Abstract
2-Hydroxy-5-methylpropiophenone oxime (HMP) forms two complexes with ferric iron, the formation of which is pH dependent. Blue colored complex is formed at lower pH values. This complex cannot be extracted into water-immiscible organic solvents. Another complex, brown-red in color, is formed at higher pH values which is extracted into organic solvents. The molar composition of two complexes has been ascertained by using logarithmic and Asmus methods. In the case of blue chelate, the composition is 1:1 (Fe 3+: oxime) and the composition of brown-red extracted complex is 1:3. The two complexes adhere to Beer's law over a fairly wide range of iron concentration and the sensitivity in terms of Sandell's definition has been calculated. Effect of some foreign ions has been investigated and tentative structures have been assigned to the two complexes.
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