Analytical Sciences
Original Papers
Iodometric Amplification Method for the Determinations of Microgram Amounts of Manganese(II), Manganese(VII), Chromium(III) and Chromium(VI) in Aqueous Solution
Minghao ZHANGGuoping ZHANZhanguang CHEN
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Volume 14 (1998) Issue 6 Pages 1077-1083

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A simple, rapid and sensitive iodometric amplification method has been developed for the determination of microgram amounts of MnII, MnVII, CrIII and CrVI. The method is based on the prereductions of MnVII and CrVI with Na2SO3, the oxidations of both MnII and CrIII in the absence of Na4P2O7 and the oxidation of only MnII in its presence with excess periodate in acetate buffer (pH=3.0), removal of the unreacted periodate by masking with molybdate and the subsequent titration of liberated iodine after adding iodide. The individual amounts of MnII, MnVII, CrIII and CrVI in different test solutions were successfully determined by this method, which offers 20-fold and 12-fold amplification for Mn and Cr, respectively.

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© 1998 by The Japan Society for Analytical Chemistry
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