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This paper describes the need for detection of iron, preparation method of colorimetric material and response studies for detection of iron in contaminated water. Iron is a membrane foulant, and high concentration of it produces membrane fouling. Membrane fouling decreases the flux rate and efficiency of salt rejection and makes the membrane more susceptible to oxidation damage. Therefore, iron detection is essential in feed water before passing through RO membrane. Under this objective, a material was prepared through reaction of 1,10-phenanthroline with ascorbic acid and trisodium citrate (weight ratio 1:1:2). The prepared material shows significant response towards iron, and it is observed through naked eye. A yellow colour to change into orange red colour was observed within 5 min when material was exposed to Fe(II) ions at 300 µg/L as per IS 10500. UV-visible spectra of 1,10-phenanthroline-Fe complex show absorbance at wavelength 510 nm with iron without interference of other metal ions, viz. Cd(II), Co(II), Ni(II), Hg(II), Zn(II), Pb(II) and high TDS water.

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