Osvaldo Troccoli - Academia.edu (original) (raw)

Papers by Osvaldo Troccoli

Canadian journal of spectroscopy, May 18, 1985

Simultaneous determination of umbelliferone and scopoletin in Tibetan medicine Saussurea laniceps... more Simultaneous determination of umbelliferone and scopoletin in Tibetan medicine Saussurea laniceps and traditional Chinese medicine Radix angelicae pubescentis using excitation-emission matrix fluorescence coupled with second-order calibration method, (2016),

Spectrochimica Acta Part B: Atomic Spectroscopy, 1973

The essembly and performance characteristics are described of a high resolution spectrometer base... more The essembly and performance characteristics are described of a high resolution spectrometer based on 8 piezoelectric scanning Fabry-Perot interferometer. The application of the instrument to the rapid assessment of spectral sources used for analytical atomic spectroscopy is illustrated by evaluetion of the line profiles and self-absorption in hollow-cathode lamps vapour discharge lamps and electrodeless discharge tubes.

Spectrochimica Acta Part B: Atomic Spectroscopy, Feb 1, 1973

The essembly and performance characteristics are described of a high resolution spectrometer base... more The essembly and performance characteristics are described of a high resolution spectrometer based on 8 piezoelectric scanning Fabry-Perot interferometer. The application of the instrument to the rapid assessment of spectral sources used for analytical atomic spectroscopy is illustrated by evaluetion of the line profiles and self-absorption in hollow-cathode lamps vapour discharge lamps and electrodeless discharge tubes.

Analytica Chimica Acta, 1999

The insights provided by integrated detection (conductimetric) as a novel approach to follow phys... more The insights provided by integrated detection (conductimetric) as a novel approach to follow physical dispersion in continuous-¯ow manifolds are presented. This approach replaces the conventional instantaneous detection and permits to follow the dispersion phenomena, including details of the radial component as the sample plug travels the manifold. Integrated detection permits to look at the radial dispersion in a detailed manner inaccessible to instantaneous detection. The effect of different experimental parameters affecting mass distribution was studied (e.g.,¯ow rate, tube length and diameter, injected sample volume, and reactor type) and their effects on integrated response curves are discussed. A single channel manifold employing aqueous nitric acid as the conducting carrier, and water injected as sample plug, and playing the role of an insulator, provided the physicochemical model for the reported studies.

Applied Spectroscopy, May 1, 1973

The use of a continuum source in conjunction with a piezoelectrically scanned Fabry-Perot interfe... more The use of a continuum source in conjunction with a piezoelectrically scanned Fabry-Perot interferometer is described for the observation of absorption line-widths of the calcium 422.67 nm line in hydrogen diffusion flames. The variation of the observed absorption half-width with calcium concentration has been examined. Values for the effective and collisional half-widths for the Ca absorption line are given, and the corresponding a-parameters and collisional cross sections are calculated.

Environmental Pollution, 1989

ABSTRACT Arsenic in the inorganic and organic forms was analyzed in species of marine macro-algae... more ABSTRACT Arsenic in the inorganic and organic forms was analyzed in species of marine macro-algae growing in the South Atlantic Ocean. Species of the genera Lessonia, Gigartina, Adenocystis, Leathesia and Colpomenia were investigated. Arsenic accumulation was found in all species studied. Total As content ranged from 5.3 to 56.9 microg As g(-1) and the levels of the inorganic forms ranged from 0.2 to 2.0 microg As g(-1). The complete analytical procedure was validated against a standard reference material (NBS, SRM 1572, citrus leaves) and the value obtained was in good agreement with the certified value. Some commercial seaweed products were also analyzed.

