Hyphenation of single-drop microextraction with laser-induced breakdown spectrometry for trace analysis in liquid samples: a viability study

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Títol: Hyphenation of single-drop microextraction with laser-induced breakdown spectrometry for trace analysis in liquid samples: a viability study
Autors: Aguirre Pastor, Miguel Ángel | Nikolova, H. | Hidalgo, Montserrat | Canals, Antonio
Grups d'investigació o GITE: Espectroscopía Atómica-Masas y Química Analítica en Condiciones Extremas
Centre, Departament o Servei: Universidad de Alicante. Departamento de Química Analítica, Nutrición y Bromatología | Universidad de Alicante. Instituto Universitario de Materiales
Paraules clau: Single drop microextraction | Laser-induced breakdown spectrometry | Trace analysis | Liquid samples
Àrees de coneixement: Química Analítica
Data de publicació: 2015
Editor: Royal Society of Chemistry
Citació bibliogràfica: Analytical Methods. 2015, 7: 877-883. doi:10.1039/C4AY02218A
Resum: In this work, an analytical methodology based on single drop microextraction (SDME) followed by Laser-Induced Breakdown Spectrometry (LIBS) has been tested for trace metal determination in liquid samples. By this method, analytes in the samples were extracted into a small volume of toluene as ammonium pyrrolidinedithiocarbamate (APDC) chelates. After that, the analyte-enriched toluene was dried on a solid substrate and, finally, the resulting solid residue was analyzed by LIBS. Analyte extraction by the SDME procedure was optimized for the first time by using a multivariate optimization approach. Under optimum SDME conditions, analytical figures of merit of the proposed SDME-LIBS methodology were compared to those of the direct LIBS analysis method (i.e., without the SDME procedure). An estuarine water certified reference material was analyzed for method trueness evaluation. The results obtained in this study indicate that SDME-LIBS methodology leads to a sensitivity increase of about 2.0–2.6 times the ones obtained by LIBS. Detection limits of SDME-LIBS decrease according to the obtained sensitivity improvement, reaching values in the range 21–301 μg kg−1 for the analytes tested. The measurement repeatability was similar in both SDME-LIBS (13–20% RSD) and LIBS (16–20% RSD) methodologies, mainly limited by the LIBS experimental setup used in this work for LIBS analysis of liquid samples. The SDME-LIBS analysis of the certified reference material led to recovery values in the range of 96% to 112%.
Patrocinadors: The authors are grateful to the Spanish Government (projects CTQ2011-23968) and the Regional Government of Valencia (Spain) (ACOMP/2013/072) for the financial support. M.A.A. is grateful to the University of Alicante for his PhD fellowship. This work is part of the PhD degree of M.A.A.
URI: http://hdl.handle.net/10045/44612
ISSN: 1759-9660 (Print) | 1759-9679 (Online)
DOI: 10.1039/C4AY02218A
Idioma: eng
Tipus: info:eu-repo/semantics/article
Drets: © The Royal Society of Chemistry 2015
Revisió científica: si
Versió de l'editor: http://dx.doi.org/10.1039/C4AY02218A
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