Electronic Theses and Dissertation

Telah dilakukan penelitian mengenai penentuan koefisien selektivitas (kij) elektroda selektif ion (esi) al3+ berbasis membran poliuretan termodifikasi graphene dan 1,10-fenantrolin telah dilakukan. hasil penelitian menunjukkan bahwa nilai faktor nernst rata-rata sebesar 18,3 mv/dekade dengan trayek pengukuran 10-10-10-4 m. selektivitas esi al3+ terhadap ion asing fe3+ > cr3+ > pb2+ > cd2+ > cu2+ > co2+ > mg2+ > li+ > k+ di uji dengan metode larutan terpisah dan metode larutan tercampur menunjukkan nilai lebih kecil dari 1. nilai kij dari ion asing yang diuji tidak mempengaruhi respon esi al3+. kata kunci : elektroda selektif ion, ion al3+, faktor nersnt, koefisien selektivitas.

Research on the determination of the selectivity coefficient (Kij) of Al3+ ion selective electrodes (ISE) based on graphene and 1,10-phenanthroline-modified polyurethane membranes had been performed. The results showed that the average Nernst value was 18.3 mV/decade with a dynamic range of the measurement of 10-10-10-4 M. The selectivity coefficients of Al3+ ISE toward foreign ions of Fe3+ > Cr3+ > Pb2+ > Cd2+ > Cu2+ > Co2+ > Mg2+> Li+ > K+ investigated using the separate and mixed solution methods shown below 1. The values indicated all of investigated foreign ions do not influence on the response of Al3+ ISE. Keywords: Ion Selective Electrode, Al3+ Ion, Nersnt Factor, Selectivity Coefficient.