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Publications (84)
In Mendoza, viticulture is increasingly expanding into mountainous regions, taking advantage of cooler temperatures. High-altitude vineyards, characterized by greater soil heterogeneity, can significantly impact grapevine growth, development, elemental uptake, and wine sensory attributes. Despite its relevance, the effects of intra-vineyard variabi...
In this work the assessment of two genetic technologies, as well as an elementomic analysis was performed in maize based on elemental analysis of leaves and grains tissues. Leaf and grains of maize were mineralized in a microwave oven and analysed by microwave induced plasma optical emission spectroscopy (MPAES) for the quantification of eleven ele...
A flow injection system including hydride generation was coupled to an atomic absorption spectrometer (FI-HG-AAS) and was used for the on-line precon-centration and subsequent determination of selenium and tellurium. Trace amounts of both elements were on-line precon-centrated by coprecipitation with La(OH) 3 and adsorbed later on a minicolumn pack...
El material lítico es el elemento de mayor abundancia en los registros arqueológicos de Sierras Centrales y sus llanuras adyacentes. Los estudios realizados sobre el mismo utilizan diferentes escalas espaciales, metodologías de campo y laboratorio. Sin embargo, los programas de investigación orientados a la detección de fuentes de aprovisionamiento...
Background
The elemental composition of maize grains depends on the soil, land and environment characteristics where the crop grows. These effects are important to evaluate the availability of nutrients whose dynamic is complex, such as concentration of macro and micronutrients in soils, which can vary according to different topographies in next ar...
The identification of heavy metals in the atmosphere has increased a strong and growing interest. Thereby, monitoring of elements in aerobiological samples could be a powerful tool for detection of environmental pollution. In this work, a simple and fast method for the determination of trace metals bound to aeroparticles such as pollen was optimize...
Traceability of food has become an important issue. In particular, the traceability of natural products has become an important topic considering the high number of possible sources of environmental pollutants which these products are exposed during the production process. Chemical composition and organoleptic characteristics of honey are strongly...
Groundwater with high arsenic (As) concentration constitutes a serious problem for crops, since roots can accumulate the metalloid acting as the first stage of As distribution in the trophic chain. The aim of this research was to elucidate the impact of a realistic As(V) dose in peanut and maize plants and to determine the contribution of plant gro...
A rigorous evaluation of environmental contamination requires constant innovation in analytical approaches to gain early identification and accurate quantification of every substance able to compromise health and well-being, particularly when trace analysis of organic and inorganic contaminants, and their species, in complex environmental samples i...
Las Cañas Plutonic Complex (LCPC) is a small representative of the Famatinian Ordovician plutonism (470.4 ± 8.1 Ma) located in the northeastern sector of Sierra Grande de San Luis, Argentina. The LCPC was emplaced into a metasedimentary sequence, which reached their metamorphic climax under high-temperature/low-pressure conditions (~680 ± 37 °C and...
In this work the effects produced by two treatments on maize crop samples have been studied. Analysis of maize grain based on two types of agronomical conditions was performed on: (a) lots treated with different fertilizers and (b) lots with different crop density. Analysis was carried out by microwave induced plasma with optical emission spectrome...
The acid mine drainage that originates in the abandoned gold mine in San Luis, Argentina, is released into La Carolina stream. The aim of this study was to determine the influence of this mine drainage on the physicochemical parameters of the area studied and on both prokaryotic and eukaryotic community structure. In addition, specific relationship...
A hyphenated system was developed for Hg(II) and methylmercury (MeHg) preconcentration and speciation analysis by the online coupling of solid phase extraction (SPE), high performance liquid chromatography (HPLC) and inductively coupled plasma mass spectrometry (ICP-MS). Both analytes, Hg(II) and MeHg, were preconcentrated on a microcolumn filled w...
Arsenic (As) in the environment is an increasing problem all over the world that limits crop yield, and therefore, remediation strategies like inoculation with plant growth promoting rhizobacteria (PGPR) are necessary. The objective of the current study was to assess PGPR ability to reduce AsIII toxicity in grapevine (Vitis vinifera L. cv. Malbec)....
Levels of essential metals in human breast milk (HBM) have been determined by different analytical techniques, but there is few woks about human whey milk fractions. However, the current trend lies in metalloproteomic and identification of different metalloproteins. In this sense, native separative techniques (N-PAGE and SEC) coupled to ICP-MS prov...
