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https://repositorio.ufba.br/handle/ri/14402
metadata.dc.type: | Artigo de Periódico |
Title: | Determination of mercury in biological samples by cold vapor atomic absorption spectrometry following cloud point extraction with salt-induced phase separation |
Other Titles: | Talanta |
Authors: | Dittert, Ingrid M. Maranhão, Tatiane A. Borges, Daniel L. G. Vieira, Mariana A. Welz, Bernhard Curtius, Adilson José |
metadata.dc.creator: | Dittert, Ingrid M. Maranhão, Tatiane A. Borges, Daniel L. G. Vieira, Mariana A. Welz, Bernhard Curtius, Adilson José |
Abstract: | Method development for the pre-concentration of mercury in human hair, dogfish liver and dogfish muscle samples using cloud-point extraction and cold vapor atomic absorption spectrometry is demonstrated. Before the extraction, the samples were submitted to microwave-assisted digestion in a mixture of H2O2 and HNO3. Cloud point extraction was carried out using 0.5% (m/v) ammonium O,O-diethyldithiophosphate (DDTP) as the chelating agent and 0.3% (m/v) Triton X-114 as the non-ionic surfactant. Phase separation was induced after the addition of Na2SO4 to a final concentration of 0.2 mol L−1. Aliquots of the final extract were transferred to PTFE tubes and NaBH4 and HCl were added. The mercury vapor was driven to a non-heated quartz tube for measuring the absorbance. The results obtained with salt-induced phase separation were in good agreement with the certified values at a 95% confidence level. An enrichment factor of 10 allowed a detection limit of 0.4 ng g−1 to be obtained, which demonstrates the high sensitivity of the proposed procedure for the determination of mercury at trace levels. |
Keywords: | Cloud point extraction Cold vapor atomic absorption spectrometry Mercury Biological samples O,O-diethyl dithiophosphate Triton X-114 |
metadata.dc.rights: | Acesso Aberto |
URI: | http://repositorio.ufba.br/ri/handle/ri/14402 |
Issue Date: | 2007 |
Appears in Collections: | Artigo Publicado em Periódico (Química) |
Files in This Item:
File | Description | Size | Format | |
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1-s2.0-S0039914007001403-main.pdf | 321,34 kB | Adobe PDF | View/Open |
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