Voltammetric Determination of Vanadium, by Using 1,10-Phenanthroline as a Complexing Agent

Abstract

A new voltammetric method is described for the determination of vanadium. Vanadium forms a complex with 1,10-phenanthroline, giving one reduction peak in acetate buffer, pH=5.7, at –0.488 V. The response of the system was found to be linear in the range 4–250 μg/1. The limit of detection is 1.6 μg/1. The RSD at concentration level of 10 μg/1 is 4.7%. The effect of various potential interferences was also studied. Copper, lead, and cadmium interfere with the determination, which is overcome by addition of sodium sulphide.

The method was applied to the determination of vanadium in spiked seawater, as well as in spiked alloy sample.

Key Words:

• Voltammetric determination
• vanadium (V)
• 1,10-phenanthroline
• seawater
• alloy