Iron in boiler feed water for power plants (DHN method)

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The concentration of Fe(total) in boiler feed water is determined by adsorptive stripping voltammetry (AdSV) with 2,3-dihydroxy-naphthalene (DHN) as complexing agent. All reagents have to be added in the order as listed below. All reagents typically contain iron impurities, especially the DHN. Therefore a subtraction of the reagent blank is recommended.