Verhandlungen, Mar 1, 1998

Environmental Pollution, 1995

Cadmium and lead concentrations were determined in some common algal species living in the southe... more Cadmium and lead concentrations were determined in some common algal species living in the southernmost coasts of Argentina. Two different sampling areas were chosen: Gulf Nuevo, a locality being influenced by a developing industrial city, and Bay Camarones, a traditional harvest area for seaweed exploitation. Selected species of the genera Lessonia, Macrocystis and Gigartina, all of commercial interest, were collected from the harvest area, and analyses showed low levels of the metals in these species. Accumulation of Pb and Cd was also evident in other common brown seaweeds from the industrial site. Analysis of Al was included in this study due to an aluminum works near one of the sampling sites. High values of this metal ranging between 300 and 3000 mg Al/kg (dry basis) were recorded in the industrialized area. Amongst all of the species studied, Colpomenia sinuosa from Gulf Nuevo exhibited the highest values of aluminum. This preliminary survey showed that, except for AI, the levels of Cd and Pb were lower than those reported in same species of seaweeds from the polluted marine waters of the rest of the world.

Analytica Chimica Acta, Apr 1, 2001

... Facundo M. Fernández, Mabel B. Tudino Corresponding Author Contact Information , E-mail The C... more ... Facundo M. Fernández, Mabel B. Tudino Corresponding Author Contact Information , E-mail The Corresponding Author and Osvaldo E. Troccoli. Laboratorio de Análisis de Trazas, Departamento de Química Inorgánica, Analítica y Química Física/INQUIMAE, Facultad de ...

Analytica Chimica Acta, Oct 1, 1999

Three different calibration approaches: Partial Least Squares, Unfold Partial Least Squares and n... more Three different calibration approaches: Partial Least Squares, Unfold Partial Least Squares and n-way Partial Least Squares are compared in terms of explained variance, root mean square error of calibration and root mean square error of cross-validation. Attention is also focused on the application of genetic algorithms to spectral data as a way to obtain an improvement in calibration accuracy. Influence of initial starting conditions for the genetic algorithms (population size, mutation probability, % initial terms etc.) was investigated by means of factorial experimental designs. A simple flow injection manifold coupled to a diode array spectrophotometer and multivariate calibration were employed in order to determine Ni, Cd, Pb, Cu, Zn and Mn. Calibration was not successful for the three first elements. Rapid determination of the microamounts of Cu, Zn and Mn was performed in the presence of concomitant ions with a sample throughput of 180 samples h −1. Since three metals were simultaneously determined, this corresponds to 540 determinations h −1. The effect of different matrix interferences (Fe, Al, Ca, Mg, Cr, Sr, Co) was studied in natural and synthetic water samples. Chemical masking with NaF was assayed for the interferent ions Fe and Al. The typical recoveries ranged from 91 to 94% with typical relative standard deviation between 5 and 10 %.

Analyst, 1997

An automatic separation preconcentration system coupled to an electrothermal (graphite furnace) a... more An automatic separation preconcentration system coupled to an electrothermal (graphite furnace) atomic absorption spectrometer is described. The preconcentration step is performed on a chelating resin microcolumn (Chelex-100) placed in the injection tip of the autosampler. A time based manifold with two- and three-way solenoid valves commanded by an eight channel microcomputer programmable controller is used for column conditioning, preconcentration and washing steps; no manual operations are involved. Elution is performed by the programmable graphite furnace autosampler and achieved in only one step. Operations involving complete and partial injection of the eluate into the graphite furnace are also discussed. The system was applied to the determination of Cd and Pb in near shore sea-water from Patagonia, Argentina. Detection limits of 1 and 8 ng l-1 were obtained for Cd and Pb respectively. Analysis of a certified reference material (CASS-3) showed good agreement with the certified values.

