Abstract
A solid of Fe2O3 based carbon-epoxy composite electrode was investigated for use as a potentiometric pH sensor. The electrode was constructed with a mixture of sulfated iron(III) oxide, carbon power and epoxy resin that was deposited directly onto a glass tube. The effect of composition (Fe2O3, carbon and epoxy resin) on the electrode response and its calibration curve (mV/pH) were investigated. The analytical behaviour of the electrode in acid-base titrations was compared with that of a glass electrode. A linear response from pH 1.7 to 12.2 with a slope of 39.7 ± 0.6 mV/pH (at 25 o C) was observed.
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