| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1166715 | Analytica Chimica Acta | 2011 | 8 Pages |
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 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 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.
Graphical abstractThe possible complex formation mechanism for ultra-trace As determination.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► CPE/HGAAS system for arsenic determination and speciation in real samples has been applied first time until now. ► The proposed method has the lowest detection limit when compared with those of similar CPE studies present in literature. ► The linear range of the method is highly wide and suitable for its application to real samples.
