title: Trace level determination of beryllium in natural and flavored mineral waters after pre-concentration using activated carbon.
abstract: The concentrations of beryllium (Be) in natural and flavored mineral water samples were determined by flame atomic absorption spectrophotometer (FAAS) after pre-concentration based on the complexation of Be(+2) with a mixture of acetylacetone (pentane-2,4-dione) plus morin (3,5,7,2',4'-pentaoxyflavone) and adsorption on activated carbon. The adsorbed complex was eluted with 1.5 ml of 2.0 M HNO(3) and evaporated to dryness. After adding 1.5 ml of 2 M HNO(3) and centrifuging, Be in acid solution was determined by FAAS. To remove a number of metals present in water, EDTA was used as a chelating agent. Beryllium in mineral water samples was pre-concentrated by 500-fold, taking 750 ml as initial sample and 1.5 ml as the final volume. The relative standard deviations were sufficiently low for practical purposes and recoveries were up to 85%. Spiking experiments were performed in real samples to establish accuracy and recoveries. The limits of detection and quantification were 0.01 and 0.03 ng ml(-1), respectively. Twenty samples were analyzed for their beryllium content using optimum parameters. The highest concentration of beryllium was found to be 0.94 ± 0.15 ng ml(-1) in a natural mineral water, while beryllium was not detected in five samples.
authors.affiliation: Laboratory of Chemical Analysis, Department of Chemistry, Faculty of Science, Dicle University, 21280, Diyarbakir, Turkey. kilincersin@gmail.com
authors.forename: Ersin
authors.initials: E
authors.lastname: Kılınç
authors.forename: Sezgin
authors.initials: S
authors.lastname: Bakırdere
authors.forename: Mehmet
authors.initials: M
authors.lastname: Yaman
mesh_terms: D001608:Beryllium / Q000032:analysis* / Q000737:chemistry / Q000302:isolation & purification; D001628:Beverages / Q000032:analysis*; D002138:Calibration; D005419:Flavonoids / Q000737:chemistry; D005506:Food Contamination; D007202:Indicators and Reagents / Q000737:chemistry; D057230:Limit of Detection; D008832:Microchemistry / Q000379:methods; D008900:Mineral Waters / Q000032:analysis*; D010422:Pentanones / Q000737:chemistry; D015203:Reproducibility of Results; D013054:Spectrophotometry, Atomic; D014421:Turkey; D047309:Flavones
chemical_list: D001608:Beryllium; D005419:Flavonoids; D007202:Indicators and Reagents; D008900:Mineral Waters; D010422:Pentanones; C008790:acetylacetone; C008548:morin; D047309:Flavones