Diabetes and hypothyroidism are both metabolic diseases with great incidence worldwide. Metalloproteins and metals play key roles in normal glucose metabolism and thyroid hormone synthesis, which are altered in their respective pathologies. The aim of this work was to establish the corresponding multielemental and metalloprotean profiles in a contr...
Contamination by trace elements (TE) is an increasing concern worldwide. In some areas, crop production could be limited by the presence of metals and metalloids, so it is important to determine their concentrations and mobility. The region of Jáchal, province of San Juan, Argentina, has good growing conditions for onion and grapevine production, b...
A new green on-line method for Boldine determination (BOL) in herbal drugs and phytopharmaceuticals, using its native fluorescence in acid media (λex = 282 nm; λem = 373 nm) has been developed. The presented methodology involves for the first time, a flow injection (FI) strategy using a mini-column of multiwalled carbon nanotubes as retention agent...
A systematic study was undertaken to optimize a method to determine S, Cl, Br and I in water by high resolution inductively coupled plasma mass spectrometry (HR-ICP-MS). The sample composition and preparation conditions (the total dissolved solids -TDS-, the total organic compounds -TOC- and the addition of nitric acid) were evaluated to assess the...
A high performance liquid chromatography coupled (HPLC) with molecular fluorescence (MF) spectrometry method for determination of thimerosal (sodium ethylmercurythiosalicylate, C9 H9 HgNaO2 S), and derivatives is proposed. A sensitization of molecular fluorescence was provoked by UV irradiation of analytes in a home-made photoreactor that served as...
The role of trace elements bound to proteins in the etiology and pathogenesis of rheumatoid arthritis (RA) remains unclear. In this sense, the identification and detection of metalloproteins has a strong and growing interest. Metalloprotein studies are currently carried out by polyacrylamide gel electrophoresis (PAGE) associated to inductively coup...
A method to verify the differentiating characteristics of milk-based infant formula is proposed in this work. In order to evaluate a classification of the milks according to their nutritional profile, the concentration of 24 elements were determinated. Supervised methods PCA-LDA, PLS-DA, and SIMCA were contrasted. PCA-LDA and SIMCA provided signifi...
ICP-MS methods, and its variants, had been extensively used to determine REEs due to their lower detection limits, high sensitivity and dynamic linear range. However, spectral interferences caused by oxide and hydroxide ions always represents an issue regardless the type of sample been dealt. In the present work it was described the study of REEs o...
Today there is a growing interest in improving air quality and thus it has prompted an important increase in atmospheric pollution research. This complex task requires knowledge of all the factors and processes involved, such as the emission of pollutants to the atmosphere by natural and/or anthropogenic sources, including catastrophic accidents, t...
In this work, a rapid and simple ultrasound-assisted pretreatment for maize samples is proposed. Also, the performance of microwave plasma atomic emission spectrometry (MPAES) for the analysis of Ag, Al, Ba, Be, Ca, Cd, Co, Cr, Cu, Fe, Mg, Mn, Mo, Na, Ni, Pb, Tl, V and Zn in maize seeds, was evaluated. Instrumental parameters optimization, as well...
Nanoporous carbon (NPC) prepared from metal organic frameworks (MOFs) was studied to serve as a sorbent for preconcentrating Sb(III) at trace levels. The performance of NPC regarding sensitivity, enrichment factor, analytical throughput and recovery was compared with that of multiwalled carbon nanotubes functionalised with L–proline (pro–MWCNTs). I...
An analytical method has been developed to determine seleno-amino acids in proteins extracted from extra virgin olive oils (EVOOs). Different aqueous/organic solvents were tested to isolate proteins, an acetone:n-hexane combination being the best protein precipitant. In a first dimension chromatography, extracted proteins were analysed by size excl...
Lead traces were preconcentrated on paper filter discs using the coacervation phenomenon based on cationic and anionic surfactant reaction at room temperature. The increase in fluorescent signal of Rhodamine B dye was used for metal quantification by solid surface fluorescence. Experimental variables that influence on preconcentration step and fluo...
A novel, simple, and rapid method is presented for the determination of B, Cl, Ga, Ge, As, Br, Se, Sn, Sb, I, Te, Pb, and Bi in vegetable oil samples by induc- tively coupled plasma mass spec- trometry (ICP-MS) after sample solubilization with tetrabutylam- monium hydroxide (TBAH) in an ultrasonic bath. Sample introduc- tion was accomplished after...
Foods are an extremely diverse group of products that are often supplemented with additional items and sometimes contaminated with harmful substances. The concept of food analysis has grown in complexity as a result of international regulations and legislation, consumer demand, and globalization of the food market. Thus it has become an absolutely...
