A green and efficient procedure for the preconcentration and determination of cadmium, nickel and zinc from freshwater, hemodialysis solutions and tuna fish samples by cloud point extraction and flame atomic absorption spectrometry

Author(s)

Galbeiro, Rafaela ; Garcia, Samara ; Gaubeur, Ivanise

• Document type: Journal article
• Source: JOURNAL OF TRACE ELEMENTS IN MEDICINE AND BIOLOGY; v. 28, n. 2, p. 6-pg., 2014-01-01.

Abstract

Cloud point extraction (CPE) was used to simultaneously preconcentrate trace-level cadmium, nickel and zinc for determination by flame atomic absorption spectrometry (FAAS). 1-(2-Pyridilazo)-2-naphthol (PAN) was used as a complexing agent, and the metal complexes were extracted from the aqueous phase by the surfactant Triton X-114 ((1,1,3,3-tetramethylbutyl)phenyl-polyethylene glycol). Under optimized complexation and extraction conditions, the limits of detection were 0.37 mu g L-1 (Cd), 2.6 mu g L-1 (Ni) and 2.3 mu g L-1 (Zn). This extraction was quantitative with a preconcentration factor of 30 and enrichment factor estimated to be 42, 40 and 43, respectively. The method was applied to different complex samples, and the accuracy was evaluated by analyzing a water standard reference material (NIST SRM 1643e), yielding results in agreement with the certified values. (C) 2013 Elsevier GmbH. All rights reserved. (AU)

• FAPESP's process: 11/19730-3 - Cloud point extraction (CPE) and dispersive liquid-liquid microextraction (DLLME) applied in the development of analytical methods for metals preconcentration and spectrometric determination
• Grantee: Ivanise Gaubeur
• Support Opportunities: Regular Research Grants
• FAPESP's process: 11/02798-4 - Determination by atomic absorption spectrometry of cadmium, nickel and zinc ions after pre concentration by cloud point extraction
• Grantee: Rafaela Galbeiro
• Support Opportunities: Scholarships in Brazil - Master