Juan Antelo

Juan Antelo
University of Santiago de Compostela | USC · Department of Edafology and Agricultural Chemistry

PhD Chemistry

About

74
Publications
16,626
Reads
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2,371
Citations
Citations since 2017
29 Research Items
1404 Citations
2017201820192020202120222023050100150200250300
2017201820192020202120222023050100150200250300
2017201820192020202120222023050100150200250300
2017201820192020202120222023050100150200250300
Additional affiliations
January 2010 - present
University of Santiago de Compostela
Position
  • Teaching & Research position (IIP)
January 2008 - January 2009
Centre of Ecology and Hydrolgy, Lancaster
Position
  • Postdoctoral Position
September 2005 - February 2007
Wageningen University & Research
Position
  • Postdoctoral Position
Education
January 2000 - December 2004
University of Santiago de Compostela
Field of study
  • Geochemistry
September 1994 - May 1999

Publications

Publications (74)
Article
Goethite is a common iron oxide present in the environment. It is used as a model system to represent the mineral fraction of the soil, whereas humic acid is used as a model system to represent natural organic matter (NOM). In this study, we tried to understand the behaviour of anionic and cationic pollutants in a model system, which could easily r...
Article
Biochar samples were generated by low temperature pyrolysis of different types of waste. The physicochemical characteristics of the different types of biochar affected the copper retention capacity, by determining the main mechanism involved. The capacity of the biochar to retain copper present in solution depended on the size of the inorganic frac...
Article
The formation, transformation and surface chemistry of iron oxides is geologically important in surface waters polluted by acid mine drainage (AMD). The geochemical behaviour of these oxides controls the availability and mobility of contaminants in such highly polluted systems. The low pH values, together with the presence of large amounts of sulph...
Article
The presence of iron oxides may play an important role in controlling the mobility and availability of contaminants in soils and waters affected by acid mine drainage. The present study describes the uptake of arsenate, chromate and molybdate from solution by synthetic schwertmannite. Batch experiments were performed at different pH values in order...
Article
Full-text available
The degree of stability and maturity of the organic matter are fundamental features of the chemical characterization of compost. These characteristics are related to the extensive formation of aromatic structures and of oxygen-containing functional groups. The increase of the amount of these chemical moieties can be assessed by different analytical...
Article
Full-text available
The potential of composts produced from different origin residues to be used in environmentally friendly agriculture is addressed in this work. Seven composts obtained from different raw materials and composting methodologies are compared using elemental, thermal and spectroscopic characterization data. Despite the stabilization of the organic matt...
Article
Full-text available
Schwertmannite is a metastable mineral playing a crucial role in the immobilization of metal(oid)s in acid mine drainage (AMD) systems. High temperatures associated with wildfires could lead to a sudden schwertmannite transformation, changing the mobility of metal(oid)s. The objective of the present study was to examine the thermal transformation f...
Article
The Olsen method is widely used to determine bioavailable phosphate (P) in upland soils. It is also used in flooded soils, although different estimates of extractable-P are obtained under anoxic and oxic conditions. In this study, variations in extractable-P in three soils under different redox conditions were evaluated as a function of solid to so...
Article
Full-text available
Soil and water characteristics and biogeochemical processes can be improved by the application of an integrated technology based on circular economy: designed Technosol. The evaluation of the effectiveness of the superficial application of a designed Technosol, with andic and eutrophic properties, on the rehabilitation of sulfide tailings of a uran...
Article
Cation sorption on clays and on humic acids (HA) has been extensively documented in scientific literature. Both are important components of natural environments, especially in soils, and therefore, innate competitors in the retention of metallic cations. The aim of this work was to investigate the sorption behavior of thallium (I) on a 2:1 type cla...
Article
Composting and vermicomposting have attracted attention in relation to both waste management and the potential to produce organic amendments that could improve soil quality. The main differences between compost depend on the feedstock, the production process, and the degree of maturity. In the present study, samples of compost of different origin (...
Article
The availability of phosphorus (P) in estuarine ecosystems is ultimately controlled by the nature of interactions between dissolved P and the soil components (e.g., soil minerals), especially iron (Fe) oxyhydroxides. P retention on Fe oxyhydroxides and its subsequent availability depends on mineral crystallinity and susceptibility to dissolution. H...
Article
Secondary iron oxides formed in acid mine drainage, such as schwertmannite, are scavengers for metal(loid) s in mining environments. Increasing the understanding of the geochemical transformations of these minerals, as well as knowing how metal(loid)s affect these transformations, is crucial to ultimately predict the fate of these trace elements in...
Article
