Droplet-based amperometric sensor for iodate in table salt using screen-printed carbon electrode
Dave Gabriel E Cadungog1, Jose H Bergantin2, Fortunato B Sevilla2
1The Graduate School, University of Santo Tomas, Manila 1015, Philippines; Department of Chemistry, College of Science, University of Santo Tomas, España Blvd, Manila 1008, Philippines; Department of Science and Technology (Philippines) - Philippine Nuclear Research Institute, Commonwealth Avenue, Diliman, Quezon City 1101, Philippines.
None:
The application of electrochemical methods for iodate determination was investigated using a bare screen-printed carbon electrode (SPCE). A rapid, precise, and accurate amperometric iodate sensing strategy was established with this SPCE. The method employs a low-pH acid solution as the solvent for table salt and requires only 60 μL of sample solution. Cyclic voltammetry confirmed the electrocatalytic reduction of iodate, yielding a sensitivity of -0.596 μA/(mg/L). Under optimized amperometric conditions, two linear ranges were obtained: 1-10 mg/L (LOD = 0.049 mg/L) and 10-250 mg/L (LOD = 0.21 mg/L). Analysis of real salt samples showed no significant difference compared with the reference method (p > 0.05). The use of a bare SPCE thus provides a low-cost, green, and practical platform for electrochemical determination of iodate in table salt, offering potential as the basis for an electrochemical rapid test kit (RTK).
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