Preparation and Characterization of Lanthanum (III) Selective Electrode Based on 1,10-Diaza-4,7,13,16-Tetraoxacyclooctadecane-N,N'-Diacetic Acid as an Ionophore

Suyanta Suyanta (Department of Chemistry Yogyakarta State University)
Susanto I.R (Department of Chemistry Bandung Institute of Technology)
Buchari Buchari (Department of Chemistry Bandung Institute of Technology)
Indra Noviandri (Department of Chemistry Bandung Institute of Technology)

JPMS (Jurnal Pendidikan Matematika dan Sains)
No 1 (2006): Jurnal Pendidikan Matematika dan Sains Tahun XI

The preparation and characterization of lanthanum (III) ion selective electrode based on the 1,10-diaza-4,7,13,16-tetraoxacyclooctadecane-N,N'-diacetic acid as ionophore was studied. The electrode was prepared with an inner solution system in a membrane composition that contained active DACDA ionophore, the anionic side of KTCPB, the plasticizer of NPOE and a PVC matrix support. The good response was obtained with a slope of 19.53 +- 1.62 mV/decade and a good correlation between potential and lanthanum (III) concentration. Electrode could response with a detection limit of 3.92x10^-6 M and range measurement between 10^-5 M to 10^-1M. Electrode is steady at pH 4-9 and the best condition of inner solution concentration at 10^-3 M. Response time was 27.1 seconds and their life time was 50 day.Kata kunci: lanthanum ion-selective-electrode, PVC membrane, 1,10-diaza-4,7,13,16-tetraoxacyclooctadecane-N,N'-diacetic acid