title: Preconcentration of trace amounts of cadmium in aqueous samples on minicolumns packed with Chromosorb series gas chromatographic stationary phases and its determination by electrothermal atomic absorption spectrometry.
abstract: The adsorption characteristics of five commercially available Chromosorb GC stationary phases towards Cd2+ and their application to the preconcentration and ETAAS determination of Cd2+ in several water samples were studied. The experimental results indicated that although all of the five Chromosorb GC stationary phases studied can retain Cd2+ quantitatively from aqueous solutions at appropriate pH values without adding chelating reagent. Chromosorb 105 displayed the highest adsorption capacity. A highly sensitive, simple methodology for preconcentration and ETAAS determination of trace amounts of cadmium in natural water samples using a Chromosorb 105 packed minicolumn is proposed. Conditions for quantitative and reproducible preconcentration, elution and subsequent ETAAS determination were established. The high retention efficiency (> 95%) for Cd2+ provides a sensitivity enhancement of 100-fold for a 200 mL sample volume with a detection limit of 6.2 ng L(-1) (3 sigma).
authors.affiliation: Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing.
authors.forename: Y
authors.initials: Y
authors.lastname: Cai
authors.forename: G
authors.initials: G
authors.lastname: Jiang
authors.forename: J
authors.initials: J
authors.lastname: Liu
mesh_terms: D002104:Cadmium / Q000032:analysis*; D002849:Chromatography, Gas / Q000379:methods; D006801:Humans; D006863:Hydrogen-Ion Concentration; D013054:Spectrophotometry, Atomic / Q000379:methods; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D014874:Water Pollutants, Chemical; D002104:Cadmium