A high performance liquid chromatography coupled with atomic fluorescence spectrometry method for the determination of thimerosal (sodium ethylmercury thiosalicylate, C9H9HgNaO2S), ethylmercury, and inorganic mercury is proposed. Mercury vapor is generated by the post-column reduction of mercury species in formic acid media using UV-radiation. Thim...
Inductively coupled plasma mass spectrometry instrumentation along with the dynamic reaction cell (DRC) technology has been increasingly used in the last decade for multielemental analysis of biological samples. This work reports the development of a method to assess concentrations of Li, Be, B, Sc, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, As, Se, Rb, Cd, S...
Honey bees are the main pollinators of onion crops for seed production, but owing to low attractiveness of flowers, pollination is often inadequate. Pollination problems result in low seed yields. This problem is accentuated when male sterile lines (MSL) are used to produce hybrid onion seeds. In this study, the effect of floral attributes and nect...
The concentrations of trace elements in biological samples are far below those achieved directly by most atomic or plasma-based techniques and the detection power needs to be improved by the use of a preconcentration step. In this connection, solid phase extraction (SPE) makes possible the concentration and purification of analytes from solution by...
Arsenic determination in natural waters is an issue of current research. This article reports a novel hydride generation (HG) approach developed for As determination with electrothermal atomic absorption spectrometry (ETAAS) detection. The HG process was interfaced with ETAAS through hydride trapping onto a carbon nanotubes microcolumn. To this end...
Thiswork presents a sensitive and accurate method for Cd determination in serumprotein fractions separated by cellulose acetate electrophoresis (CAE). The determinations were carried out by on-line solid phase extraction using oxidized carbon nanotubes coupled to electrothermal atomization atomic absorption spectrometry (ETAAS). The detection and q...
Multiwalled carbon nanotubes are evaluated here as solid phase extraction (SPE) sorbent aiming to (±)-chlorpheniramine (CPA) enantioresolution with fluorimetric detection. β-cyclodextrin (CD) was added to the racemate and solutions with HCl and sodium dodecyl sulfate (SDS) in different proportions were assayed as eluents to achieve the separation b...
A novel method for analysis of biodiesel by electrothermal atomic absorption spectrometry is described. This analytical strategy involves sample preparation as emulsions for routine and reliable determination of Cd and Hg. Several experimental conditions were investigated, including emulsion stability and composition, furnace temperature program an...
A novel flow injection (FI) system for chemical oxygen demand (COD) determination is evaluated. Manganese (VII) is used as oxidant. FI microwave solid phase extraction system by activated carbon (AC) was employed. FI system involves a digestion circuit, placed in a home MW oven, coupled to inductively coupled plasma-optical emission spectrometry. M...
The present paper evaluates the applicability of a new FIA system for COD determination. The new system, flow injection microwave solid phase extraction by means of activated carbon (FI-MW-SPE), consists of a digestion circuit, placed in a home MW oven, coupled to an ICP-OES spectrophotometer. Doehlert experimental design was used to speed up the o...
A fast method for the determination of As, Co, Cu, Fe, Mn, Ni, Se and V in biological samples by ETV-ICP-MS, after a simple sample treatment with formic acid, is proposed. Approximately 75 mg of each sample is mixed with 5 mL of formic acid, kept at 90°C for 1 h and then diluted with nitric acid aqueous solution to a 5% (v/v) formic acid and 1% (v/...
A method to obtain robust information on short term leaching behaviour of volcanic ashes has been developed independently on the sample age. A mixed factorial design (MFD) was employed as a multivariate strategy for the evaluation of the effects of selected control factors and their interactions (amount of sample (A), contact time (B), and liquid t...
[EN]The ash associated with explosive volcanism provides nutrients but also potentially toxic trace elements to the biogeochemical cycles on both continental and oceanic scale. We have developed and innovated several analytical protocols for assessment of these contributions on ashes from different eruptions in the American Southern Cone. The geoch...
Biosorption is a term that usually describes the removal of heavy metals from an aqueous solution through their passive binding to a biomass. Bacteria, yeast, algae and fungi are microorganisms that have been immobilized and employed as sorbents in biosorption processes. The binding characteristics of microorganisms are attributed to functional gro...
A study about the capabilities of three kinds of nanomaterials namely, carbon nanotubes (CNT), oxidized carbon nanotubes (ox-CNT) and l-alanine immobilized on carbon nanotubes (ala-CNT) to serve as sorbents for preconcentrating Ni and Pb using an on-line system coupled to electrothermal atomic absorption spectroscopy (ETAAS) technique, was accompli...
