DETERMINATION OF IRON-ION UTILIZING POLY (P-VINYLBENZOYLACETONE) MODIFIED MICROELECTRODE

A porous micro-electrode with immobilized poly (p-vinylbenzoylacetone) (PVBA) was developed for measuring iron ion. A porous carbon material was packed into the tip of the platinum micro-electrode with a cavity at the top. The porous microelectrode was dipped in the coating tetra hydrofuran solution with PVBA and di-2-ethylhexyl phthalate and dried overnight at room temperature. Calibration curve for the measurement o f iron, the effects of preconcentration condition, scan rate, pH, and temperature, and lifetime of the PVBA modified micro-electrode were ex amined. Under optimal conditions, the response of the sensor was linea r in the concentration range of 0.01-1 mM for iron ion. (C) 1998 Elsev ier Science B.V. All rights reserved.