Please use this identifier to cite or link to this item:
|Type:||Artigo de periódico|
|Title:||Cadmium And Lead Determination In Freshwater And Hemodialysis Solutions By Thermospray Flame Furnace Atomic Absorption Spectrometry Following Cloud Point Extraction|
|Abstract:||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.|
|Editor:||Sociedade Brasileira de Quimica|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.