A sensltlve and simple spectrophotometrx method for the determmatlon of traces of Iron usmg a poldvmyl chloride) (PVC) membrane contaming 4,7-dlphenyl-l,lO-phenanthrolme (bathophenanthrohne) and o-mtrophenyl octyl ether (o-NPOE) was developed To a 5-ml water sample contammg non, 0 5 ml of 6 5 x lo-* M hydroxylammomum sulphate, 13 x lo-* M potassium Iodide, and acetic acid-sodium acetate buffer solutlon (pH 5 0) were added A sheet of PVC membrane conslstmg of 10 wt % bathophenanthrohne and 64 8 wt % o-NPOE was then placed m the sample solutlon and stlrred urlth a magnetic stirrer at 60Β°C After stlrrmg for a fixed tune, the absorbance of the red membrane was measured at 538 nm usmg a spectrophotometer The Iron concentration m the sample solution was calculated usmg a cahbratlon graph The detectable concentration of Iron was m the range 6 80 x lo-'-4 29 X 10m5 M Seven repeated measurements with 2 15 X lo-' M iron under the same condltlons gave an average, relatwe standard deviation and repeatablhty for the absorbances of the membranes of 0 180, 4 3% and 0 0215, respectnrely Keyworak UV-Valble spectrophotometry, Bathophenanthrohne, Iron, Poly(vmyl chloride) membrane