title: Determination of ultra trace arsenic species in water samples by hydride generation atomic absorption spectrometry after cloud point extraction.
abstract: Cloud point extraction (CPE) methodology has successfully been employed for the preconcentration of ultra-trace arsenic species in aqueous samples prior to hydride generation atomic absorption spectrometry (HGAAS). As(III) has formed an ion-pairing complex with Pyronine B in presence of sodium dodecyl sulfate (SDS) at pH 10.0 and extracted into the non-ionic surfactant, polyethylene glycol tert-octylphenyl ether (Triton X-114). After phase separation, the surfactant-rich phase was diluted with 2 mL of 1M HCl and 0.5 mL of 3.0% (w/v) Antifoam A. Under the optimized conditions, a preconcentration factor of 60 and a detection limit of 0.008 μg L(-1) with a correlation coefficient of 0.9918 was obtained with a calibration curve in the range of 0.03-4.00 μg L(-1). The proposed preconcentration procedure was successfully applied to the determination of As(III) ions in certified standard water samples (TMDA-53.3 and NIST 1643e, a low level fortified standard for trace elements) and some real samples including natural drinking water and tap water samples.
authors: University of Cumhuriyet, Faculty of Science, Department of Chemistry, TR-58140, Sivas, Turkey. hiulusoy@yahoo.com
authors: Halil İbrahim
authors: Hİ
authors: Ulusoy
authors: Mehmet
authors: M
authors: Akçay
authors: Songül
authors: S
authors: Ulusoy
authors: Ramazan
authors: R
authors: Gürkan