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J. Braz. Chem. Soc. vol.11 número1

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Figure 1. Schematic diagram of the Fe 2 O 3 -based graphite-epoxy tubular electrode used in the potentiometric measurement of pH in a flow injection system
Figure 4.  pH dependence of the operational potentials (at 25 o C) of Fe 2 O 3 -based graphite-epoxy tubular electrodes with different compositions.
Figure 7. Flow rate dependence of the operational potential (at 25 o C) of the Fe 2 O 3 -based graphite-epoxy tubular electrode (30%
Figure 8. Recorder output of  the pH sensitive Fe 2 O 3 -based graphite- graphite-epoxy tubular electrode corresponding to successive injections of buffer solution at pH 6.

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