THE PREPARATION OF AN IODATE SELECTIVE ELECTRODE USING SILVER IODATE AS THE ACTIVE AGENT IN A CHITOSAN SUPPORT

Ani Mulyasuryani (Department of Chemistry, Faculty of Mathematics and Natural Sciences, Brawijaya University Jl. MT Haryono, Malang, Indonesia)
Qonitah Fardiyah (Department of Chemistry, Faculty of Mathematics and Natural Sciences, Brawijaya University Jl. MT Haryono, Malang, Indonesia)
Rizki Sugiri (Department of Chemistry, Faculty of Mathematics and Natural Sciences, Brawijaya University Jl. MT Haryono, Malang, Indonesia)

Indonesian Journal of Chemistry
Vol 7, No 3 (2007)

The iodate-selective electrode based on the principle of precipitation reaction could be made by coating the platinum wire with silver iodate (AgIO3). In this research was carried out optimization the iodate-selective electrode using chitosan membrane as an AgIO3 support. The AgIO3 were added in the 2 mL 1% chitosan solution, is 0.5 to 2.5 % (w/v). The thickness of the membrane used is 6 to 12 µm. The electrode cell potential is measured against Ag/AgCl electrode as a reference electrode. The optimum electrode performance was at 2.0 % of AgIO3 with thickness a membrane of 10 µm. The iodate-selective electrode has a Nernstian factor is 52.96 mV/decade and a response time of 10 seconds. The concentration range was determined from 10-3 M to 10-1 M and the detection limit is 1.12 x 10-5 M.