Abstract
A sensitive Spectrophotometric method for the determination of iron with tiron and a cationic surfactant, cetylpyridinium chloride, at pH 5.6 is reported. The complex is extracted into a chloroform-propan-2-ol (4∶1) mixture and shows maximum absorbance at 520 nm. Beer's law is obeyed in the range 1–14 μg/ml with an average molar absorptivity of 15800 l mol−1 cm−1. The molar ratio as determined by Job's method for Fe:tiron:CPC is 1∶4∶3. Interferences by various ions are examined. Zr, Ti and Mo interfere heavily. The method is applied for the determination of iron in Al-based and Cu-based alloys, using appropriate masking agents.
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