4-tert-Butylbenzo-15-crown-5를 이용한 납 이온선택성 고체 접촉 전극에 관한 연구
Studies on Lead Ion Selective Solid Contact Electrodes based on 4-tert-butylbenzo-15-crown-5
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Abstract
The lead (II) ion selective solid contact electrode (SCE) was prepared using pyrrole or aniline as conducting polymer layer. 4-tert-Butylbenzo-15-crown-5 was used as an ionophore in PVC cocktail solutions. Solid contact electrode based on the conducting polymer of polypyrrole doped with LiCl exhibited linear Nernstianresponse in the range of 1.0×10-5~1.0×10-1 M with a slope of 29.31±0.20 per decade (R=0.999) and response time within 20s over the entire concentration range. The solid contact electrode based on the conducting polymer of polyaniline doped with HClO4 exhibited linear Nernstian-response in the range of 1.0×10-5~1.0×10-1M with a slope of 29.08±0.20 per decade (R=0.999) and response time within 20s over the entire concentration range. The working pH range of the Pb2+ selective SCE was pH 3.5~8.0 and it showed good selectivity for Pb(II) ions over other metal cations such as Mg2+, Mn2+, Co2+, Zn2+, Ni2+, Ca2+, Cd2+, Cu2+, Ag+, Na+ and K+. The lead (II) ion selective solid contact electrode (SCE) based on 4-tert-butylbenzo-15-crown-5 was successfully used as an indicator electrode in potentiometric titration of lead ions with K2CrO4. This electrode showed shorter response time and better stability results than the coated wire electrode.
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