ELEKTRODA SELEKTIF ION (ESI) TETRABORAT TIPE KAWAT TERLAPIS BERBASIS ZEOLIT

Abstract

Telah dibuat dan dikarakterisasi elektro selektif ion (ESI) tetraborat tipe kawat terlapis berbasis zeolit. Hasil penelitian menunjukkan komposisi optimum membran yaitu zeolit : PVC : karbon aktif : DOP (%berat) = 32,3 : 16,1 : 3,2 : 48,4, menghasilkan sifat Nernstian dengan harga faktor Nernst sebesar 29,30 ± 0,28 mV/dekade konsentrasi pada kisaran konsentrasi linier 1x10-5 - 1x10-1M, batas deteksi 3,24x10-6 M (0,619 ppm tetraborat), waktu respon 50 detik, dan memiliki usia pemakaian selama 64 hari. ESI tetraborat bekerja baik pada kisaran pH larutan 7-10 dan temperatur 20-60 0C.

A plasticized PVC (polyvinyl chloride) membrane based coated wire tetraborate ion selective electrode has been developed by using zeolite. The results showed the optimum composition of the membrane was zeolite : PVC : activated carbon : DOP 32,3 : 16,1 : 3,2 : 48,4 (%weight). The electrode showed Nernstian response, Nernst factor 29.30 ± 0.28 mV/decade of concentration, with improved linear range of 1x10-5 - 1x10-1 M, with a comparatively lower detection limit of 3.24x10-6 M (0.619 ppm tetraborat), giving a relatively fast respons of 30 second and reasonable reproducibility. ISE’s performance worked well in pH range of 7-10 and temperature range of 20-60 0C. The lifetime of the electrode was found to be 64 days.