Abstract
A ternary complex of niobium with pyrocatechol and sparteine has been investigated as a sensitive and selective system for the spectrophotometric determination of niobium. The complex is formed rapidly over a wide range of pH and is stable for several days. It is extracted quantitatively by some organic solvents. The interference from 40 cations and 10 anions has been examined, and synthetic mixtures and niobium ores have been analysed.
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