Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10559828 | Talanta | 2011 | 5 Pages |
Abstract
A novel, simple and green procedure is presented for the determination of boron. The method is based on ultrasound-assisted conversion of boron to tetrafluoroborate anion and the formation of an ion pair between BF4â and Astra Phloxine reagent (R), followed by dispersive liquid-liquid microextraction of the ion pair formed and subsequent UV-vis spectrophotometric detection. The conversion of boron to tetrafluoroborate anion is performed in an acidic medium of 0.9 mol Lâ1 H2SO4 in the presence of 0.1 mol Lâ1 F- by means of 10 min of ultrasonication. The extraction of the ion pair formed between BF4â and R (1 Ã 10â4 mol Lâ1 R) is carried out by dispersive liquid-liquid microextraction using 0.5 mL of amyl acetate (as extraction solvent), tetrachloromethane (as auxiliary solvent) and acetonitrile (as dispersive solvent) in a ratio of 1:1:2. The absorbance of the coloured extracts obeys Beer's law in the range 0.22-18.7 mg Lâ1 of B(III) at 553 nm wavelength. The limit of detection calculated from a blank test (n = 10) based on 3 s is 0.015 mg Lâ1 of B(III). The method was applied to the determination of boron in mineral waters.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Lenka Rusnáková, Vasil Andruch, Ioseph S. Balogh, Jana Å krlÃková,