast response time (6 s) at 25 degrees C. The proposed electrode showed high selectivity for thiocyanate ion over a number of common inorganic and organic anions. It was successfully applied to direct determination of thiocyanate in biological (urine and saliva) samples in order to distinguish between smokers and non-smokers, environmental samples and as an indicator electrode for titration of thiocyanate ions with AgNO3 solution. (C) 2016 Elsevier B.V. All rights reserved.
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