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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
Author: Garcia S.
Gerondi F.
Paixao T.R.L.C.
Arruda M.A.Z.
Gaubeur I.
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
Rights: aberto
Identifier DOI: 10.5935/0103-5053.20150001
Date Issue: 2015
Appears in Collections:Unicamp - Artigos e Outros Documentos

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