Environmental Pollution, Feb 1, 1999

The content of cadmium, lead, chromium, copper and zinc in algal samples from the Southern Atlant... more The content of cadmium, lead, chromium, copper and zinc in algal samples from the Southern Atlantic coasts was determined by atomic absorption spectrometry. Algal population samples of Ulva lactuca, Enteromorpha prolifera and Porphyra columbina from Gulf San Jorge, Argentina, were collected, composited and pooled. Two stations with dierent exposure degree to human activities, Punta Borja and Punta Maqueda, were selected as sampling points. Freeze-dried algal powders of entire plants were digested in a microwave oven before spectroscopic analysis. This sample preparation program allowed the detection of lower levels of metals than the conventional wet digestion procedure. The content of total cadmium, lead, chromium, copper and zinc in ®ltered seawater from the collection sites was also determined in order to study metal concentration and distribution in the dierent algal species. Taking into account their toxicities, operational speciation of cadmium and lead was also carried out in order to compare metal accumulation in seaweeds under dierent environmental conditions.

Acta Bioquimica Clinica Latinoamericana, 1989

Analytical Chemistry, 1985

ion peak. For ion mobility spectrometers using @Ni ionization, this peak serves as a convenient m... more ion peak. For ion mobility spectrometers using @Ni ionization, this peak serves as a convenient measurement of resolution and the value obtained provides an estimate of the minimum separation performance that can be expected. In most cases, where product ions drift with longer times than reactant ions, resolution will be greater.

Analytica Chimica Acta, 1999

Three different calibration approaches: Partial Least Squares, Unfold Partial Least Squares and n... more Three different calibration approaches: Partial Least Squares, Unfold Partial Least Squares and n-way Partial Least Squares are compared in terms of explained variance, root mean square error of calibration and root mean square error of cross-validation. Attention is also focused on the application of genetic algorithms to spectral data as a way to obtain an improvement in calibration accuracy. Influence of initial starting conditions for the genetic algorithms (population size, mutation probability, % initial terms etc.) was investigated by means of factorial experimental designs. A simple flow injection manifold coupled to a diode array spectrophotometer and multivariate calibration were employed in order to determine Ni, Cd, Pb, Cu, Zn and Mn. Calibration was not successful for the three first elements. Rapid determination of the microamounts of Cu, Zn and Mn was performed in the presence of concomitant ions with a sample throughput of 180 samples h −1. Since three metals were simultaneously determined, this corresponds to 540 determinations h −1. The effect of different matrix interferences (Fe, Al, Ca, Mg, Cr, Sr, Co) was studied in natural and synthetic water samples. Chemical masking with NaF was assayed for the interferent ions Fe and Al. The typical recoveries ranged from 91 to 94% with typical relative standard deviation between 5 and 10 %.

Applications, Theory and Instrumentation, 2006

There has been growing concern during and since the 1990s about the effect that the toxicity and ... more There has been growing concern during and since the 1990s about the effect that the toxicity and persistence of heavy metals will have on the biosphere. Consequently, these new environmental pressures have challenged analysts to find better experimental procedures for handling, recognition and evaluation of traces of heavy metals. Moreover, the determination of low levels of heavy metals in seawater has received particular attention as a way of assessing the early impact of human activities on the marine environment. It is necessary to protect the marine and continental waters against contamination so as to allow suitable conditions for the maintenance of aquatic life and the various uses derived from aquatic life. It is not the metal concentration alone that enables an environmental diagnosis to be made but the way metal combines with other elements to form species. These species are responsible for the biological behavior of the heavy metal under consideration, as its bioavailability will determine the amount of harm it may cause. Thus, “speciation” studies should be conducted to assess the potential environmental impact of human activities. From the analytical point of view, seawater and brines may be considered to be closely related systems in terms of matrix effects and analytical difficulties. Hence these two systems will be included in this article although the aims of heavy metal detection and determination might be diverse in each case. Analytical inaccuracies that arise from the high salt content of the seawater or brine solutions are exacerbated by the low levels of trace metals, which require careful control of contamination during sample collection and analysis and very sensitive analytical techniques. Different techniques for the determination of trace metals in seawater, such as spectroscopic and electroanalytical methods, will be discussed here in terms of their performance in dealing with the problem of trace metal detection and determination. Even the term “trace” has had different meanings over the years, normally being associated with the detection limit of the technique employed (“traces”, “footprints” or “trails” have a lot to do with the way they are observed). Amounts that would have been considered traces in the 1960s are probably no longer considered as such in the 1990s, as detection limits for most heavy metals have been lowered by three to six orders of magnitude (using “state of the art” techniques) since the late 1960s. Special attention has been paid to the preconcentration of the analyte and its isolation from the matrix constituents which might obscure its accurate determination. A variety of separation–preconcentration methods will be presented, with a strong bias towards those procedures leading to some kind of automation, because pretreatment of the samples is often time-consuming and prone to contamination and may lead to an incomplete recovery of the analytes. Flow injection analysis (FIA) has appeared as a solution to time-consuming and complicated separations and it will also be discussed in relation to alternative forms of analysis, especially in terms of its ability to perform speciation studies.

