Electronic Theses and Dissertation

Telah dilakukan penelitian mengenai pembuatan elektroda selektif ion Al3+ berbasis membran poliuretan dari minyak jarak termodifikasi 1,10-fenantrolin dan graphene. Hasil penelitian menunjukkan bahwa membran terbaik yang diperoleh dengan komposisi minyak jarak: toluen diisosianat: 1,10-fenantrolin: graphene: aseton yaitu 37,86: 18,839: 0,07: 0,001: 43,23 (%b/b) menggunakan komposisi larutan internal KCl : Al(NO3)3 yaitu 0,1: 0,1 (M) dengan nilai faktor Nernst rata-rata sebesar 20,13 ± 0,14 mV/dekade, trayek pengukuran 10-10-10-4 M dan koefisien korelasi (r) 0,9985 ± 0,0004. Nilai limit deteksi sebesar 7 x 10-10 M, waktu respon 120 detik, pH optimum 5-8 dan waktu hidup elektroda selama 38 hari. Selektivitas ESI Al3+ terhadap ion asing yaitu Ni2+ > Hg2+ > Li+ > Co2+ > Zn2+ > Ca2+ > K+ > Bi3+ > Cu2+ > Pb2+ relatif tidak mengganggu dengan nilai Kij

Research on the construction aluminum (III) ion selective electrode (ISE) based on polyurethane membrane from castor oil modified with 1,10-phenantrolin and graphene has been conducted. The results showed that the optimum membrane composition of castor oil: toluene diisocyanate: 1,10-phenanthroline: graphene: acetone is 37.86: 18.839: 0.07: 0.001: 43.23 (%w/w) using an internal solution composition of KCl : Al(NO3)3 is 0.1: 0.1 (M) with an average Nernstian factor of 20.13 ± 0,14 mV/decade. The ISE has a dynamic range of 10-10 to 10-4 M, correlation coefficient (r) 0.9985 ± 0,0004, detection limit of 7 x 10-10 M, and a response time of 120 seconds. The electrode showed a stable response at pH 5-8 and a lifetime is 38 days. Effect of foreign ions such as Ni2+ > Hg2+ > Li+ > Co2+ > Zn2+ > Ca2+ > K+ > Bi3+ > Cu2+ > Pb2+ showed Kij values