Journal
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
Volume 373, Issue 4-5, Pages 299-303Publisher
SPRINGER-VERLAG BERLIN
DOI: 10.1007/s00216-002-1343-6
Keywords
Diformylhydrazine reagent; iron(III)-diformylhydrazine complexes; iron(II) determination; iron(III) determination; spectrophotometry
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The bidentate ligand diformylhydrazine (OHC-HN-NH-CHO), DFH, combines with iron(II) and iron(III) in alkaline media in the pH range 7.3-9.3 to form an intensely colored red-purple iron(III) complex with an absorption maximum at 470 nm. Beer's law is obeyed for iron concentrations from 0.25 to 13 mug mL(-1). The molar absorptivity was in the range 0.3258x10(4)-0.3351x10(4) L mol(-1) cm(-1) and Sandell's sensitivity was found to be 0.0168 mug cm(-2). The method has been applied to the determination of iron in industrial waste, ground water, and pharmaceutical samples.
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