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Abstract: This paper describes selenium determination based on Se0 preconcentration in the imprinted polymer (synthesized with 2.25 mmol SeO2, 4-vinylpyridine and 1-vinylimidazole) with subsequent detection on-line in HG-FAAS. During the synthesis, SeO2 is reduced to Se (0). Therefore, there are no MIP neither IIP in the present work, thus we denominated: AIP, i.e., atomically imprinted polymers. For the optimization of analytical parameters Doehlert design was used. The method presented limit of detection and limit of quantification of 53 and 177 ng L-1, respectively, and linear range from 0.17 up to 6 μg L-1 (r = 0.9936). The preconcentration factor (PF), consumptive index (CI) and concentration efficiency (CE) were 232; 0.06 mL and 58 min-1 respectively. The proposed method was successfully applied to determine Se in Brazil nuts (0.33 ± 0.03 mg kg-1), apricot (0.46 ± 0.02 mg kg-1), white bean (0.47 ± 0.03 mg kg-1), rice flour (0.47 ± 0.02 mg kg-1) and milk powder (0.22 ± 0.01 mg kg-1) samples. It was possible to do 12 analyzes per hour. Accuracy was checked and confirmed by analyzing certified reference material (DORM-2, dogfish muscle), and samples precision was satisfactory with RSD lower than 10%
Template and target information: selenium, Se(0)
Author keywords: selenium, imprinted polymer, Hydride generation flame atomic absorption spectrometry, preconcentration