Heavy metal concentrations in the Lower Parana River and right margin of the Rio de la Plata Estu... more Heavy metal concentrations in the Lower Parana River and right margin of the Rio de la Plata Estuary. C Villar, M Tudino, C Bonetto, L De Cabo, J Stripeikis, L d'Huicque, O Troccoli Verh. Int. Ver. Theor. Angew. Limnol./Proc. Int. Assoc. Theor. Appl. Limnol./Trav. Assoc. Int. ...

Spectrochimica Acta Part B: Atomic Spectroscopy, 2001

Hydrobiologia, 1999

Cu, Cr, Pb, Zn and Fe in water, sediment and tissue of the emergent macrophyte Schoenoplectus cal... more Cu, Cr, Pb, Zn and Fe in water, sediment and tissue of the emergent macrophyte Schoenoplectus californicus were studied in three coastal environments differing in aquatic chemistry and tide amplitude: a deltaic floodplain marsh, a coastal vegetated strip of the river and a tidal marsh at the south margin of the Río de la Plata Estuary. Metal content in water

Environmental Pollution, 1999

Canadian journal of spectroscopy, May 18, 1985

Simultaneous determination of umbelliferone and scopoletin in Tibetan medicine Saussurea laniceps... more Simultaneous determination of umbelliferone and scopoletin in Tibetan medicine Saussurea laniceps and traditional Chinese medicine Radix angelicae pubescentis using excitation-emission matrix fluorescence coupled with second-order calibration method, (2016),

Spectrochimica Acta Part B: Atomic Spectroscopy, 1973

The essembly and performance characteristics are described of a high resolution spectrometer base... more The essembly and performance characteristics are described of a high resolution spectrometer based on 8 piezoelectric scanning Fabry-Perot interferometer. The application of the instrument to the rapid assessment of spectral sources used for analytical atomic spectroscopy is illustrated by evaluetion of the line profiles and self-absorption in hollow-cathode lamps vapour discharge lamps and electrodeless discharge tubes.

Spectrochimica Acta Part B: Atomic Spectroscopy, Feb 1, 1973

The essembly and performance characteristics are described of a high resolution spectrometer base... more The essembly and performance characteristics are described of a high resolution spectrometer based on 8 piezoelectric scanning Fabry-Perot interferometer. The application of the instrument to the rapid assessment of spectral sources used for analytical atomic spectroscopy is illustrated by evaluetion of the line profiles and self-absorption in hollow-cathode lamps vapour discharge lamps and electrodeless discharge tubes.

Analytica Chimica Acta, 1999

The insights provided by integrated detection (conductimetric) as a novel approach to follow phys... more The insights provided by integrated detection (conductimetric) as a novel approach to follow physical dispersion in continuous-¯ow manifolds are presented. This approach replaces the conventional instantaneous detection and permits to follow the dispersion phenomena, including details of the radial component as the sample plug travels the manifold. Integrated detection permits to look at the radial dispersion in a detailed manner inaccessible to instantaneous detection. The effect of different experimental parameters affecting mass distribution was studied (e.g.,¯ow rate, tube length and diameter, injected sample volume, and reactor type) and their effects on integrated response curves are discussed. A single channel manifold employing aqueous nitric acid as the conducting carrier, and water injected as sample plug, and playing the role of an insulator, provided the physicochemical model for the reported studies.

