Alternative spectrophotometric determination of niobium and tantalum with o-hydroxyhydroquinonephthalein in cationic surfactant micellar media View Full Text


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Article Info

DATE

1992-01

AUTHORS

Itsuo Mori, Yoshikazu Fujita, Minako Toyoda, Sachiko Kubo

ABSTRACT

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 μg of niobium and up to 18.0 μg 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 μg/cm2 niobium at 520 nm and 0.00085 μg/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. More... »

PAGES

80-82

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf00321696

DOI

http://dx.doi.org/10.1007/bf00321696

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1019615327


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