Spectrophotometric Study on the Extraction of Cobalt and Iron Chelates of 7-Nitroso-8-Hydroxy-Quinoline-5-Sulphonic Acid with Zephiramine
作者:
T. Ozaki,
期刊:
Analytical Letters
(Taylor Available online 1982)
卷期:
Volume 15,
issue 7
页码: 595-610
ISSN:0003-2719
年代: 1982
DOI:10.1080/00032718208064404
出版商: Taylor & Francis Group
关键词: 7-nitroso-8-hydroxyquinoline-5-sulphonic acid;cobalt;iron;zephiramine
数据来源: Taylor
摘要:
7-Nitroso-8-hydroxyquinoline-5-sulphonic acid (H2NQS) was used as a chelating reagent for ion-pair extraction of cobalt (II) and iron (II) with tetradecyl-dimethyl-benzyl-ammonium chloride (zephiramine = Z+Cl-). The ternary complexes, being charge transfer complexes, had the absorption maxima at 530pm for cobalt and at 695pm for iron. The optinum pH ranges for the extraction were 3.5-8.0 and 4.5-8.5 for cobalt and iron respectively. The compositions of the ternary complexes were Co(NQS)3Z3and Fe(NQS)3Z4. In the presence of adequate amounts of sodium chloride, the excess of reagent in the organic phase can be removed into the aqueous phase. The exchange equilibrium constants for the metal complex anion and the chloride ion were calculated to be K3Cl−Fe(NQS)33=9.38 and K4Cl−Fe(NQS)34= 8.39.
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