Digital Derivative Spectrophotometric Determination of Micro Amounts of Iron with 1,10-Phenanthroline

Abstract

Abstract Digital first-order derivative spectrophotometry was applied to the determination of iron with 1,10-phenanthroline. Under the recommended conditions, a linear relationship was confirmed between the first-derivative value and the iron concentration. The present method gives accurate results for iron, ranging from 1.6×10−7 to 8×10−5 mol dm−3 (8.9 μg dm−3–4.5 mg dm−3). The relative standard deviations for the determination of 4.8×10−5, 4.8×10−6, and 4.8×10−7mol dm−3 of iron(III) were 0.37, 0.38, and 0.93%, respectively. The effects of 63 diverse ions were examined. The present method was applied to the determination of iron in practical samples, i.e., river water, waste water and sea water.