Solvent-processible polymer membrane-based liquid junction-free reference electrode

被引:68
作者
Lee, HJ [1 ]
Hong, US [1 ]
Lee, DK [1 ]
Shin, JH [1 ]
Nam, H [1 ]
Cha, GS [1 ]
机构
[1] Kwangwoon Univ, Dept Chem, Nowon Ku, Seoul 139701, South Korea
关键词
D O I
10.1021/ac980265k
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
A new type of liquid junction;free reference electrode system is devised by employing solvent-processible polymer membranes. The membranes are formulated with either a one-component silicone rubber or an aromatic-type polyurethane as the matrixes. The optimized formulations incorporate both cation- and anion-exchange sites (i.e,, potassium tetrakis(p-chlorophenyl)borate and tridodecylmethylammonium chloride) and; in the case of silicone rubber, a plasticizer. The silicone rubber-based membrane, while possessing minimal response toward most ions, is found to display a near-Nernstian response to pH change. The aromatic polyurethane matrix formulation, however; is not sensitive to pH over a wide range (i.e,, pH 2-12) and is shown to exhibit only a small emf variation (within +/-2 mV) toward a wide variety of salts added even at very high concentrations (i,e,, up to 0.1 M). Potentiometric emf responses of ISEs (e.g,, Na+, K+, Ca2+, Cl-), whether paired with a polymer membrane-based reference electrode or with a conventional liquid junction-type reference electrode, are shown to be remarkably similar within the precision of the measurement setup. The feasibility of adapting the proposed reference electrode to the planar solid-state sensor format is also demonstrated.
引用
收藏
页码:3377 / 3383
页数:7
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