title: Separation and preconcentration of Se(IV)/Se(VI) species by selective adsorption onto nanometer-sized titanium dioxide and determination by graphite furnace atomic absorption spectrometry.
abstract: A simple and sensitive method for the selective determination of Se(IV) and Se(VI) in natural water and sludge samples through an adsorptive process on a nanometer-sized TiO(2) (anatase) was developed. The conditions for quantitative and reproducible preconcentration, elution, and subsequent GFAAS determination were established. The proposed method gave a concentration factor of 50 for a 100 mL sample volume, characterized by high precision, high reproducibility, and direct determination of Se(IV)/Se(VI). The detection limits (3 sigma, n=11) were 4.7ng L(-1) for Se(IV) and 6.3ng L(-1) for Se(VI); the precision (relative standard deviation) was 0.7% for Se(IV) and 0.9% for Se(VI) at the 0.5microg L(-1) level.
authors.affiliation: Department of Chemistry, Zhangzhou Teachers College, P R China.
authors.forename: Shunxing
authors.initials: S
authors.lastname: Li
authors.forename: Nansheng
authors.initials: N
authors.lastname: Deng
mesh_terms: D000327:Adsorption; D005618:Fresh Water / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D012623:Seawater / Q000737:chemistry; D012643:Selenium / Q000032:analysis*; D012680:Sensitivity and Specificity; D013054:Spectrophotometry, Atomic / Q000379:methods*; D013997:Time Factors; D014025:Titanium / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D014874:Water Pollutants, Chemical; C009495:titanium dioxide; D014025:Titanium; D012643:Selenium