APPLICATION OF REDOX CYCLING ENHANCED CURRENT AT AN INTERDIGITATED ARRAY ELECTRODE FOR IRON-TRACE DETERMINATION IN ULTRAPURE SPECTRAL CARBON

Vertically arranged interdigitated array (IDA) electrodes with a conti nuous Pt-film basis and a 0.5 mu m thick insulation layer in the middl e separating the upper Pt-IDA electrodes (26 pairs of 400 mu m long fi ngers, 5 mu m wide with 5 mu m gaps) from the Pt-basis were applied fo r Fe trace analysis in ultrapure spectral carbon. The testing with spi ked samples as well as comparison of results with those obtained by in dependent graphite-furnace atomic absorption spectrometry (AAS) proved the reliability of the proposed sample preparation procedure and IDA signal generation in the range of Fe content 1 X 10(-5) to 1.5 X 10(-4 ) wt.%. The method can be considered as a less expensive alternative t o the AAS determination of Fe pollutants in this ultrapure material.