In recent years considerable progress in construction of potentiometric sensors has been achieved in the area of miniaturization, disposability and internal solution free construction. Among others polyacrylate based membranes are attractive materials to obtain ion-selective membranes of improved analytical parameters. Due to 1000 times lower diffusion coefficient compared to poly(vinyl chloride) counterparts, poly(acrylate) based membranes ¹ offer significant advantages when lowering the detection limit of a cation selective sensor is considered ^2,3,4; among anion selective electrodes, to the authors best knowledge so far, only I^--selective electrodes were reported ⁴. In this work we were looking at the effect of composition of n-butylacrylate – acrylonitrile based copolymer on the potentiometric responses of anion sensors. To study the effect of liphophilicity of primary ion chloride and salicylate sensors were chosen a as model. The effect of presence of ion-exchanger or above ion-exchanger + ionophore on achievable responses was highlighted. It was found that increasing amount of acrylonitrile in the copolymer is beneficial for improvement of analytical parameters of the chloride sensors. However, in the case of salicylate sensors, the membrane composition influence on sensor properties is less pronounced.

¹ L.Y. Heng, K. Toth , E.A.H. Hall, Talanta 2004, 63, 73.

² A.J. Michalska, Ch. Appaih – Kusi Ch, L.Y. Heng, S. Walkiewicz, E.A.H. Hall, Anal. Chem. 2004, 76, 2031.

³ J. Sutter, A. Radu, S. Peper, E. Bakker, E. Pretsch, Anal. Chim. Acta 2004, 523, 53.

⁴ K.Y. Chumbimuni-Torres, N. Rubinova, A. Radu, L.T. Kubota, E. Bakker, Anal. Chem, 2006, 78, 1318.

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