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• W2068372989 abstract "A novel dispersive liquid-liquid microextraction-solidified floating organic drop (DLLME-SFOD) method combined with fiber optic-linear array detection spectrophotometry has been developed for the indirect determination of selenium. The method is based on the oxidation of the I(-) to iodine by inorganic Se(IV). The produced I2 reacts with the excess of I(-) ions in acidic media to give triiodide ions. The I3(-) is then extracted into 1-undecanol by DLLME-SFOD upon the formation of an ion pair with cetyltrimethylammonium cation. The extracted ion pair is determined by measuring its absorption at 360 nm. The absorbance signal is proportional to the selenium concentration in the aqueous phase. Under optimum conditions, the method provided an enrichment factor of 250 with a detection limit of 16.0 μg L(-1) and a linear dynamic range of 40.0-1000.0 μg L(-1). The relative standard deviation was found to be 2.1% (n=7) at 100.0 μg L(-1) concentration level. The method was successfully applied to th e determination of selenium in water samples and selenium plus tablet." @default.
• W2068372989 created "2016-06-24" @default.
• W2068372989 creator A5019977036 @default.
• W2068372989 creator A5025439875 @default.
• W2068372989 creator A5080501649 @default.
• W2068372989 date "2013-12-01" @default.
• W2068372989 modified "2023-10-02" @default.
• W2068372989 title "Indirect spectrophotometric determination of ultra trace amounts of selenium based on dispersive liquid–liquid microextraction–solidified floating organic drop" @default.
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• W2068372989 doi "https://doi.org/10.1016/j.saa.2013.07.004" @default.
• W2068372989 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/23896290" @default.
• W2068372989 hasPublicationYear "2013" @default.
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