Determination of tantalum in high alloy steel by the extraction with high molecular weight amine-benzene solution

Furuya, Kenichi; Fujimura, Kazuyoshi; Tsurumi, Chikao

doi:10.2116/bunsekikagaku.20.535

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1983

1988

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“…The reaction of the niobium and the tantalum complexes involving an auxiliary complexing agent (L) with PAR was studied over a pH range [3][4][5][6].…”

Section: Kineticsmentioning

confidence: 99%

Kinetic Determination of Tantalum in the Presence of Niobium

Yamada

Anma²,

Murata³

1988

ANAL. SCI.

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The rates of the ligand substitution reactions of niobium and tantalum complexes involving oxalate, tartrate, citrate or nitrilotriacetate as an auxiliary complexing agent with 4-(2-pyridylazo)resorcinol have been studied spectrophotometrically in acidic media. In the citrate system at pH 5, the maximum difference in rate of substitution between the niobium and the tantalum complexes was achieved. Under the chosen conditions, where the total concentrations of citrate and 4-(2-pyridylazo)resorcinol are 2x102 and 1x104 -mol dm-3 respectively, the absorbance change during the reaction progress can be kinetically separated for each metal ion and less reactive tantalum in the range 10-6-10-5 mol dm-3 can be determined by a logarithmic extrapolation method. In the determination of 5x10-6 mol dm-3 of tantalum, the presence of 5-fold amounts (by molarity) of niobium can be tolerated. The effects of 52 diverse ions were examined.

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“…The reaction of the niobium and the tantalum complexes involving an auxiliary complexing agent (L) with PAR was studied over a pH range [3][4][5][6].…”

Section: Kineticsmentioning

confidence: 99%