Vanesa Romero

Vanesa Romero
University of Vigo | UVIGO · Department of Analytical and Food Chemistry

PhD Analytical Chemistry

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57
Publications
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1,061
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Publications

Publications (57)
Article
Herein, an ultrasound-assisted dispersive magnetic micro-solid phase extraction (DM-μSPE) approach, along with electrothermal atomic absorption spectrometry (ETAAS) for the determination of lead at trace level in spring, well, river mineral and tap water samples was developed. The extraction step is based on the synthesis of PbS, following the sono...
Article
Full-text available
Citation: Bendicho, C.; Lavilla, I.; Pena-Pereira, F.; la Calle, I.d.; Romero, V. Paper-Based Analytical Devices for Colorimetric and Luminescent Detection of Mercury in Waters: An Overview. Sensors 2021, 21, 7571. Abstract: Lab-on-paper technologies, also known as paper-based analytical devices (PADs), have received increasing attention in the la...
Article
In this work, a new analytical approach based on ultrasound-assisted dispersive (micro)solid phase extraction (US-D-μSPE) using TpBD-Me2 covalent organic framework (COF) as adsorbent for simple, rapid and selective fluorescent determination of two polycyclic synthetic fragrances in seawater, i.e., 1,3,4,6,7,8-hexahydro-4,6,6,7,8,8-hexamethyl-cyclop...
Article
Since its discovery in 2004, substantial efforts have been devoted to the use of graphene and graphene oxide (GO) in areas such as catalysis, clean energy devices, electronics, biomedicine and, particularly, as sorbents in sample preparation for both trace organic and inorganic analysis. In a step forward, in the last few years, a number of applica...
Article
Herein, we demonstrate, for the first time, that covalent organic frameworks (COFs) can be efficient adsorbents for the screening of pharmaceuticals in real water samples, obtaining highly representative data on their occurrence and avoiding the cost of carrying high volume samples and tedious and costly clean-up and preconcentration steps. Of the...
Article
Full-text available
The development of disposable sensors that can be easily adapted to every analytical problem is currently a hot topic that is revolutionizing many areas of science and technology. The need for decentralized analytical measurements at real time is increasing for solving problems in areas such as environment pollution, medical diagnostic, food qualit...
Article
Full-text available
In the recent years, composite materials containing covalent organic frameworks (COFs) have raised increasing interest for analytical applications. To date, various synthesis techniques have emerged that allow for the preparation of crystalline and porous COF composites with various materials. Herein, we summarize the most common methods used to ga...
Article
A magnetic covalent organic framework (COF) is applied for the first time as adsorbent for the extraction of endocrine-disrupting pesticides from water. High adsorption efficiencies were found for lipophilic chlorpyrifos and atrazine, with calculated maximum adsorption capacities of 270 mg g⁻¹ and 54 mg g⁻¹, respectively, outperforming reported ads...
Article
Total Reflection X-Ray Fluorescence spectrometry (TXRF) provides many advantages for metal and metalloid analysis. In general, the sample should be prepared as a thin film. To that end, for the analysis of liquid, suspensions or solids previously digested, a small aliquot of the sample is dropped on the sample carrier (e.g. quartz reflector). Howev...
Article
Covalent organic frameworks (COFs) show great promise for application in the capture of contaminants from water due to their high surface area, uniform pore size, and high chemical stability. Recent advances in the synthesis of water‐stable COF derivatives as well as strategies to obtain highly crystalline and porous materials can be exploited to g...
Article
Full-text available
A novel procedure for the preparation of magnetic covalent organic frameworks (COFs) is reported. In situ functionalization of Fe3O4 with dopamine rapidly afforded amino-functionalized magnetic nanoparticles, which after decoration with a COF building block and subsequent COF growth gave access to magnetic composite mTpBD-Me2. The optimized synthes...
Article
Covalent organic frameworks (COFs) are attractive materials receiving increasing interest in the literature due to their crystallinity, large surface area, and pore uniformity. Their properties can be tailored towards specific applications by judicious design of COF building blocks, giving access to tailor‐made pore sizes and surfaces. In this conc...
