Simultaneous determination of some rare-earth elements by derivative fluorimetry and use of the Kalman filter.
A procedure for the simultaneous determination of dysprosium, europium, samarium and terbium by laser-induced derivative fluorimetry is described. The method is based on the use of 1 x 10(-4)M hexafluoroacetylacetone (HFA) and 2 x 10(-4)M tri-n-octylphosphine oxide (TOPO) as ligands in aqueous solution at pH 3. The first-derivative and Kalman-filter techniques were used for background correction and reduction of interference. The effects of foreign ions were investigated. The procedure is satisfactory for the simultaneous determination of these four lanthanides.
Jianjun
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Department of Chemistry, Wuhan University, 430072 Wuhan, People's Republic of China.
Yun'e
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Guanquan
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