Abstract
The formation of ternary complexes of lanthanide–calix[4]arene with sulphophthalein dyes was studied. The extraction of model system Gd(III)–calix[4]arene–bromothymol blue was characterized and the distribution, extraction, and stability constants were determined. The applicability of studied system for spectrophotometric determination of lanthanides was demonstrated and parameters of calibration dependences were calculated.
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