A research was performed to evaluate the capabilities of carbon nanotubes (CNTs) and modified CNTs to serve as sorbents for preconcentrating Cd together with on-line ultrasonic nebulization (USN)-inductively coupled plasma optical emission spectrometry (ICPOES). Three different carbon nanotubes sustrates namely, carbon nanotubes (CNTs), oxidized-ca...
A simple and fast method for the determination of As, Ba, Cd, Co, Cu, Fe, Ga, Mn, Mo, Ni, Pb, Rb, Se, Sr, Tl, U, V and Zn in biological samples by inductively coupled plasma mass spectrometry (ICP-MS), after sample solubilization with formic acid and introduction by a microconcentric nebulizer, is proposed. The sample is mixed with formic acid, kep...
A study is undertaken to monitor Pb levels in airborne particulate matter collected on ash-free glass-fibre filters from urban and industrial areas of Argentina by electrothermal atomic absorption spectrometry with self-reversal background correction. For this sample with a heavy matrix of silicon, a simple acid treatment with aqua regia and HF is...
A study was undertaken to assess the level of selected trace elements namely, As, Bi, Sb and Se in airborne particulate matter collected on ash-free glass-fibre filters from urban and industrial areas of Argentina. For sample digestion, a simple acid treatment with HCl + HF is proposed with the aim to minimize contamination and reduce sample treatm...
An interference-free, fast, and simple method is proposed for Pb determination in environmental solid samples combining slurry sampling and electrothermal atomic absorption spectrometry. Samples were ground to an adequate particle size and slurries were prepared by weighing from 0.05 g to 0.20 g of dry sediment, adding nitric acid, and a solution c...
A novel method for the determination of Pb by on-line cloud point extraction coupled to inductively coupled plasma optical emission spectrometry with ultrasonic nebulization (USN–ICP OES) is presented. The cloud point system was formed in the presence of non-ionic micelles of polyethyleneglycolmono-p-nonylphenylether (PONPE 7.5) and was retained in...
The enrichment ability of carbon nanotubes (CNTs) was investigated and a new method established for the determination of trace
thallium species in environmental samples using electrothermal atomization-atomic absorption spectrometry (ETAAS). The CNTs
were employed as sorbent substrate in a continuous flow system coupled to ETAAS. Parameters influen...
An approach for the separation and determination of inorganic thallium species is described. A new sorbent, L-tyrosine-carbon nanotubes (L-tyr-CNTs), was used and applied to the analysis of tap water samples. At pH 5.0, L-tyr was selective only towards Tl(III), while total thallium was determined directly by stabilized temperature platform furnace-...
An automated procedure for total and inorganic mercury determination in biodiesel by CV-AFS was studied. The samples were introduced directly as oil-in-water emulsions in a flow injection manifold followed by cold vapor generation coupled to atomic fluorescence spectrometry (FI-CV-AFS). After irradiation with an UV source, organic mercury (e.g. MeH...
A non-specific on-line method is presented for the extraction and preconcentration of two rare earth elements using a microcartridge containing C(18)-derivatized silica particles prior to their analysis by CZE. The microcartridge, named analyte concentrator, was coupled on-line to the inlet of the separation capillary (fused-silica (FS) capillary,...
Cloud point extraction (CPE) has been used for the preconcentration of cadmium, after the formation of a complex with 2-(5-bromo-2-pyridylazo)-5-(diethylamino)-phenol (5-Br-PADAP), and further determination by graphite furnace atomic absorption spectrometry (ETAAS) using polyethyleneglicolmono-p-nonyphenylether (PONPE 7.5) as surfactant. The chemic...
A novel method for cobalt preconcentration by cloud point extraction with on-line phase separation in a PTFE knotted reactor and further determination by electrothermal atomic absorption spectrometry (ETAAS) is proposed. The cloud point system was formed in the presence of non-ionic micelles of polyethyleneglycolmono-p-nonylphenylether (PONPE 7.5)...
Aluminium is an element found in biological samples at low concentrations and aluminum-related neuropathological diseases in human beings have been reported. For this reason the determination of Al in this type of samples requires the development of enrichment methods capable of improving the instrumental detection for this analyte.l-methionine imm...
Thirty two samples of natural honey produced in the province of La Pampa (Argentina) were characterised on the basis of their phosphorous, aluminium, iron, calcium, magnesium and sodium contents. Analytical determinations were carried out using inductive coupled plasma optical emission spectrometry (ICP-OES). For characterisation, chemometric metho...