Chapter
Se presenta el desarrollo de un seminario pensado para captar la atención de los alumnos de Química Analítica. Para ello se seleccionó como tema los envenenamientos por arsénico y la determinación de este elemento. Se plantearon tres cuestiones básicas: el arsénico como veneno, la historia del método de Marsh y la evolución de dicho método. Los alu...
Article
In this work, a novel one–step ‘bottom–up’ synthetic approach is described for obtaining highly fluorescent nitrogen (N) and sulphur (S) co–doped carbon dots (CDs) following photochemical oxidation of carbohydrates naturally occurring in vegetables. N and S co–doping allows more active sites in the CDs surface resulting in an enhancement of their l...
Article
In this work, a guided-inquiry laboratory experiment that introduces the use of nanotechnology with analytical purposes in the curriculum of undergraduate students is proposed. A published laboratory procedure was used as the basis for implementing the experiment with different levels of inquiry. This involves the use of magnetite nanoparticles for...
Article
In this work, a novel analytical approach for speciation of inorganic As (iAs) and inorganic Sb (iSb) by total reflection X-ray fluorescence based on the selective generation of arsine and stibine followed by trapping onto quartz reflectors containing immobilized palladium nanoparticles (Pd NPs) is developed. Pd NPs were synthesized by chemical red...
Article
In this work, a new analytical approach based on in situ ultrasound-assisted preparation of manganese dioxide coated magnetite nanoparticles (Fe3O4@MnO2 NPs) was applied for extraction and preconcentration of Ni, Cu, Zn, Tl, Pb, Bi and Se. The Fe3O4@MnO2 core-shell nanocomposite was synthesized by application of high-intensity sonication to an aque...
Article
In this work, a rapid and simple analytical method for the quality control of iodized salt based on simultaneous ultrasound-assisted iodide oxidation and liquid-liquid microextraction, with the subsequent measurement of the organic phase by UV–vis micro-spectrophotometry is described. An aqueous sample solution along with 50 μL of carbon tetrachlor...
Chapter
En este trabajo se presenta un proyecto experimental pensado para alumnos de química medioambiental, en el que se propone utilizar nanopartículas, base de la nanotecnología actual, para abordar un problema de interés general como es la deficiente eliminación de elementos tóxicos del medio acuático. Concretamente, se propone la utilización de nanopa...
Article
In this work, a fast and miniaturised procedure based on the use of a natural deep eutectic solvent (NADES) in combination with ultrasound-assisted extraction (UAE) has been proposed for gluten determination by a commercial enzyme-linked immunosorbent assay (ELISA). Fourteen NADESs were prepared by combining two natural primary metabolites and wate...
Article
In this work, a novel analytical approach for determining methyl(cyclopentadienyl)-tricarbonyl (MMT) by total reflection X-ray fluorescence (TXRF) based on its trapping onto unmodified graphene membranes is described. Graphene membranes were synthesized by mild-thermal reduction of graphene oxide following drop-casting onto a glass substrate. High...
Article
Introduction: Pulmonary hypertension (PH) is a serious complication in connective tissue disease (CTD), although multiple causes can be the source of it. Therefore, it is essential to establish an accurate diagnosis to determine the cause of HP. Early detection algorithms are aimed to diagnose PH in patients with CTD in less advanced disease. Objec...
Article
Fabrication of unmodified graphene membranes for their application as selective sorptive platforms of hexavalent chromium [Cr(VI)] is described for the first time. Multilayer graphene membranes are synthesized by drop-casting of graphene oxide (GO) onto a glass substrate followed by mild thermal reduction. As-prepared membranes are formatted to fit...
Article
We describe a method for ultrasensitive detection of mercury (Hg) by total reflection X-ray fluorescence following photogeneration of Hg vapor and trapping onto quartz substrates coated with nanostructured palladium. The nanostructured coating was characterized by transmission electron microscopy. Hg vapor was generated by online photo-UV reduction...
