Highly sensitive potentiometry for determination of chromium(VI) with carbon paste electrode

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Abstract
Trace-level Cr2O7 2– was determined in 2.0 mol dm–3 H2SO4(at 20 °C) with a carbon paste electrode (mixture of liquid paraffin and spectroscopically pure graphite powder, without ionophore) by using a potentiometric method with the linear range within 2.2 × 10–7–3.2 × 10–6 mol dm–3, response slope at 130–180 mV decade–1, and a detection limit at 3 × 10–8 mol dm–3. The respective interferences by 22 common ions were brought under study. An evaluation was made of the recovery of Cr2O7 2–, with an average value of 99.7%. This method is characterized by simplicity, convenience and speed.

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