The heavy metal mercury (Hg) is a neurotoxin known to have a serious health impact even at relatively low concentrations. A slurry method was developed for the sensitive and precise determination of mercury in human serum blood samples by cold vapor generation coupled to atomic fluorescence spectrometry (CV-AFS). All variables related to the slurry...
Cloud point extraction (CPE) has been used for the pre-concentration of mercury, after the formation of a complex with 2-(5-bromo-2-pyridylazo)-5-(diethylamino)-phenol (5-Br-PADAP), and later analysis by electrothermal atomic absorption spectrometry (ETAAS) using polyethyleneglycolmono-p-nonyphenylether (PONPE 7.5) as surfactant. The chemical varia...
A time-based flow injection (FI) separation system coupled to electrothermal atomic absorption spectroscopy (ETAAS) has been developed for the determination of selenium in parenteral solutions. Selenate interacts with L-methionine, which is immobilized on controlled pore glass (CPG), at pH 3.0 and eluted with HCl (10% v/v). Total selenium content i...
This study presents the development of a novel on-line pre-concentration method for inorganic molybdenum by flow injection solid-phase extraction with detection by inductively coupled plasma optical emission spectrometry and ultrasonic neb-ulization (SPE-USN-ICP-OES). This method employs a minicolumn filled with ethyl vinyl acetate turnings as the...
This study presents the development of a novel on-line preconcentration method for inorganic molybdenum by flow injection solid-phase extraction with detection by inductively coupled plasma optical emission spectrometry and ultrasonic nebulization (SPE-USN-ICP-OES). This method employs a minicolumn filled with ethyl vinyl acetate turnings as the ad...
Thirty two samples of natural honey produced in the province of La Pampa (Argentina) were characterised on the basis of their phosphorous, aluminium, iron, calcium, magnesium and sodium contents. Analytical determinations were carried out using inductive coupled plasma optical emission spectrometry (ICP-OES). For characterisation, chemometric metho...
A study was undertaken to ascertain the analytical capabilities of L-methionine immobilized on controlled pore glass for Sb preconcentration and speciation. A fully automated on-line system, implemented with hydride generation (HG) and inductively coupled plasma optical emission spectrometry (ICP OES), was used. Sb(III), at pH 10 was selectively re...
This paper presents the development of a pre-concentration and speciation method for inorganic vanadium species by flow injection solid phase extraction-electrothermal atomic absorption spectrometry (FI-SPE-ETAAS). This was carried out by employing a conical mini-column filled with multi-walled carbon nanotubes mounted in the arm of the autosampler...
A new system for on-line preconcentration of molybdenum by sorption on a minicolumn associated to inductively coupled plasma — optical emission spectrometry with ultrasonic nebulization was studied. It is based on the sorption of molybdenum on a column packed with immobilized baker's yeasts on controlled pore glass without further complexing reagen...
An alternative and new system for on-line preconcentration of arsenic by sorption on a mini-column associated to hydride generation--inductively coupled plasma--optical emission spectrometry determination was studied. It is based on the sorption of arsenic on a column packed with ethyl vinyl acetate (EVA) turnings and the use of La(III) as co-preci...
A flow injection system including hydride generation was coupled to an atomic absorption spectrometer (FI-HG-AAS) and was used for the on-line preconcentration and subsequent determination of selenium and tellurium. Trace amounts of both elements were on-line preconcentrated by coprecipitation with La(OH)3 and adsorbed later on a minicolumn packed...
Selenium determination in samples with a high copper content by hydride generation–inductively coupled plasma optical emission spectrometry (HG‐ICP‐OES) after online copper removal and selenium (VI) reduction is described. An activated carbon minicolumn was used for the retention of copper and its subsequent separation of Se. Se(VI) was then online...
An on-line flow injection (FI) preconcentration-electrothermal atomic absorption spectrometry (ETAAS) method is developed for trace determination of chromium in drinking water samples by sorption on a conical minicolumn packed with activated carbon (AC) at pH 5.0. The chromium was removed from the minicolumn with 1.0% (v/v) nitric acid. An enrichme...
A method for the preconcentration and speciation of chromium was developed. On-line preconcentration and determination were obtained using inductively coupled plasma optical emission spectrometry (ICP-OES) coupled with flow injection. To determinate the chromium (III) present in parenteral solutions, chromium was retained on activated carbon at pH...