Low redox potential in flooded soils may affect phosphate bioavailability by reducing iron oxides or formation of new minerals. To investigate phosphate behavior in anoxic conditions, goethite was selected as a soil model and coated by humic acid (HA) and sodium borohydride was used as a reducing agent. Adsorption experiments were conducted in 0.1...
Article
Full-text available
Mining activity leads to several environmental impacts. After the closure, the realization of a holistic evaluation of the main ecosystem components and their environmental risks is essential in order to de ne and manage a sustainable rehabilitation program speci c to the current environmental situation. e objective of this work was to evaluate the...
Conference Paper
Full-text available
Acid mine drainage (AMD) occurs as a consequence of the weathering and oxidation of iron sulphide minerals. Subsequently, the formation of secondary iron oxides takes place. However, these secondary iron oxides can undergo important transformations upon changes in the pH or redox conditions that will affect the mobility of associated toxic species....
Article
The potential of a calcium silicate hydrate waste product to remove phosphate from sewage treatment plants was tested by using the residue as the sorbent material in an experimental filter bed. Pseudo-second order and intraparticle diffusion models were used to explain the kinetics of phosphate adsorption on the solid material, and the Freundlich e...
Conference Paper
Full-text available
Este trabajo tuvo como objetivo evaluar, a largo plazo y mediante el análisis de la concentración multielemental en lixiviados, el riesgo ambiental de materiales de escombrera con sulfuros (mina Fé, España) tras la aplicación superficial de un Tecnosol diseñado con propiedades ándicas y eutróficas. Tras 20 meses de su aplicación, muestras de Tecnos...
Article
Full-text available
Pyrolysis of waste materials to produce biochar is an excellent and suitable alternative supporting a circular bio-based economy. One of the properties attributed to biochar is the capacity for sorbing organic contaminants, which is determined by its composition and physicochemical characteristics. In this study, the capacity of waste-derived bioch...
Article
Full-text available
The chemical stabilization, or immobilization, of trace elements (metals and metalloids; TE) in contaminated soil has been studied for decades. A vast number of scientific publications are available on the method performance in laboratory settings, reporting that the application of various soil amendments to contaminated soil reduces TE mobility, b...
Article
Full-text available
Purpose: Phosphorus is an essential element that at high concentrations generates eutrophication of aquatic systems. In this study, we used batch and continuous tests to evaluate the efficiency of a Technosol to retain the phosphorus present (as phosphate) in aqueous samples. Materials and methods: Phosphate sorption on Technosol was studied throu...
Article
A generic hydrous Fe oxide surface is often used in surface complexation modeling for predicting metal behavior in aqueous and soil environments. However, this approach may lead to incorrect results because there are many different naturally-occurring Fe(III) (oxyhydr)oxide mineral phases in the environment, each exhibiting distinct adsorption char...
Article
The development of three-dimensional (3D) patterned Cu-based composites with Al2O3 matrix has significant potential for an array of uses in industrial applications ranging from aerospace to catalysis. However, to date, it was not possible to fabricate complex structures of these composites by applying conventional techniques. The 3D printing techni...
Article
Secondary iron minerals are important in mining areas as they are natural scavengers of many contaminants. Thus, aluminium and iron oxides derived from acid mine drainage determine the fate of trace metals commonly found in mining areas. They mainly do this via sorption processes, which prevent leaching of the metals and contamination of surface an...
Article
Organo-mineral composites formed by the association of iron (hydr)oxides and organic matter are widespread in natural environments and play an important role as scavengers of bioessential elements and contaminants. To better understand the mobility and fate of Cu in natural soils and sediments we precipitated ferrihydrite and goethite organo-minera...
Article
The discharges from industrial processes constitute the main source of copper contamination in aqueous ecosystems. In this study we investigated the capacity of different types of biochar (derived from chicken manure, eucalyptus, corncob, olive mill and pine sawdust) to remove copper from aqueous solution in a continuous-flow system. The flow rate...
Conference Paper
Full-text available
Acid mine drainage (AMD) causes acidification of surface waters in combination with the release of trace elements, such as As, Cr, U, and Mo. The presence of secondary iron minerals can be considered of great importance in these areas, since they are naturally occurring scavengers and ultimately define the mobility of contaminants. However, additio...
Conference Paper
Este trabajo tuvo como objectivo evaluar la mejoría de la calidad químicas de las aguas de escorrentía de una escombrera con contaminación polimétalica mediante la aplicación de un Tecnosol “a la carta”. Las aguas de escorrentía de las escombreras presentaron pH ácido, elevada C.E (12 mS/cm) y Eh (691 mV) y contaminación multielemental. El empleo d...
Article
Full-text available
Acid mine drainage (AMD) constitutes a serious environmental problem in mining areas due to the acidification of soils and aquatic systems, and the release of toxic metals. Many of the pollutants that occur in AMD display a high affinity for the surfaces of the aluminium and iron oxides that are typically present in systems affected by AMD. This bi...
Article
