Search results for "it-spme"
showing 6 items of 6 documents
Desarrollo de estrategías analíticas para la identificación de contaminantes emergentes
2015
En la presente Tesis, se han desarrollado diferentes métodos para identificar la presencia de contaminantes procedentes de diferentes fuentes naturales. Los métodos desarrollados han sido abordados utilizando dos metodologías: (i) IT-SPME acoplado a CapLC y UHPLC con detección DAD y MS, y (ii) dispositivos de análisis in situ. La estrategia basada en el acoplamiento entre IT-SPME y CapLC y UHPLC se ha utilizado para la estimación de la presencia de contaminantes (pesticidas como triazinas, nitroanilina, fenilureas y organofosforados, y plastificantes como productos de degradación del DEHP y principalmente DEHP) en muestras de aguas superficiales, de aguas de depuradoras, biota y sedimentos.…
Analysis of Contact Traces of Cannabis by In-Tube Solid-Phase Microextraction Coupled to Nanoliquid Chromatography
2018
Because of its inherent qualities, in-tube solid-phase microextraction (IT-SPME) coupled on-line to nanoliquid chromatography (nanoLC) can be a very powerful tool to address the new challenges of analytical laboratories such as the analysis of traces of complex samples. This is the case of the detection of contact traces of drugs, especially cannabis. The main difficulties encountered in the analysis of traces of cannabis plants on surfaces are the low amount of sample available (typically <
Improving the On-Line Extraction of Polar Compounds by IT-SPME with Silica Nanoparticles Modified Phases
2018
In the present work the extraction efficiency of in-tube solid-phase microextraction (IT-SPME) for polar herbicides has been evaluated using extractive capillaries coated with different polymeric sorbents. For this purpose, aqueous solutions of herbicides with a wide range of polarities, including some highly polar compounds (log Kow < 1), have been directly processed by IT-SPME coupled on-line to capillary liquid chromatography with UV-diode array detection. For extraction, commercially available capillary columns coated with polydimethylsiloxane (PDMS) and polyetilenglicol (PEG)-based phases have been used, and the results have been compared with those obtained with a synthesized tetra…
Miniaturized liquid chromatography: on‐line coupling to in‐tube solid phase microextraction and portability for different matrices
2020
Recent innovations and trends in analytical chemistry lead to the development and application of new instrumental systems, innovative sample treatment techniques, and application to problem solving in various fields of analysis. Likewise, the growing concern about the reduction of the environmental impact during the analytical process, without impairing benefits in terms of selectivity and sensitivity, have modulated the main topics in this field of research. In this context, the continuous application of miniaturized liquid chromatography (LC) systems, including capillary liquid chromatography (CapLC) and nano liquid chromatography (NanoLC), has represented important advances, due to their…
Desarrollo de nuevas estrategias para el diseño de técnicas de cromatografía líquida miniaturizada en línea: nanopartículas, contaminación secundaria
2019
In recent years one of the most important trends in Analytical Chemistry has been the development of new analytical methodologies based on the miniaturization, simplification and automatization of the analytical process, in order to reduce the environmental impact of the analysis without compromising the sensitivity and selectivity. In this respect miniaturized liquid chromatography (LC) systems, such as capillary liquid chromatography (CapLC) and nanoliquid chromatography (NanoLC) are important achievements. These techniques are environmental friendly because the amount of material involved is limited and organic solvents, electricity and the wastes generated are lower than in conventional…
New strategies for improving the sustainability of analytical methods in different matrices
2021
El concepto “sostenible” apareció en los años 70 con el objetivo de relacionar el desarrollo económico y la conservación de los ecosistemas. La palabra sostenibilidad se debe al informe Brundland realizado en 1987 en el marco de la Comisión de las Naciones Unidas para el Medio Ambiente. Este informe advirtió sobre las consecuencias ambientales negativas del desarrollo económico y la globalización, tratando de ofrecer soluciones a los problemas derivados del crecimiento demográfico y la industrialización. Particularizando en la Química, el calificativo sostenible aporta un enfoque holístico, que establece políticas y objetivos medibles para un proceso continuo de mejora. En este contexto, la…