Extraction-spectrophotometric determination of trace iron (II) in sea water with 2-[2-(3,5-dibromopyridyl)azo]-5-diethylaminobenzoic acid |
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Authors: | Tadao Sakai Miho Nakayama Takeo Katami Masamichi Furukawa |
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Affiliation: | (1) Department of Chemistry, Asahi University, 1851 Hozumi, Hozumi-cho, 501-02 Gifu, Japan;(2) Government Industrial Research Institute, Nagoya, Kita-ku, 462 Nagoya-shi, Japan |
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Abstract: | An extraction-spectrophotometric method is described for the determination of traces of iron(II) with 2-[2-(3,5-dibromopyridyl)azo]-5-diethyl-aminobenzoic acid. The reagent forms a stable and blue 12 iron/reagent complex that can be extracted into chloroform. The apparent molar absorptivity of the iron(II) complex is 1.09 × 105 1 mol–1 cm–1 at 624 nm in chloroform. The reagent is relatively selective; interferences from cobalt, copper, nickel and vanadium can be removed by using dimethylglyoxime and EDTA. The method is applied to the determination of iron (II) in sea water and aluminium alloys with good precision and accuracy. |
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Keywords: | iron(II) determination extraction-spectrophotometry sea water 2-[2-(3,5-dibromopyridyl)azo]-5-diethylaminobenzoic acid |
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