Abstract

A water-soluble octabromoporphyrin has been synthesized and developed for the determination of lithium ion in aqueous solution. The porphyrin reacts with lithium ion in alkaline solution to form the lithium complex along with a shift of absorption maximum to shorter wave length. But sodium and potassium ions do not react with the porphyrin. The equilibrium constant of the Li(I) porphyrin complex was determined and applied to the determination of lithium(I) in natural water. Interference of metal ions was removed by ligand buffer of Mg-EDTA complex.

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