Article
A new synthesis approach for obtaining fluorescent carbon dots (CDs) based on UV irradiation of carbohydrates was developed. The photochemical synthesis pathway allows the formation of water soluble CDs of analytical usefulness within one min. CDs obtained by photochemical treatment from the sucrose/NaOH/poly(ethylene glycol) system are monodispers...
Conference Paper
Full-text available
1. Objectives Immobilization of surfactant-free noble metal nanoparticles (NPs) on quartz substrates could provide new avenues for the development of solid phase microextraction in combination with total reflection X-ray fluorescence (TXRF). The use of immobilized NPs allows the direct trapping of volatile analytes onto sample carriers without the...
Conference Paper
1. Objectives In this work, integration of synthesis and sensing processes is proposed as a novel strategy for the development of rapid assays based on carbon dots (CDs). Different green pathways were used in order to build in situ integrated systems including sonochemical and photochemical treatments. The sonochemistry-based system allows to detec...
Conference Paper
Dissolved reactive phosphorus (DRP) is considered the fraction of phosphorus that contributes the most to the eutrophication of surface waters [1]. DRP refers to the fraction of phosphorus that responds to chemical reactions without previous hydrolysis or oxidation after filtration through 0.45 μm membrane filters. An analytical methodology for the...
Conference Paper
In the last years, a great interest has arisen on new chemiluminescent systems due to the attractive properties of chemiluminescence-based assays such as high sensitivity, wide linear range and simple instrumentation required. In this sense, different nanomaterials have been tried as chemiluminescence (CL) emitters including metal and semiconductor...
Conference Paper
Total reflection X-ray fluorescence is an emerging technique that allows performing mutielement determinations at trace level using microsamples deposited onto a smooth surface. Evaluation of metal mobility and bioavailability from soils has been extensively addressed using a variety of operational approaches. In this work, a portable TXRF spectrom...
Article
Full-text available
Carbon dots (CDs) are a recently discovered class of fluorescent nanomaterials with great potential to be applied in the analytical field. CDs have demonstrated to be a promising alternative to conventional organic fluorophores or quantum dots as optical nano-probes for sensing different chemical species. In this overview, we review the progress in...
Article
Nanostructured materials play roles in different areas of analytical chemistry. Implementation of nanomaterials in liquid-phase microextraction results in a synergic combination yielding enhanced performance. Some significant examples include: carbon nanotubes for improving extraction efficiency; magnetic nanoparticles for retrieval ionic liquids o...
Article
In this work, a novel method for determining Sb and Bi based on the trapping of their covalent hydrides onto quartz reflectors coated with immobilized palladium nanoparticles (Pd NPs) followed by total reflection X-ray fluorescence (TXRF) analysis is proposed. Pd NPs were synthesized by chemical reduction of the metal precursor using a mixture of w...
Conference Paper
In this work, fluorescent quantum dots (QDs) and gold nanoclusters (Au NCs) are confined in a drop to develop a novel sensing platform for metal ions and organometals at trace level (detection limits in the range of micro-to-nano molar). A portable micro-fluorospectrometer was employed for fluorescence measurement. CdSe and core-shell CdSe/ZnS QDs...
Conference Paper
In the last years there has been a great interest towards the development of optical nanosensors. To this end, fluorescent nanomaterials have been implemented in analytical systems for the detection of toxic metal species. Recently, fluorescent carbon dots (CDs) have received much attention due to their attractive properties such as strong fluoresc...
Article
In this work, a simple route for the synthesis of surfactant-free immobilized palladium nanoparticles (Pd NPs) and their use as effective nanocatalysts for metal hydride decomposition is described. A mixture of ethanol:water was used as reducing agent. Ethanol was added in a large excess to reduce the ionic Pd and stabilize the obtained Pd NPs. Eth...
Article
In this work, a new method based on dispersive magnetic micro-solid phase extraction (DM-μ-SPE) of Cd prior to its determination by electrothermal atomic absorption spectrometry (ETAAS) is described. The method is based on the co-precipitation of Cd at part-per-trillon level onto freshly prepared Fe3O4 nanoparticles by applying high intensity sonic...
