%0 Generic %A Garcia, Samara %A Gerondi, Fabiana %A Paixão, Thiago R. L. C. %A A. Z. Arruda, Marco %A Gaubeur, Ivanise %D 2017 %T Cadmium and Lead Determination in Freshwater and Hemodialysis Solutions by Thermospray Flame Furnace Atomic Absorption Spectrometry Following Cloud Point Extraction %U https://scielo.figshare.com/articles/dataset/Cadmium_and_Lead_Determination_in_Freshwater_and_Hemodialysis_Solutions_by_Thermospray_Flame_Furnace_Atomic_Absorption_Spectrometry_Following_Cloud_Point_Extraction/5669311 %R 10.6084/m9.figshare.5669311.v1 %2 https://ndownloader.figshare.com/files/9907999 %2 https://ndownloader.figshare.com/files/9908002 %2 https://ndownloader.figshare.com/files/9908014 %2 https://ndownloader.figshare.com/files/9908020 %2 https://ndownloader.figshare.com/files/9908026 %2 https://ndownloader.figshare.com/files/9908029 %2 https://ndownloader.figshare.com/files/9908035 %2 https://ndownloader.figshare.com/files/9908038 %2 https://ndownloader.figshare.com/files/9908041 %K cloud point extraction %K cadmium %K lead %K DPKSH %K TS-FF-AAS %X

Cloud point extraction was employed for the separation and preconcentration of cadmium and lead prior to the determination by thermospray flame atomic absorption spectrometry. Di-2- pyridyl ketone salicyloylhydrazone (DPKSH) was used as complexing agent and the cadmium and lead complexes were extracted from the aqueous phase by the Triton X-114 surfactant. The variables associated with the preconcentration (pH as well as DPKSH, surfactant and electrolyte concentration) were optimized by using a full factorial design with two levels, four variables and a central composite. Under the optimized conditions, a sample volume of 100 µL was introduced into a hot Ti tube at a flow rate of 0.6 mL min-1 and the integrated absorbance was measured. Calibration curves were obtained with linear ranges of 0.075-2.0 µg L−1 (Cd) and 2.5-100 µg L−1 (Pb). The detection limits of 0.04 µg L−1 (Cd) and 1.3 µg L−1 (Pb) (99.7% confidence level) were obtained. The proposed method was applied to hemodialysis solutions and water samples. The accuracy of the method was evaluated by analyzing a certified reference material (NIST CRM 1643e) and the results were in agreement with the certified values at a 95% confidence level according to t-test.

%I SciELO journals