The determination of V and Mo by dispersive liquid-liquid microextraction (DLLME) combined with laser-induced breakdown spectroscopy (LIBS)

Autor(es)

de Jesus, Amanda M. D. ^{[1, 2, 3]} ; Angel Aguirre, Miguel ^{[1, 2]} ; Hidalgo, Montserrat ^{[1, 2]} ; Canals, Antonio ^{[1, 2]} ; Pereira-Filho, Edenir R. ^[3]

Afiliação do(s) autor(es)

^[1] Univ Alicante, Dept Analyt Chem & Food Sci, Fac Sci, E-03080 Alicante - Spain

^[2] Univ Alicante, Univ Inst Mat, Fac Sci, E-03080 Alicante - Spain

^[3] Univ Fed Sao Carlos, Dept Chem, BR-13565905 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Analytical Atomic Spectrometry; v. 29, n. 10, p. 1813-1818, 2014.
• Citações Web of Science: 24

Resumo

Laser-induced breakdown spectroscopy (LIBS) is a promising analytical technique with well-known advantages and limitations. However, despite its growing popularity, this technique has been applied mainly to solid samples and there have been a smaller number of studies devoted to liquid samples. This lack of studies is mainly due to experimental difficulties in the analysis of liquid matrices. Sensitivity can be improved and matrix effects minimized in the LIBS analysis of aqueous samples by using a dispersive liquid-liquid microextraction (DLLME) procedure followed by drying the extract on a suitable surface prior to laser irradiation. The combination of DLLME-LIBS is fast, easy to use, and inexpensive. The small volume of the final extract is sufficient for LIBS analysis, and the procedure generates little waste. It is likely that this combination could be automated during future work. The limits of detection (LOD) and quantification (LOQ) achieved using the proposed method were 30 and 70 mu g L-1 for Mo and 5 and 20 mu g L-1 for V, respectively. Using this method, we analyzed samples of pharmaceutical, multimineral formulation, soil, mineral water and a reference material NCS ZC 85005 (Beef Liver). In the latter, the concentration of V was below the LOQ, and the recovery of Mo was 103%. (AU)

• Processo FAPESP: 12/01769-3 - Desenvolvimento de métodos espectroanalíticos para a análise direta de amostras de lixo eletrônico e de cosméticos
• Beneficiário: Edenir Rodrigues Pereira Filho
• Linha de fomento: Auxílio à Pesquisa - Regular
• Processo FAPESP: 12/50827-6 - Readequação física dos laboratórios do grupo de análise instrumental aplicada (Gaia) para a proposição de métodos analíticos de análise de lixo eletrônico e de cosméticos
• Beneficiário: Edenir Rodrigues Pereira Filho
• Linha de fomento: Auxílio à Pesquisa - Regular