Screen-printed electrode based electrochemical detector coupled with ionic liquid dispersive liquid–liquid microextraction and microvolume back-extraction for determination of mercury in water samples
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Título: | Screen-printed electrode based electrochemical detector coupled with ionic liquid dispersive liquid–liquid microextraction and microvolume back-extraction for determination of mercury in water samples |
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Autor/es: | Fernández Martínez, Elena | Vidal, Lorena | Martín-Yerga, Daniel | Blanco, María del Carmen | Canals, Antonio | Costa-García, Agustín |
Grupo/s de investigación o GITE: | Espectroscopía Atómica-Masas y Química Analítica en Condiciones Extremas |
Centro, Departamento o Servicio: | Universidad de Alicante. Departamento de Química Analítica, Nutrición y Bromatología | Universidad de Alicante. Instituto Universitario de Materiales |
Palabras clave: | Liquid-phase microextraction | Dispersive liquid–liquid microextraction | Ionic liquid | Mercury | Screen-printed electrode | Water samples |
Área/s de conocimiento: | Química Analítica |
Fecha de publicación: | 1-abr-2015 |
Editor: | Elsevier |
Cita bibliográfica: | Talanta. 2015, 135: 34-40. doi:10.1016/j.talanta.2014.11.069 |
Resumen: | A novel approach is presented, whereby gold nanostructured screen-printed carbon electrodes (SPCnAuEs) are combined with in-situ ionic liquid formation dispersive liquid–liquid microextraction (in-situ IL-DLLME) and microvolume back-extraction for the determination of mercury in water samples. In-situ IL-DLLME is based on a simple metathesis reaction between a water-miscible IL and a salt to form a water-immiscible IL into sample solution. Mercury complex with ammonium pyrrolidinedithiocarbamate is extracted from sample solution into the water-immiscible IL formed in-situ. Then, an ultrasound-assisted procedure is employed to back-extract the mercury into 10 µL of a 4 M HCl aqueous solution, which is finally analyzed using SPCnAuEs. Sample preparation methodology was optimized using a multivariate optimization strategy. Under optimized conditions, a linear range between 0.5 and 10 µg L−1 was obtained with a correlation coefficient of 0.997 for six calibration points. The limit of detection obtained was 0.2 µg L−1, which is lower than the threshold value established by the Environmental Protection Agency and European Union (i.e., 2 µg L−1 and 1 µg L−1, respectively). The repeatability of the proposed method was evaluated at two different spiking levels (3 and 10 µg L−1) and a coefficient of variation of 13% was obtained in both cases. The performance of the proposed methodology was evaluated in real-world water samples including tap water, bottled water, river water and industrial wastewater. Relative recoveries between 95% and 108% were obtained. |
Patrocinador/es: | The authors would like to thank the Spanish Ministry of Science and Innovation (Project nos. CTQ2011-23968 and CTQ2011-24560), the Generalitat Valenciana (Spain) (Project nos. ACOMP/2013/072, PROMETEO/2013/038 and GV/2014/096) and the University of Alicante (Spain) (Project no. GRE12-45) for the financial support. E. Fernández and D. Martín-Yerga also thank Generalitat Valenciana and Ministry of Economy and Competitiveness, respectively, for their fellowships. |
URI: | http://hdl.handle.net/10045/44108 |
ISSN: | 0039-9140 (Print) | 1873-3573 (Online) |
DOI: | 10.1016/j.talanta.2014.11.069 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Revisión científica: | si |
Versión del editor: | http://dx.doi.org/10.1016/j.talanta.2014.11.069 |
Aparece en las colecciones: | INV - SP-BG - Artículos de Revistas |
Archivos en este ítem:
Archivo | Descripción | Tamaño | Formato | |
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2015_Fernandez_etal_Talanta_final.pdf | Versión final (acceso restringido) | 756,87 kB | Adobe PDF | Abrir Solicitar una copia |
2015_Fernandez_etal_Talanta.pdf | Accepted Manuscript (acceso abierto) | 756,05 kB | Adobe PDF | Abrir Vista previa |
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