Separation of niobium and tantalum with benzo- and phenylacetylhydroxamic acids |
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Authors: | A.K. Majumdar Bijoli K. Pal |
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Affiliation: | Department of Inorganic and Analytical Chemistry, Jadavpur University, CalcuttaIndia |
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Abstract: | Benzohydroxamic acid (I) or phenylacetylhydroxamic acid (II) is suggested for the quantitative separation of tantalum from niobium in an oxalate solution. The tantalum precipitate must be ignited for weighing; niobium is determined in the filtrate with another reagent. The pH range for complete separation is 4.0–6.4 for I and 4.5–6.2 for II. Single precipitation is satistactory for Nb: Ta ratios of 18 : 1 to 1 : 20 for I, and 8 : 1 to 1 : 23 for II. Titanium, zirconium, tartrate, citrate and a large excess of oxalate interfere. |
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