Cadmium and Lead Determination in Freshwater and Hemodialysis Solutions by Thermospray Flame Furnace Atomic Absorption Spectrometry Following Cloud Point Extraction

Autor(es)

Garcia, Samara ^[1] ; Gerondi, Fabiana ^[2] ; Paixao, Thiago R. L. C. ^[3] ; Arruda, Marco A. Z. ^[2] ; Gaubeur, Ivanise ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed ABC, Ctr Ciencias Nat & Humanas, BR-09210971 Santo Andre, SP - Brazil

^[2] Univ Estadual Campinas, Inst Quim, Dept Quim Analit, BR-13082970 Campinas, SP - Brazil

^[3] Univ Sao Paulo, Inst Quim, Dept Quim Fundamental, BR-05508000 Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of the Brazilian Chemical Society; v. 26, n. 3, p. 490-497, MAR 2015.
• Citações Web of Science: 5

Resumo

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. (AU)

• Processo FAPESP: 11/19730-3 - Emprego da extração em ponto nuvem (CPE) e da microextração líquido-líquido dispersiva (DLLME) no desenvolvimento de métodos analíticos para a pré-concentração e determinação espectrométrica de metais
• Beneficiário: Ivanise Gaubeur
• Modalidade de apoio: Auxílio à Pesquisa - Regular