Abstract

ALVARADO-GAMEZ, Ana L.  and  CAMPOS-FERNANDEZ, Jorge. Development and Validation of a Voltammetry Method to Determine Traces of Iron in Water and other Matrixes. Port. Electrochim. Acta [online]. 2005, vol.23, n.1, pp.209-221. ISSN 0872-1904.

It was developed a sensitive analytical methodology to determine iron in water samples and other matrixes.  It was used a differential pulse cathodic stripping voltammetry technique and adsorptive preconcentration with KSCN as a ligand and NaNO₂ as a catalytic agent. The methodology has a linear range between 0.7 mg/L and 10.0 mg/L, a detection limit of 0.2 mg/L and a quantification limit of 0.7 mg/L.  The averaged sensitivity is 344 nA/(mg/L).  The accuracy has a recovery of 102% for 1.0 mg/L of iron with a variation coefficient of 4%. Also it was studied the linearity of the Fe-cathecol system, which has an average sensitivity of 4 nA/(mg/L), much lower than the one of the Fe-KSCN system, and a wider linear range  from 2.4 mg/L to 50.0 mg/, a detection limit of 0.7 mg/L and quantification limit of 2.4 mg/L, with a variation coefficient of 8% and recoveries near  100% at different concentration levels.

Keywords : adsorptive voltammetry; iron; thyocianate; nitrite; cathecol; trace analysis.

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