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Cloud Point Extraction for the Determination of Cadmium and Lead in Biological Samples by Graphite Furnace Atomic Absorption Spectrometry by Tatiane de A. Maranhão; Daniel L.G. Borges; Márcia A.M.S. da Veiga; Adilson J. Curtius is a Chemistry article available to read on EtoBox.
What is Cloud Point Extraction for the Determination of Cadmium and Lead in Biological Samples by Graphite Furnace Atomic Absorption Spectrometry about?
The phase-separation phenomenon of non-ionic surfactants occurring in aqueous solution was used for the extraction of Cd and Pb from digested biological samples. After complexation with O,O-diethyldithiophosphate (DDTP) in hydrochloric acid medium, the analytes are quantitatively extracted to the phase rich in the non-ionic surfactant octylphenoxypolyethoxyethanol (Triton X-114) after centrifugation. Methanol acidified with 0.1 mol L À1 HNO 3 was added to the surfactant-rich phase prior to its analysis by electrothermal atomic absorption spectrometry (ET AAS). The adopted concentrations for DDTP, Triton X-114 and hydrochloric acid were all optimized. Pyrolysis and atomization temperatures were optimized using the extracts and pyrolysis temperatures of 700 8C for both elements and atomization temperatures of 1400 and 1600 8C for cadmium and lead, respectively, were used without adding any modifier, which shows that considerable analyte stabilization is provided by the medium itself. A more detailed investigation was carried out to determine which components of the extract were responsible for the high thermal stability achieved and it revealed that the amount of DDTP added and the p
Who reads Cloud Point Extraction for the Determination of Cadmium and Lead in Biological Samples by Graphite Furnace Atomic Absorption Spectrometry?
It is typically read by researchers, students, and practitioners in Chemistry.
- Author
- Tatiane de A. Maranhão; Daniel L.G. Borges; Márcia A.M.S. da Veiga; Adilson J. Curtius
- Publisher
- Elsevier Science; Elsevier ; Elsevier BV (ISSN 0584-8547)
- Published
- 2005
- Language
- EN
- Field
- Chemistry (Physical Sciences)