Alternative spectrophotometric determination of niobium and tantalum with o-hydroxyhydroquinonephthalein in cationic surfactant micellar media |
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Authors: | Itsuo Mori Yoshikazu Fujita Minako Toyoda and Sachiko Kubo |
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Institution: | (1) Osaka University of Pharmaceutical Sciences, Matsubara-shi, 580 Osaka, Japan |
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Abstract: | Summary The alternative and simultaneous spectrophotometric determination of niobium and tantalum was examined by using the colour development between o-hydroxyhydroquinonephthalein (Qnph) and niobium or tantalum in the presence of hexadecyltrimethylammonium chloride (HTAC) in strong acidic media. Beer's law was obeyed up to 10.0 g of niobium and up to 18.0 g of tantalum in a final volume of 10.0 ml. The apparent molar absorption coefficients for niobium and tantalum were 2.18×105 and 2.09×105 l mol–1 cm–1 with Sandell's sensitivities of 0.00042 g/cm2 niobium at 520 nm and 0.00085 g/cm2 tantalum at 510 nm, respectively. The alternative assay of niobium and tantalum was possible by using two methods: Method A — masking method with oxalic acid, Method B — acid adjusting-method using 50% sulfuric acid. These methods were 2–6-times more sensitive than other methods.Application of xanthene derivatives in analytical chemistry. Part XC. Part LXXXIX see ref 1] |
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