1,2-bis(N , N’-benzylthioureido)benzene을 ionophore로 이용한 수은 이온 선택성 고체 접촉 전극

Abstract

Mercury (II) ion selective poly(aniline) solid contact electrode based on 1,2-bis(N,N’-benzylthioureido)ben-zene ionophore as two sulfurs containing sensing material is successfully developed. The electrode exhibits good linear response of 29.8 mV / decade (at 20 ± 0.2oC, r 2=0.9954) within the concentration range of 1 × 10-2.0~1 × 10-6.0M Hg (II). The composition of this electrode was 2BTB 2.5 : polyvinylchloride 16.5 : 2-nitrophe-nyloctyl ether 30.5 : potassiumtetrakis(4-chlorophenyl)borate 2.0. The electrode shows good selectivity for mer-cury (II) ion in comparison with alkali, alkaline earth, transition and heavy metal ions. This electrode is suitable for use with aqueous solutions of pH 3.0~7.0 and their standard deviation in the measured emf differences was ± 1.21 mV at mercury nitrate sample solution of 1.0 × 10-2M and 1.0 × 10-3M, respectively. Their stabilization time was less than 72 s. and response time was less than 50 s.