Spectrophotometric determination of trace amounts of iron in pure reagent chemicals by solvent extraction as the ternary complex of iron(II), 4-chloro-2-nitrosophenol and Rhodamine B
- 1 January 1976
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in The Analyst
- Vol. 101 (1209) , 974-981
- https://doi.org/10.1039/an9760100974
Abstract
Trace amounts of iron in pure reagent chemicals have been determined by solvent extraction-spectrophotometry with 4-chloro-2-nitrosophenol and Rhodamine B. The ternary complex of iron(II), 4-chloro-2-nitrosophenol and Rhodamine B was extracted quantitatively into toluene at about pH 4.8. The absorbance of the organic phase was measured in a glass cell of 10-mm path length at 558 nm. The apparent molar absorptivity of the ternary complex in the organic phase was 9.0 × 104 l mol–1 cm–1 at 558 nm. The ternary complex was very stable and not decomposed by addition of EDTA. By using the above procedure, trace amounts of iron (10–7–10–4%) in alkali metal salts, alkaline earth metal salts, ammonium salts, acids and bases, etc., were determined. The standard deviations of the determinations were 1–3%.Keywords
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