Testing of response of the ion-selective membranes made of FeS, Ag2S and PTFE on ferrous and ferric ions : bachelor thesis

Provedeno je testiranje odziva ion-selektivnih membrana na željezove(III) i željezove(II) katione pri pH=1, pH=1,5 i pH=4. U radu je opisana priprava otopina korištenih u radu te samo ispitivanje membrana u određenim otopinama. Izvedba samog eksperimenta odvijala se pomoću potenciometrijske metode koju odlikuju visoka isplativost i jednostavnost. Relativno dobre rezultate elektrode su pokazale na željezove(III) katione, dok za željezove(II) katione mjerenje nije bilo moguće provesti. Promjenom koncentracije i pH ispitivala se selektivnost same metode. Mjerenja su se provodila do trenutka kada razlika između dva mjerenja nije iznosila 1 mV.The response of ion-selective membranes to iron(III) and iron(II) cations at pH = 1, pH = 1.5 and pH = 4 was tested. This thesis describes the preparation of solutions used in the work and testing of membranes in certain solutions. The experiment itself was performed using the potentiometric method which is characterized as cost- effective and simplicity. Relatively good electrode results were shown for iron(III) cations, while for iron(II) cations the measurement could not be performed. The selectivity of the method itself was examined by changing the concentration and pH. Measurements were performed until the difference between the two measurements was 1mV