Determination of ultra trace arsenic species in water samples by hydride generation atomic absorption spectrometry after cloud point extraction

作者：Ulusoy Halil Ibrahim^*; Akcay Mehmet; Ulusoy Songul; Gurkan Ramazan

来源：Analytica Chimica Acta, 2011, 703(2): 137-144.

DOI：10.1016/j.aca.2011.07.026

• Arsenic speciation
• Pyronine B
• Cloud point extraction
• Hydride generation atomic absorption spectrometry

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 13 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 1 M 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 mu g L(-1) with a correlation coefficient of 0.9918 was obtained with a calibration curve in the range of 0.03-4.00 mu g 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.

• 出版日期2011-10-10