Like many threatened species, unionoid bivalves are facing severe extinction rates. Because of their sensitivity to ecosystem stress, many of this group are considered bioindicator species. The highly threatened Margaritifera margaritifera is a clear example of this. A benthic filter feeder, sedentary and long-lived, the freshwater pearl mussel is...
Conference Paper
Full-text available
Acid mine drainage (AMD) constitutes a serious environmental problem in mining areas due to acidification and to the release of toxic metals to soils and aquatic systems. Many of the pollutants that occur in AMD display a high affinity for the amorphous iron oxides that are typically present in the environmental settings affected by AMD. This bindi...
Conference Paper
Full-text available
Sorption and desorption reactions have an important influence on the fate of pollutants, which can be retained by the organic or mineral fractions present in the soil. These reactions depend on the nature, relative amounts and properties of these soil fractions. Copper and arsenate are relevant inorganic contaminants involved in processes related t...
Article
Full-text available
Fulvic acids (FA) and humic acids (HA) were extracted from two horizons of a minerotro-phic peat bog in Galicia (NW Spain). The samples were characterized and their acid base properties studied with the techniques commonly used for this type of determinations: UV-Vis, FT-IR, 13 C NMR spectrosco-pies, elemental analysis and potentiometric titrations...
Article
High levels of oxyanions are found in the soil environment, often as a result of human activity. At high concentrations, oxyanions can be harmful to both humans and wildlife. Information about the interactions between oxyanions and natural samples is essential for understanding the bioavailability, toxicity and transport of these compounds in the e...
Conference Paper
Full-text available
The physico-chemical properties of surface water collected from small boggy catchments present at an ombrotrophic peatland located at the Xistral Mountains (NW Spain) were monitored over a 6-month period in order to obtain information on the dynamic of nutrients and trace elements in such systems. Additionally, the same properties were monitored fo...
Conference Paper
Full-text available
Se determinó la capacidad máxima de adsorción de fosfatos en un Tecnosol con propiedades ándicas. El Tecnosol fue diseñado, formulado y elaborado para reducir las concentraciones de P en sistemas acuáticos, contribuyendo a la reducción de la eutrofización y sus consecuencias nocivas. Después de seis meses sumergido en aguas del río Limia, la capaci...
Article
Surface complexation models have proved to be valuable tools for predicting processes that occur at the solid–solution interface. Use of such models has become more widespread and nowadays more complex systems are studied, trying to explain processes such as the competition between different species for mineral surfaces and the effect of the presen...
Article
Full-text available
For accurate interpretation of cation binding to natural organic matter, the proton binding behaviour of both solid and dissolved natural organic matter must first be established. In the present study, potentiometric titrations of samples of humin and humic acid extracted from a peat soil were performed at different ionic strengths. Humic acid (HA)...
Article
Herbicides that interact with soil organic matter do so with both the solid and the dissolved fractions, so that the distribution of herbicide between the soil solution and solid phases is determined by competitive effects. In the present study, adsorption experiments were carried out with the cationic herbicide paraquat and untreated and acid-wash...
Article
A sample of an ombrotrophic peat was washed thoroughly with nitric acid to release bound cations, and potentiometric titrations were carried out with the untreated peat and the acid-washed peat at five different ionic strengths of between 0.01 and 0.3M. The experimental titration curves were used to obtain the absolute charge–pH curves for the acid...
Article
Full-text available
Ferrihydrite (FH) is a common hydrous ferric oxide nanomineral in aqueous geo- chemical environments. Its small particle sizes (1.5-5 nm) expose a very high specific surface area at the mineral/water interface, and this may have considerable influence on the transport and fate of a variety of trace and major elements through diverse sorption proces...
Article
Full-text available
Ferrihydrite (FH) is a common hydrous ferric oxide nanomineral in aqueous geo–chemical environments. Its small particle sizes (1.5–5 nm) expose a very high specific surface area at the mineral/water interface, and this may have considerable influence on the transport and fate of a variety of trace and major elements through diverse sorption process...
Article
Adsorption of cationic pesticides in soils is generally attributed to mineral clays and organic matter components. However, iron oxides may also contribute to such adsorption or affect it by associating with other components. Using goethite and humic acid as models for iron oxides and organic matter respectively, we studied the adsorption of the ca...
Article
Ferrihydrite nanoparticles may dominate the ion binding properties of the natural oxide fraction present in soil and aquatic systems. A correct description of the adsorption properties of ferrihydrite nanoparticles may be useful for gaining a better insight into the adsorption processes in natural systems and at the same time will be essential for...
Article
Anionic pesticides are adsorbed on the mineral oxide fraction of the soil surface but considerably less on the organic fraction, so that the presence of organic matter causes a decrease in the amount of pesticide adsorbed, and may affect the mechanism of adsorption. In the present study we investigated the adsorption of the weak acid pesticide MCPA...
