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Fluorescence enhancement of dysprosium, europium and terbium using sodium benzoate-trioctylphosphine oxide-Triton X-100

✍ Scribed by Susy Peter; B.S. Panigrahi; K.S. Viswanathan; C.K. Mathews

Publisher: Elsevier Science
Year: 1992
Tongue: English
Weight: 472 KB
Volume: 260
Category: Article
ISSN: 0003-2670
DOI: 10.1016/0003-2670(92)80137-v

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✦ Synopsis

The fluorescence of dysprosium, europium and terbium was enhanced by three to four orders of magnitude when these lanthanides were excited in the presence of sodium benzoate, trioctylphosphine oxide and Triton X-100 in aqueous solutions at pH = 5.5. In all instances the excitation wavelength was ca. 280 nm, corresponding to the benzoate absorption. The enhancement of fluorescence leads to improved detection limits of lo-' M for terbium and 10e8 M for dysprosium and europium.

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In aqueous solution, the fluorescence mtenslty 1s a hnear function of concentration m the ranges 1 0 X 10d4-1 0 X 1 0m6 M Sm and 1 0 x 10-6-1.0 X lo-' M Tb and Eu The optimum condltlons are 1 x 10m3 M hexafluoroacetylacetone, 1 X 10m4 M tnoctylphosphme oxide and 0.05% Tnton X-100 at pH 3 0