Tris(4,7-dihydroxy-1,10-phenanthroline)iron(II) as a low-potential oxidation-reduction indicator: determination of hydrosulphite.
The formal reduction potential of the tris(4,7-dihydroxy-1,10-phenanthroline)iron(III,II) couple is -0.06 V in the pH range 10-13, not -0.11 V as reported earlier. The couple forms an excellent visual oxidation-reduction indicator for the titration of sodium hydrosulphite with potassium ferricyanide in alkaline solution.
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Department of Chemistry, Iowa State University, Ames, Iowa 50011, U.S.A.
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