LIQUID-LIQUID EXTRACTION AND SPECTROPHOTOMETRIC CHARACTERIZATION OF SOME NEW TERNARY IONASSOCIATION COMPLEXES OF COBALT (II) AND NICKEL (II)
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Abstract
Complex formation and liquid-liquid extraction were studied in systems containing M(II) (M
= cobalt or nickel), 2-hydroxy-5-iodothiophenol (HITP), hydrophobic amines (Am), water
and chloroform. Two different Am were used: diphenylguanidine (DPG) and
triphenylguanidine (TPG).The optimum conditions for extraction of Co(II) and Ni(II) as
ternary complexes with the general formula [M(HITP)2](AmH+
)2 were found: pH, shaking
time, concentration of HITP and concentration of Am. Some key constants (constants of
extraction – Kex, constants of association – β, constants of distribution – KD) and analytical
characteristics (molar absorptivities – εmax, Sandell’s sensitivities – SS, limits of detection –
LOD, limits of quantification – LOQ, etc.) were determined.
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