Spectrophotometric determination of Fe(III) via complexation with piroxicam in synthetic mixture and soil samples

Abstract

A simple and selective spectrophotometric method has been described for determination of Fe(III) in synthetic mixture and soil samples. Method is based on chelation of ferric ion with piroxicam to produce at RT a coloured metal complex, which absorbs maximally at 495 nm. Beer’s law is obeyed (conc., 2.79-25.13 mg ml^-1) with apparent molar absorptivity (5.88 × 10³ l mol^-1cm^-1) and Sandell’s sensitivity ( 0.019 mg/cm²/ 0.001 absorbance unit). Proposed method was successfully applied in determination of Fe(III) in synthetic mixture and soil samples.