Applied Spectroscopy, May 1, 1973

The use of a continuum source in conjunction with a piezoelectrically scanned Fabry-Perot interfe... more The use of a continuum source in conjunction with a piezoelectrically scanned Fabry-Perot interferometer is described for the observation of absorption line-widths of the calcium 422.67 nm line in hydrogen diffusion flames. The variation of the observed absorption half-width with calcium concentration has been examined. Values for the effective and collisional half-widths for the Ca absorption line are given, and the corresponding a-parameters and collisional cross sections are calculated.

Environmental Pollution, 1989

ABSTRACT Arsenic in the inorganic and organic forms was analyzed in species of marine macro-algae... more ABSTRACT Arsenic in the inorganic and organic forms was analyzed in species of marine macro-algae growing in the South Atlantic Ocean. Species of the genera Lessonia, Gigartina, Adenocystis, Leathesia and Colpomenia were investigated. Arsenic accumulation was found in all species studied. Total As content ranged from 5.3 to 56.9 microg As g(-1) and the levels of the inorganic forms ranged from 0.2 to 2.0 microg As g(-1). The complete analytical procedure was validated against a standard reference material (NBS, SRM 1572, citrus leaves) and the value obtained was in good agreement with the certified value. Some commercial seaweed products were also analyzed.

Verhandlungen, Mar 1, 1998

Environmental Pollution, 1995

Cadmium and lead concentrations were determined in some common algal species living in the southe... more Cadmium and lead concentrations were determined in some common algal species living in the southernmost coasts of Argentina. Two different sampling areas were chosen: Gulf Nuevo, a locality being influenced by a developing industrial city, and Bay Camarones, a traditional harvest area for seaweed exploitation. Selected species of the genera Lessonia, Macrocystis and Gigartina, all of commercial interest, were collected from the harvest area, and analyses showed low levels of the metals in these species. Accumulation of Pb and Cd was also evident in other common brown seaweeds from the industrial site. Analysis of Al was included in this study due to an aluminum works near one of the sampling sites. High values of this metal ranging between 300 and 3000 mg Al/kg (dry basis) were recorded in the industrialized area. Amongst all of the species studied, Colpomenia sinuosa from Gulf Nuevo exhibited the highest values of aluminum. This preliminary survey showed that, except for AI, the levels of Cd and Pb were lower than those reported in same species of seaweeds from the polluted marine waters of the rest of the world.

Analytica Chimica Acta, Apr 1, 2001

... Facundo M. Fernández, Mabel B. Tudino Corresponding Author Contact Information , E-mail The C... more ... Facundo M. Fernández, Mabel B. Tudino Corresponding Author Contact Information , E-mail The Corresponding Author and Osvaldo E. Troccoli. Laboratorio de Análisis de Trazas, Departamento de Química Inorgánica, Analítica y Química Física/INQUIMAE, Facultad de ...

Analytica Chimica Acta, Oct 1, 1999

Three different calibration approaches: Partial Least Squares, Unfold Partial Least Squares and n... more Three different calibration approaches: Partial Least Squares, Unfold Partial Least Squares and n-way Partial Least Squares are compared in terms of explained variance, root mean square error of calibration and root mean square error of cross-validation. Attention is also focused on the application of genetic algorithms to spectral data as a way to obtain an improvement in calibration accuracy. Influence of initial starting conditions for the genetic algorithms (population size, mutation probability, % initial terms etc.) was investigated by means of factorial experimental designs. A simple flow injection manifold coupled to a diode array spectrophotometer and multivariate calibration were employed in order to determine Ni, Cd, Pb, Cu, Zn and Mn. Calibration was not successful for the three first elements. Rapid determination of the microamounts of Cu, Zn and Mn was performed in the presence of concomitant ions with a sample throughput of 180 samples h −1. Since three metals were simultaneously determined, this corresponds to 540 determinations h −1. The effect of different matrix interferences (Fe, Al, Ca, Mg, Cr, Sr, Co) was studied in natural and synthetic water samples. Chemical masking with NaF was assayed for the interferent ions Fe and Al. The typical recoveries ranged from 91 to 94% with typical relative standard deviation between 5 and 10 %.

