1969 Volume 42 Issue 4 Pages 956-960
A new application of atomic absorption spectrophotometry to the determination of iodide has been proposed. The method is based on solvent extraction into nitrobenzene of the colorless ion-pair formed between tris(l,10-phenanthroline)cadmium(II) and the iodide anion, and the subsequent determination of the cadmium concentration in the extract by atomic absorption in an air-acetylene flame at the 2288 Å cadmium line. The absorbance due to cadmium in the extract shows a linear relationship to the concentration of iodide over the range from 4×10−6 to 4×10−5 M initially present in the aqueous solution. The optimum conditions for the determination of iodide have been established, and the extraction efficiency and the effect of other anions have also been studied.
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