ScienceAsia 33 (2007): 455-460 |doi: 10.2306/scienceasia1513-1874.2007.33.455

4-Aminoantipyrine as a New Electrophilic Coupling Reagent for Spectrophotometric Determination of Iron(III) in Water, Industrial Effluent and Soil Samples

Subbanaika Manjula,^a Salman Khan^a and Akheel Ahmed Syed^b*

ABSTRACT:    A Novel, rapid, sensitive and selective spectrophotometric method, using 4-aminoantipyrine (AAP) as an electrophilic coupling reagent and iminodibenzyl (IDB) as a chromogen, is proposed for the determination of trace amounts of iron(III) in water, industrial effluent and soil samples. The method is based on the reduction of iron(III) by AAP, which subsequently couples with IDB in a mild hydrochloric acid medium to form a blue coloured product having λmax at 620 nm. The colour is stable up to 24 h and obeys Beer’s law in the concentration range of 0.2 - 4.8 µg ml^-1. The optimum reaction conditions and other important analytical parameters were established to enhance the sensitivity of the proposed method. The interference due to various non- target ions was also investigated. The proposed method was applied to the analysis of iron(III) in water, industrial effluent and soil samples. The performance of the proposed method was evaluated in terms of student’s t-test and variance ratio F-test that indicated the significance of the proposed method over reference spectrophotometric method.

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^a Department of Studies in Environmental Science, University of Mysore, Manasagangotri, Mysore 570 006, India.
^b Department of Studies in Chemistry, University of Mysore, Manasagangotri, Mysore 570 006, India.

* Corresponding author, E-mail: akheelahmed54@rediffmail.com

Received 16 Feb 2007, Accepted 22 Aug 2007