Application of a bismuth film electrode to the voltammetric determination of trace iron using a Fe(III)—TEA—BrO catalytic system

Bobrowski, A.; Nowak, K.; Zarębski, J.
August 2005
Analytical & Bioanalytical Chemistry;Aug2005, Vol. 382 Issue 7, p1691
Academic Journal
A sensitive catalytic voltammetric method for determining trace iron at a bismuth film electrode (BiFE) is described. The method is based on the cathodic reduction of the Fe(III)–triethanolamine (TEA) complex to Fe(II). It has been proved that the addition of KBrO3 causes rapid oxidation of Fe(II) and TEA, and therefore results in a large increase in the analytical signal from Fe(III) when TEA is placed in alkaline solution. When TEA was present in the solution, operating the BiFE under optimized conditions yielded a stable catalytic voltammetric response for iron, with high sensitivity (0.88 μA μM−1), good precision (RSD=3.9%) and a low detection limit (7.7×10−9 M), obtained without any preconcentration procedure. Possible interferences from the coexisting ions and surface-active substances were investigated. Finally, the method was applied with satisfactory results to the determination of iron in certified reference river water samples.


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