A new gravimetric method for determination of tantalum

Abstract

A gravimetric method was developed for the determination of tantalum in samples containing many other kinds of metal and nonmetal ions such as niobium. Tetraphenylarsonium chloride hydrochloride (TPAC) was used as a highly selective precipitant for Ta as fluorotantalate in a medium containing 0.11-0.22 mol/L NH4HF2. An ion associate, (C6H5)4AsTaF6, which is a white needle with good thermal stability is formed. The ion associate is decomposed to tantalum pentoxide after heating to 900? Twenty foreign ions present in the original sample do not interfere. Thermal properties of (C6H5)4AsTaF6 were studied in detail. The recovery of tantalum was 98.1-101.8% and the result of analyses of a nickel-based alloy was 1.80 ?0.027% Ta.

Key words: SPECIFIC REAGENTS, CHLORIDE, TANTALUM, BENZENE P, HYDROFLUORIC ACID, GRAVIMETRIC METHOD, SEDIMENTATING AGENTS, PHOSPHONIUM COMPOUNDS

CLC Number:

O651

Cite this article

SHEN ZHIHONG;XU RONG. A new gravimetric method for determination of tantalum[J]. Acta Chimica Sinica, 1988, 46(1): 69-72.

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