Wednesday, February 18, 2009

Highly Selective and Sensitized Spectrophotometric Determination of Iron (III) Following Potentiometric Study


Abstract

A simple, selective and sensitized spectrophotometric method for determination of trace amounts of Fe3+ ion in tap and waste water solutions has been described. The spectrophotometric determination of Fe3+ ion using Ferron in the presence of N,N-Dodecytrimethylammonium bromide (DTAB) has been carried out. The Beer's law is obeyed over the concentration range of 0.05-2.6 g mL-1 of Fe3+ ion with the relative standard deviation (RSD %) <0.2 % and the molar absorptivity of complexes in pH 3.5 is 3.8×103 L mol-1 cm-1.
Potentiometric pH titration has been used for prediction of protonation constants of ferron, and evaluating its stoichiometry and respective stability constant with Fe3+ ion. As it is obvious the most likely species of ferron alone and its complexes are LH (log=7.64), LH2 (logK=10.52), LH3 (logK=11.74) and ML2 (log= 23.68), ML3 (log= 23.68), ML3H (log= 23.68), ML3H2 (log= 23.68) and ML(OH)2 (log=23.68) respectively.
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