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Method of Low Tantalum Amounts Determination in Niobium and Its Compounds by ICP-OES Technique

Method of Low Tantalum Amounts Determination in Niobium and Its Compounds by ICP-OES Technique

Marek Smolik, Magdalena Turkowska

Talanta. 2013 Oct 15;115:184-9.

PMID: 24054577

Abstract:

A method of determination of low amounts of tantalum in niobium and niobium compounds without its prior separation by means of inductively coupled plasma optical emission spectrometry (ICP-OES) has been worked out. The method involves dissolution of the analyzed samples of niobium as well as its various compounds (oxides, fluorides, chlorides, niobates(V)) in fluoride environments, precipitation of sparingly soluble niobic(tantalic) acid (Nb2O5(Ta2O5) · xH2O), converting them into soluble complex compounds by means of oxalic acid with addition of hydrogen peroxide and finally analyzing directly obtained solutions by ICP-OES. This method permits determination of Ta in niobium at the level of 10(-3)% with relatively good precision (≤ 8% RSD) and accuracy (recovery factor: 0.9-1.1). Relative differences in the results obtained by two independent methods (ICP-OES and ICP-MS) do not exceed 14%, and other elements present in niobium compounds (Ti, W, Zr, Hf, V, Mo, Fe, Cr) at the level of 10(-2)% do not affect determination.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP7783688	Niobium(V) fluoride		7783-68-8	Price
AP7783713	Tantalum(V) fluoride		7783-71-3	Price

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