Abstract
Existing electrochemical methods for the determination of iron require long deposition times to determine low iron levels. Here a new method, based on catalytic cathodic stripping voltammetry, is described to determine subnanomolar levels of iron in seawater. The new method has a better baseline and is generally simplified, leading to a lower reagent blank and minimized sample handling compared to a previous catalytic method [1]. Optimized conditions include the addition of 20 μM 1-nitroso-2-naphthol (NN), 40 mM bromate, and 0.01 M HEPPS pH buffer, giving measurements in pH 8 seawater. The detection limit is 0.08 nM Fe after an adsorption time of 30 s; the detection limit is lowered by increasing the adsorption time. The method can also be used to determine the redox speciation of iron: FeIII is determined specifically by masking FeII with 2,2-bipyridyl (Bp). The concentration of FeII can then be calculated by difference from the total iron concentration.
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