چكيده به لاتين
In this study for the first time carbon paste electrode (CPE) was modified with ion imprinted polymer (IIP) for uranyl detection by potentiometriy technique. The nanosized UO22+-imprinted polymer was prepared by precipitation polymerization technique. This polymer was mixed with carbon paste and its response to uranyl ions (1 mM) was obtained at various pHs (1 – 13). The results showed that at a wide pH range (2 – 8) the electrode potential is almost constant. The effect of modifier amount in the paste composition was studied (5, 10, 15, 20 and 20%) at various concentrations of uranyl and at pH 6, which the best result was for 15%. At the optimum conditions the linear range was between 2.5×10-7 to 7.8×10-3 mol.L-1 with an almost Nernstian slope (33 mV.dec-1). The detection limit for uranyl was 2.5×10-8 mol.L-1. The repeatability and reproducibility were examined, which were acceptable. The interfering effect of some important and common cathions were investigated, and finally the proposed electrode was successfully used for determination of uranyl in tap and river waters. The proposed sensor has some advantageous such as wide linear range, low detection limit, ease of modification and renewability of electrode surface.