Article
Principle 8 of Green Chemistry recommends eliminating derivatization, yet it is difficult to fulfill in analytical chemistry, so we consider the design of environment-friendly derivatization procedures in this article. We provide an overview on the main strategies for achieving greener derivatization procedures, emphasizing the use of less hazardou...
Article
Systems based on quantum dots (QDs) have received great attention in recent years in the field of analytical chemistry for the detection of a variety of analytes. In this overview, we review novel methods based on the employment of QDs for inorganic-trace analysis, making use of liquid-phase and solid-phase systems, reversible and even visual and m...
Article
A new fluorescent assay based on in situ ultrasound-assisted synthesis of carbon dots (CDs) as optical nanoprobes for the detection of methylmercury has been developed. Application of high intensity sonication allows performing simultaneously the synthesis of fluorescent CDs within the analytical time scale and the selective recognition of the targ...
Article
In this work, a new analytical approach based on the trapping of Se and Hg vapours using silver nanoparticles (Ag NPs) immobilized on quartz reflectors, prior to their determination by total reflection X-ray fluorescence (TXRF), is proposed. Ag NPs were synthesized by reduction of the metal precursor with a reducing agent in aqueous solution. Silan...
Article
In the last years, there has been a revival of total reflection X-ray fluorescence spectrometry (TXRF), which was firstly applied for analytical purposes in the late 80s. The aim of this work is to discuss and compare the current approaches for sample pretreatment including in situ microdigestion, slurry preparation, acid digestion, extraction, etc...
Article
In this work, in situ ultrasound-assisted magnetite synthesis with simultaneous ion co-precipitation (UAMSSIC) was applied to magnetic solid-phase extraction (MSPE) of Cu, Zn, Ge, As, Se, Re, Au, Hg, Tl, Bi and Pb. The magnetic solid phase (MSP) enriched with metal ions was directly analyzed by total reflection X-ray fluorescence (TXRF). Magnetite...
Article
Full-text available
As a result of the greater consciousness within the analytical community on the impact of chemicals on human health and environment, green issues are increasingly taken into account when choosing an established analytical method or developing a new one. Apart from typical analytical characteristics (e.g., sensitivity, limit of detection, repeatabil...
Article
Following a preliminary work (Costas-Mora, I.; Romero, V.; Pena-Pereira, F.; Lavilla, I.; Bendicho, C. Anal. Chem.2011, 83, 2388-2393), a quenching mechanism has been established for the selective detection of Se (as selenium hydride) by microfluorospectrometry using CdSe quantum dots (QDs) as luminescent probes stabilized with hexadecylamine and c...
Article
Full-text available
As a result of the greater consciousness within the analytical community on the impact of chemicals on human health and environment, green issues are increasingly taken into account when choosing an established analytical method or developing a new one. Apart from typical analytical characteristics (e.g., sensitivity, limit of detection, repeatabil...
Article
UV-Vis spectrometry has become a widespread analytical technique due to its inherent features (e.g., simplicity, ease of operation, convenience and economy). The necessity to decrease the consumption of valuable and scarce samples, together with the application of novel sample-retention technologies, the improvement of materials and the development...
Article
A miniaturized method based on liquid-phase microextraction (LPME) in combination with microvolume UV-vis spectrophotometry for monitoring ammonia in waters is proposed. The methodology is based on the extraction of the ion pair formed between the blue indophenol obtained according to the Berthelot reaction and a quaternary ammonium salt into a mic...
Article
In this work, different Pd-based substrates (i.e. Pd wire, Pd-coated stainless steel wire and Pd-coated SiO2) are tried for microextraction of Hg prior to its release into a modified quartz T-cell so as to develop a costeffective, sensitive and easy-to-handle coupling between solid-phase microextraction (SPME) and atomic absorption spectrometry. Th...
Article
Core-shell CdSe/ZnS quantum dots (QDs) dispersed in a droplet of organic solvent have been applied for the first time as luminescent probes for the selective detection of volatile species. Luminescence quenching caused by volatile species was examined after their trapping onto a drop using the headspace single-drop microextraction (HS-SDME) approac...

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