Suyanta, Sunarto, Lis Permana Sari, Nur Indah Wardani, Illyas Md Isa
A novel carbon paste electrode modified with 3-methyl-2-hydrazinobenzothiazole (MBTH) was developed for the determination of La(III) by differential adsorptive stripping voltammetry. The best overall performance was shown by an electrode with a composition ratio of MBTH: graphite: paraffin at 30: 35: 35 (% w/w) respectively. The performance of the electrode was found in the pH range of 6.0-8.0 and the the scan rate of 50 mV/s at temperature 25±3 °C. The voltammetric response was linear in the concentration range of 1.0 pM - 70.0 pM La(III) with a limit of detection 1.0 pM. A life time of electrode more than 3 months was obtained. The modified electrode showed high selectivity, sensitivity, and good reproducibility. The developed method was also applied to determination of lanthanum ion in sand samples. © 2014 The Authors.
Deparment of Chemistry Education, Faculty of Mathematics and Natural Science, Yogyakarta State University, Indonesia; Nanotechnology Research Centre, Faculty of Science and Mathematics, Universiti Pendidikan Sultan Idris, Tanjong Malim, Perak, 35900, Malaysia
