Abstract：
:A preconcentration system has been developed to determine inorganic selenium species. Selenium was retained by a column filled with polyvinyl chloride (PVC) with lanthanum hydroxide co-precipitation. Speciation was achieved by selective photoreduction previous Se preconcentration. The retention pH was optimized at 10.0. Two multivariate calibrations and a central composite design were employed for optimization of the system. Sample, reagents and acid flow rates are significant variables affecting the system. Employing HG-ICP-OES as detection, the optimized system reached a detection limit of 0.03μg/L, and an enhancement factor of 14875 (25 for preconcentration system, 595 for hydride generation). To verify the method' accuracy, two certified reference materials, BCR® 414 Plankton & IRMM-804 Rice Flour, were analysed. The system was applied to inorganic selenium speciation in several Argentinean beverages to estimate their selenium contribution to diet.
journal_name
Food Chemjournal_title
Food chemistryauthors
Escudero LA,Pacheco PH,Gasquez JA,Salonia JAdoi
10.1016/j.foodchem.2014.07.127subject
Has Abstractpub_date
2015-02-15 00:00:00pages
73-9eissn
0308-8146issn
1873-7072pii
S0308-8146(14)01175-3journal_volume
169pub_type
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