Mauricio Llaver

Bio: Mauricio Llaver is an academic researcher from Facultad de Ciencias Exactas y Naturales. The author has contributed to research in topics: Ionic liquid & Detection limit. The author has an hindex of 6, co-authored 12 publications receiving 104 citations. Previous affiliations of Mauricio Llaver include National University of Cuyo.

Synergistic analytical preconcentration with ionic liquid–nanomaterial hybrids

Abstract: Nanomaterials and ionic liquids (ILs) have very attractive properties for improved analytical preconcentration methods. Thus, ILs have been used as excellent tools to functionalize nanomaterials, giving them specific chemical properties for higher selectivity, extraction efficiency and extended re-utilization in preconcentration. Moreover, incorporation of IL-nanomaterial hybrids in miniaturized solid phase and liquid phase microextraction procedures is being increasingly exploited to obtain high analytical recoveries while developing environmentally friendly analytical methods. In this review, the design and application of innovative and efficient analytical methods for sensitive and selective determination of inorganic and organic analytes is described. The synthesis of some IL-nanomaterial hybrids is presented along with a revision of the most important synergistic physicochemical properties useful for the extraction of analytes. Finally, practical considerations concerning the application of IL-nanomaterial hybrids for the development of modern analytical separation and preconcentration techniques are fully discussed in this work.

Fabrications of novel solid phase microextraction fiber coatings based on new materials for high enrichment capability

Abstract: Enrichments of emerging pollutants and drugs from various samples with complex matrices make it urgent and challenging to develop novel SPME coatings, and the flourishing materials with high enrichment capabilities provide good opportunities for it. This review summarizes the used materials for the fabrication of SPME coatings in the past five years, including carbon, polymer, metal organic frameworks (MOFs), covalent organic frameworks (COFs), ionic liquids (ILs), metal/metal oxide nanoparticles and silica. To obtain SPME coatings with excellent physical performance, anti-interference ability and high enrichment capability, suitable coating methods and supports are selected according to the properties of coating materials. In addition, the factors of coating materials and analytes influencing the enrichment effect are summarized and illustrated preliminarily, benefiting for further design of advanced coating materials with enhanced performance.

Dispersive solid phase microextraction

Abstract: Dispersive solid phase microextraction (DSPME) as a prepossessing solid phase microextraction (SPME) technique has been recently considered for the extraction, clean up, and preconcentration of different analytes in real samples. In this review, the advantages and disadvantages of DSPME against SPME are compared based on the practical procedure and their applications. Theory of DSPME is studied to determine the effective factors in the extraction recovery of analytes. Types of DSPME procedure, method limitations, and extensions are discussed to remove these constraints. Moreover, sorbent dispersion procedures in the sample solution and sorbent separation methods from the sample solution are also reviewed and compared.

Original Paper Speciation of inorganic tellurium from seawater by ICP-MS following magnetic SPE separation and preconcentration

Abstract: A new method was developed for the speciation of inorganic tellurium species inseawater by inductively coupled plasma-MS (ICP-MS) following selective magneticSPE (MSPE) separation. Within the pH range of 2–9, tellurite (Te(IV)) could be quanti-tatively adsorbed on c-mercaptopropyltrimethoxysilane (c-MPTMS) modified silica-coated magnetic nanoparticles (MNPs), while the tellurate (Te(VI)) was not retainedand remained in solution. Without filtration or centrifugation, these tellurite-loaded MNPs could be separated easily from the aqueous solution by simply apply-ing external magnetic field. The Te(IV) adsorbed on the MNPs could be recoveredquantitatively using a solution containing 2 mol/L HCl and 0.03 mol/L K