Article
Information on the particle size and reactive surface area of natural samples is essential for the application of surface complexation models (SCM) to predict bioavailability, toxicity, and transport of elements in the natural environment. In addition, this information will be of great help to enlighten views on the formation, stability, and struct...
Article
Information on the particle size and reactive surface area of natural samples and its interaction with natural organic matter (NOM) is essential for the understanding bioavailability, toxicity, and transport of elements in the natural environment. In part I of this series (Hiemstra et al., 2010), a method is presented that allows the determination...
Article
The effect of pH and ionic strength on the interaction between pesticides (paraquat and MCPA) and humic substances (soil extracted humic acid and fulvic acid) was interpreted with a simple electrostatic model. Potentiometric titrations were carried out, the charge curves for the humic substances were obtained for three values of ionic strength, and...
Article
Full-text available
The transport and bioavailability of nutrients and contaminants in the environment is mainly controlled by adsorption processes on the soil reactive surfaces. There are many studies of the anion adsorption properties on mineral surfaces (Antelo et al., 2005; Stachowicz et al., 2008) in which surface complexation models are applied to predict the ex...
Article
The effect of pH on the adsorption of copper (Cu), lead (Pb) and cadmium (Cd) by a peat soil was studied, and the results compared with those corresponding to cation binding by a dissolved peat humic acid (HA), and interpreted with a NICA–Donnan model. A potentiometric titration technique was used to determine the adsorption isotherms for H+, at di...
Article
Full-text available
Copper adsorption processes on aluminium oxides may significantly control the mobility and transport of copper ions in soils and surface waters. The binding of protons and copper to humic acid (HA) and to gibbsite as single sorbent systems was investigated and the results then used to test the validity of the Linear Additivity Model (LAM) for descr...
Article
We studied the acid-base properties of 16 fulvic acids and 16 humic acids isolated from the surface (3–15 cm) and subsurface (> 45 cm) horizons of two types of acid forest soils, derived respectively from amphibolite and granite rocks, under five different types of vegetation. The observed differences between the contents of humic substances in the...
Article
We have tested to see if the generic set of NICA-Donnan model parameters, used to describe isolated humic substances, can also describe soil humic substances in situ. A potentiometric back-titration technique was used to determine the variable surface charge of two organic peat soils at three different ionic strengths. The non-ideal, competitive-ad...
Article
In order to be able to make predictions about the bioavailability and transport of contaminants and nutrients in soils, detailed knowledge is required about the adsorption of natural organic matter on the surface of oxides, as well as the processes of competition with the different ions present in the soil. With this aim, experiments investigating...
Article
The adsorption kinetics of phosphate on goethite has been studied by batch adsorption experiments and by in situ ATR-IR spectroscopy at different pH, initial phosphate concentrations and stirring rates. Batch adsorption results are very similar to those reported by several authors, and show a rather fast initial adsorption taking place in a few min...
Article
The surface properties of a well-crystallized synthetic goethite have been studied by acid-base potentiometric titrations, electrophoresis, and phosphate and arsenate adsorption isotherms at different pH and electrolyte concentrations. The PZC and IEP of the studied goethite were 9.3+/-0.1 and 9.3+/-0.2, respectively. Phosphate and arsenate adsorpt...
Article
Full-text available
Humic and fulvic acids were extracted from the surface and a deeper (>45 cm) Ah horizon of two acid forest soils developed from amphibolites and granites, under five different types of vegetation. Elemental analysis and UV-vis and NMR spectroscopy were used to determine the chemical structures. The concentration of humic acid in the soil decreased...
Article
The acid-base properties of two fulvic acids (FA) extracted from senescent leaves of eucalyptus and oak were characterized by carrying out potentiometric titrations at two FA concentrations and four ionic strengths (0.005 M <[KNO(3)] <1.0 M). Experimental data were analyzed by means of the master curve approach, which includes an electrostatic sphe...
Article
Full-text available
A cloud point extraction-preconcentration methodology for the speciation analysis of free and organically complexed metal species in natural waters is presented. The method is based on the neutralization of the electrostatic charge of the humate-metal complexes with a positively charged surfactant in a high ionic strength solution environment. The...

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Project (1)
Project
The objective of this project is to perform an extensive and novel study of the resulting mineralogy upon slow oxidation of collected Fe-rich sulfide tailings at AMD conditions. The resulting minerals would differ from those resulting from rapid-oxidation, as a result of the distinct kinetic rates of the different biogeochemical processes involved in the mineral formation. Increasing knowledge on the fate of iron, sulfur and TE upon slow oxidation as well as deciphering which factors and processes lead to different mineralogy is one of the goals of this project.