Journal
FOOD ANALYTICAL METHODS
Volume 2, Issue 3, Pages 221-225Publisher
SPRINGER
DOI: 10.1007/s12161-008-9054-z
Keywords
Chromogenic; Iron Determination; Spectrophotometry; 2,6-bis(1-hydroxy-2-naphthylazo) pyridine (PBN)
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A newly synthesized bis-azo dye, 2,6-bis(1-hydroxy-2-naphthylazo)pyridine (PBN) was used as a sensitive reagent for iron. To determine the metal ion using a spectrophotometer in the concentration range between 0.3 and 2.76 ppm (molar absorptivity of 2.65 x 10(4) l mol(-1) cm(-1) at 550 nm). In a phosphate-buffered medium, none of the transition metals, except Fe(II), Co(II), Ni(II), Cu(II), and Hg(II), produced color with the reagent; however, colors produced by Co(II), Ni(II), Cu(II), and Hg(II) could be masked using thiosemicarbazide, therefore, making the reagent highly selective for iron determination. The reagent was applied for the estimation of iron levels in milk, food grains, and tea samples and the results were compared with the iron levels found in those samples using AAS.
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