Abstract
This method is based on the catalytic effect of Fe3+ on the oxidation reaction between Acid Chrome Blue K and potassium bromate in sulfuric acid medium at 100deg;C, and in 0.08 mol/L NH4OH - 0.01 mol/L (NH4)2 SO4 supporting electrolyte, Acid Chrome Blue K exhibits a sensitive polarographic wave at -0.55V vs. SCE, and change of concentration is traced by a polarographic detection technique. The linear range of Fe3+ is 10–100ng/mL. This new catalytic method has been applied to the determination of iron in natural water and food with satisfactory results.
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