Development of a New Potentiometric Sensor based on home made Iodide ISE Enriched with ZnO Nanoparticles and its Application for Determination of Penicillamine

摘要

This paper describes the preparation and application of “home-made” iodide ISE enriched with ZnOnanoparticles. Iodide ISE membrane was made of AgI:Ag2S:PTFE = 1:1:2 and enriched with ZnOnanoparticles in ratio 1-5.0 wt.%. Prepared membranes were used for penicillamine (Pen)determination in acetic buffer (pH = 4-4.75) and in perchloric acid (pH = 1-2). Due to the low pricemethod, simplicity and relative speed, a possibility for Pen determination was found. Pendetermination showed better results in an acetic buffer, pH = 4 than in perchloric acid. All experimentsfor Pen measurements were done without pretreatment of pharmaceuticals. The determination is basedon the reaction between Pen with both Ag+ and Zn2+ from the electrode membrane. A newly describedmethod has linear response range for Pen 2.45×10?6-1×10?2 mol L?1 and a detection limit of 2.24×10?6mol L?1. The found concentrations of Pen are in a very good agreement with the declared ones with thestandard deviation of 2.70 %.