Liquid-Liquid Extraction and Spectrophotometric Characterization of Some New Ion-Associated Complexes of Co(II) with Int: Application of the Developed Method for Analysis of Soil Cobalt Content
Liquid-Liquid Extraction and Spectrophotometric Characterization of Some New Ion-Associated Complexes of Co(II) with Int: Application of the Developed Method for Analysis of Soil Cobalt Content

Summary/Abstract: The study presents a newly-developed method for extraction-spectrophotometric determination of Co(II) in samples by means of iodnitrotetrazolium chloride. The electronic spectrum of cobalt ion associated has a peak at 630 nm. At that wavelength the absorption is maximum. The ratio INT: [Co(SCN)4] in the triple ion-associate complex was 2:1, and due to the good solubility of the Co(II) ion associated and INT in 1,2 dichloroethane, maximum extraction in the organic phase was achieved after 30 s extraction. The molar absorptivity of the studied ion associate INT2[Co(SCN)4] was ε630 = 0.6×103 dm3 mol-1 cm-1. Sendel’s sensitivity of the method was 9.8×10-2 mg cm-2. The maximum quantity of Co extracted with INT was achieved at pH 2-7. The relationship between Co(II) concentration and absorption was linear in the range of 6 – 125 mg Co(II) in 10 cm-3 aqueous solutions.

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