Analyst, 1997

An automatic separation preconcentration system coupled to an electrothermal (graphite furnace) a... more An automatic separation preconcentration system coupled to an electrothermal (graphite furnace) atomic absorption spectrometer is described. The preconcentration step is performed on a chelating resin microcolumn (Chelex-100) placed in the injection tip of the autosampler. A time based manifold with two- and three-way solenoid valves commanded by an eight channel microcomputer programmable controller is used for column conditioning, preconcentration and washing steps; no manual operations are involved. Elution is performed by the programmable graphite furnace autosampler and achieved in only one step. Operations involving complete and partial injection of the eluate into the graphite furnace are also discussed. The system was applied to the determination of Cd and Pb in near shore sea-water from Patagonia, Argentina. Detection limits of 1 and 8 ng l-1 were obtained for Cd and Pb respectively. Analysis of a certified reference material (CASS-3) showed good agreement with the certified values.

Environmental Pollution, Feb 1, 1999

The content of cadmium, lead, chromium, copper and zinc in algal samples from the Southern Atlant... more The content of cadmium, lead, chromium, copper and zinc in algal samples from the Southern Atlantic coasts was determined by atomic absorption spectrometry. Algal population samples of Ulva lactuca, Enteromorpha prolifera and Porphyra columbina from Gulf San Jorge, Argentina, were collected, composited and pooled. Two stations with dierent exposure degree to human activities, Punta Borja and Punta Maqueda, were selected as sampling points. Freeze-dried algal powders of entire plants were digested in a microwave oven before spectroscopic analysis. This sample preparation program allowed the detection of lower levels of metals than the conventional wet digestion procedure. The content of total cadmium, lead, chromium, copper and zinc in ®ltered seawater from the collection sites was also determined in order to study metal concentration and distribution in the dierent algal species. Taking into account their toxicities, operational speciation of cadmium and lead was also carried out in order to compare metal accumulation in seaweeds under dierent environmental conditions.

Acta Bioquimica Clinica Latinoamericana, 1989

Analytical Chemistry, 1985

ion peak. For ion mobility spectrometers using @Ni ionization, this peak serves as a convenient m... more ion peak. For ion mobility spectrometers using @Ni ionization, this peak serves as a convenient measurement of resolution and the value obtained provides an estimate of the minimum separation performance that can be expected. In most cases, where product ions drift with longer times than reactant ions, resolution will be greater.

Analytica Chimica Acta, 1999

Three different calibration approaches: Partial Least Squares, Unfold Partial Least Squares and n... more Three different calibration approaches: Partial Least Squares, Unfold Partial Least Squares and n-way Partial Least Squares are compared in terms of explained variance, root mean square error of calibration and root mean square error of cross-validation. Attention is also focused on the application of genetic algorithms to spectral data as a way to obtain an improvement in calibration accuracy. Influence of initial starting conditions for the genetic algorithms (population size, mutation probability, % initial terms etc.) was investigated by means of factorial experimental designs. A simple flow injection manifold coupled to a diode array spectrophotometer and multivariate calibration were employed in order to determine Ni, Cd, Pb, Cu, Zn and Mn. Calibration was not successful for the three first elements. Rapid determination of the microamounts of Cu, Zn and Mn was performed in the presence of concomitant ions with a sample throughput of 180 samples h −1. Since three metals were simultaneously determined, this corresponds to 540 determinations h −1. The effect of different matrix interferences (Fe, Al, Ca, Mg, Cr, Sr, Co) was studied in natural and synthetic water samples. Chemical masking with NaF was assayed for the interferent ions Fe and Al. The typical recoveries ranged from 91 to 94% with typical relative standard deviation between 5 and 10 %.

