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Flow-injection determination of thorium and uranium after on-line ion-exchange preconcentration on Dowex 50-X8

✍ Scribed by José Luis Pérez Pavón; Carmelo García Pinto; Estrella Rodríguez García; Bernardo Moreno Cordero

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
433 KB
Volume
264
Category
Article
ISSN
0003-2670

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✦ Synopsis

The preconcentratlon of thorium and uranium on Dowex 50-X8 was studled as a method for the preconcentratlon of these cations pnor to then determination by flow qectlon unth spectrophotometnc detection using Arsenazo III m 3 6 M HCI stablhzed with Tnton X-100 as chromogenic reagent The preconcentration device 1s a mmlcohunn included m the sample loop of the mjection valve A second valve contams a reducmg mmlcolumn filled with lead powder to reduce U(VI) to U(IV) before the confluence of the sample with the reagent stream The method can be apphed to samples contammg 0 5-100 pg I-' and was tested Hrlth different spiked water samples

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