226Ra dynamic lixiviation from phosphogypsum samples by an automatic flow-through system with integrated renewable solid-phase extraction

The release of 226Ra from phosphogypsum (PG) was evaluated by developing a novel tool for fully automated 226Ra lixiviation from PG integrating extraction/pre-concentration using a renewable sorbent format. Eight leached fractions (30mL each one) and a residual fraction were analyzed allowing the ev...

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Veröffentlicht in:Talanta (Oxford) 2017-05, Vol.167, p.398-403
Hauptverfasser: Ceballos, Melisa Rodas, Borràs, Antoni, García-Tenorio, Rafael, Rodríguez, Rogelio, Estela, José Manuel, Cerdà, Víctor, Ferrer, Laura
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Sprache:eng
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Zusammenfassung:The release of 226Ra from phosphogypsum (PG) was evaluated by developing a novel tool for fully automated 226Ra lixiviation from PG integrating extraction/pre-concentration using a renewable sorbent format. Eight leached fractions (30mL each one) and a residual fraction were analyzed allowing the evaluation of dynamic lixiviation of 226Ra. An automatic system allows this approach coupling a homemade cell with a 226Ra extraction/pre-concentration method, which is carried out combining two procedures: Ra adsorption on MnO2 and its posterior co-precipitation with BaSO4. Detection was carried out with a low-background proportional counter, obtaining a minimum detectable activity of 7Bqkg−1. Method was validated by analysis of a PG reference material (MatControl CSN-CIEMAT 2008), comparing the content found in fractions (sum of leached fractions + residual fraction) to the reference value. PG samples from Huelva (Spain) were studied. 226Ra average activity concentration of the sum of leached fractions with artificial rainwater at pH 5.4±0.2 was 105±3Bqkg−1d.w. representing a 226Ra lixiviation of 37%; while at pH 2.0±0.2, it was 168±3Bqkg−1 d.w., which represents a 50%. Also, static lixiviation, maintaining the same experimental conditions, was carried out indicating that, for both considered pH, the 226Ra release from PG is up to 50% higher in a dynamic leaching that in a static one, may have both environmental and reutilization implications. [Display omitted] •Dynamic lixiviation of 226Ra from phosphogypsum is reported for first time.•An automatic system allows the 226Ra lixiviation, extraction and pre-concentration.•226Ra release from phosphogypsum in dynamic lixiviation is up to 37% higher than by static lixiviation.
ISSN:0039-9140
1873-3573
DOI:10.1016/j.talanta.2017.02.036