Applications, Theory and Instrumentation, 2006

There has been growing concern during and since the 1990s about the effect that the toxicity and ... more There has been growing concern during and since the 1990s about the effect that the toxicity and persistence of heavy metals will have on the biosphere. Consequently, these new environmental pressures have challenged analysts to find better experimental procedures for handling, recognition and evaluation of traces of heavy metals. Moreover, the determination of low levels of heavy metals in seawater has received particular attention as a way of assessing the early impact of human activities on the marine environment. It is necessary to protect the marine and continental waters against contamination so as to allow suitable conditions for the maintenance of aquatic life and the various uses derived from aquatic life. It is not the metal concentration alone that enables an environmental diagnosis to be made but the way metal combines with other elements to form species. These species are responsible for the biological behavior of the heavy metal under consideration, as its bioavailability will determine the amount of harm it may cause. Thus, “speciation” studies should be conducted to assess the potential environmental impact of human activities. From the analytical point of view, seawater and brines may be considered to be closely related systems in terms of matrix effects and analytical difficulties. Hence these two systems will be included in this article although the aims of heavy metal detection and determination might be diverse in each case. Analytical inaccuracies that arise from the high salt content of the seawater or brine solutions are exacerbated by the low levels of trace metals, which require careful control of contamination during sample collection and analysis and very sensitive analytical techniques. Different techniques for the determination of trace metals in seawater, such as spectroscopic and electroanalytical methods, will be discussed here in terms of their performance in dealing with the problem of trace metal detection and determination. Even the term “trace” has had different meanings over the years, normally being associated with the detection limit of the technique employed (“traces”, “footprints” or “trails” have a lot to do with the way they are observed). Amounts that would have been considered traces in the 1960s are probably no longer considered as such in the 1990s, as detection limits for most heavy metals have been lowered by three to six orders of magnitude (using “state of the art” techniques) since the late 1960s. Special attention has been paid to the preconcentration of the analyte and its isolation from the matrix constituents which might obscure its accurate determination. A variety of separation–preconcentration methods will be presented, with a strong bias towards those procedures leading to some kind of automation, because pretreatment of the samples is often time-consuming and prone to contamination and may lead to an incomplete recovery of the analytes. Flow injection analysis (FIA) has appeared as a solution to time-consuming and complicated separations and it will also be discussed in relation to alternative forms of analysis, especially in terms of its ability to perform speciation studies.

Heavy metal concentrations in the Lower Parana River and right margin of the Rio de la Plata Estu... more Heavy metal concentrations in the Lower Parana River and right margin of the Rio de la Plata Estuary. C Villar, M Tudino, C Bonetto, L De Cabo, J Stripeikis, L d'Huicque, O Troccoli Verh. Int. Ver. Theor. Angew. Limnol./Proc. Int. Assoc. Theor. Appl. Limnol./Trav. Assoc. Int. ...

Spectrochimica Acta Part B: Atomic Spectroscopy, 2001

Hydrobiologia, 1999

Cu, Cr, Pb, Zn and Fe in water, sediment and tissue of the emergent macrophyte Schoenoplectus cal... more Cu, Cr, Pb, Zn and Fe in water, sediment and tissue of the emergent macrophyte Schoenoplectus californicus were studied in three coastal environments differing in aquatic chemistry and tide amplitude: a deltaic floodplain marsh, a coastal vegetated strip of the river and a tidal marsh at the south margin of the Río de la Plata Estuary. Metal content in water

Environmental Pollution, 1999