Determination of iron in natural and drinking waters by stripping voltammetry

A thick-film graphite-containing electrode modified with calomel was proposed for determining iron(III) by stripping voltammetry. Of the organic reagents under study, pyrocatechol was found to be the most sensitive in determining iron(III). The detection limit for iron(III) was 3.6 × 10−10 M (0.02 µg/L) at a preconcentration time of 30 s. The analytical signal from iron(III) was a linear function of its concentration in the range from 0.05 to 5 µg/L. A procedure for determining total iron in drinking and natural water was developed and certified.