J Korean Soc Environ Anal Search


Journal of the Korean Society for Environmental Analysis 2012;15(3):149-154.
Lead ion Selective Poly(aniline) Solid Contact Electrode based on 5,5'-dithiobis(2-nitrobenzoic acid) Ionophore
5,5'-dithiobis(2-nitrobenzoic acid)를 Ionophore로 이용한 납 이온 선택성 Poly(aniline) 고체 접촉 전극
한원식1, 홍태기2, 이학주2, 이영훈2
Lead (II) ion selective poly(aniline) solid contact electrode based on 5,5'-dithiobis (2-nitrobenzoic acid) ionophore as a two sulfur atoms containing sensing material is successfully developed. The electrode exhibits good linear response of 25.6 mV/decade (at 20±0.2℃, r^2=0.9995) within the concentration range of 1.0×10^-1~1.0×10^-6 M Pb (II) solution. The composition of this electrode was ionophore : polyvinylchloride : 2-nitrophenyloctyl ether : potassium tetrakis(4-chlorophenyl)borate = 5.0 : 20.0 : 25.0 : 4.0. When we consider the results of using different lipotropic additive or mixed additive as like oleic acid or potassiumtetrakis(4-chlorophenyl)borate + oleic acid, poly(aniline) solid contact electrode based on 5,5'-dithiobis (2-nitrobenzoic acid)ionophore with only one potassiumtetrakis(4-chlorophenyl)borate lipotropic additive had the best result in response characteristics. The electrode shows good selectivity for lead (II) ion in comparison with alkali, alkaline earth, transition and heavy metal ions. This electrode is suitable for use with aqueous solutions of pH 3.00~6.80 and their standard deviation in the measured emf differences was±1.01 mV at lead nitrate sample solution of 1.0×10^-2 M and±1.75 mV at lead nitrate sample solution of 1.0×10^-4 M. Their stabilization time was less than 850 s and response time was less than 15 s. This electrode was successfully applied as an indicator electrode in potentio-metric titration of 60.0 ml of 5.0×10^-3 M Pb(NO_3)_2 solution against 1.0×10^-2 M chromate solution. The amount of lead ions in solutions can be accurately determined from the resulting titration curves.
Key Words: ISE, SCE, Sensor, Lead ion, Ionophore


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