12 results on '"Arreghini, S."'
Search Results
2. Effects of Zinc on the Growth of Bulrush (Schoenoplectus californicus) and Its Distribution Between Different Sediment Fractions
- Author
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Arreghini, S., de Cabo, L., de Iorio, A. F., Rendina, A., and Bonetto, C.
- Published
- 2001
- Full Text
- View/download PDF
3. Remediación de efluentes provenientes de feedlots mediante el uso de plantas acuáticas
- Author
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Rizzo, P. F., Bres, P. A., Arreghini, S., Crespo, D. E., Serafini, R. J. M., and Fabrizio de Iorio, A. R.
- Subjects
POLLUTION ,EFFLUENT ,INTENSIVE LIVESTOCK SYSTEMS ,PHYTOREMEDIATION MACROPHYTES - Abstract
47-64 Feedlots have increased in several regions of Argentina, particularly in the Pampas. The absence of adequate treatments of the effluents produced in these establishments creates serious problems to the society. Phytoremediation can be defined as inexpensive and environmentally sustainable strategy used to remove pollutants by plants. The aim of this study was to evaluate the remediation potential of two macrophyte species (Eichhornia crassipes and Hydrocotyle ranunculoides) on a feedlot effluent. This effluent was treated with these species for 31 days. Control and macrophyte treatments decreased dissolved inorganic nitrogen (DIN), Kjeldahl nitrogen (Kj N), biological oxygen demand (BOD), chemical oxygen demand (COD), total dissolved salts (TDS), total phosphorus (TP), Pb, Zn and Cr levels. At macrophyte treatments, relatively constant pH levels were kept and decreased EC and TDS values were obtained compared to control, mitigating the release of contaminants and potential greenhouse gases to the atmosphere. Moreover, significant increases in biomass were obtained, being higher in E. crassipes. The results allow concluding that the presence of aquatic plants increases the removal rates of nutrients, organic matter and heavy metals from wastewater in approximately 10-17 days for a feedlot effluent with high organic load.
- Published
- 2012
4. Dinámica de los contaminantes en el Riachuelo (Buenos Aires, Argentina)
- Author
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Iorio AF De, L, De Cabo, Arreghini S, García A, Bargiela M, Barros MJ, Magdaleno A, Gemini V, Rossi S, MS, Fortunato, Serafini R, M, De Siervi, M, Paz, Korol S, Moretton J, and Rendina
- Published
- 2007
- Full Text
- View/download PDF
5. Influence of rainfall on the discharge, nutrient concentrations and loads of a stream of the 'Pampa Ondulada' (Buenos Aires, Argentina)
- Author
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Arreghini, S., Cabo, L. de, Seoane, R., Tomazin, N., Serafíni, R., and Iorio, A. F. de
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Runoff ,Lowland river ,Hydrological models ,Nutrients ,Riu de plana ,Cabal ,Models hidrològics ,Stream discharge ,Caudal ,Residu líquid ,Río de llanura ,Escorrentía ,Modelos hidrológicos ,Nutrientes - Abstract
The basin area of the Durazno Stream covers approx. 360 km2 of a plain with a gentle slope, mainly devoted to cattle farming and agriculture. This study examines the variability of chemical composition of surface water of the stream in relation to stream discharge, estimated from a hydrological deterministic model from rainfall data. Fifteen samplings were carried out, four in high flow condition and the rest in baseline flow. In each sampling, the main physico-chemical variables were determined. Since discharge data from this stream were not available, it was estimated in situ through an instantaneous unitary hydrograph model. Both estimations of stream discharge were similar. The main forms of dissolved inorganic nitrogen were ammonium and nitrate. The four significant components of PCA that explained 84.4 % of total variance were: mineral component, particulate matter content, ammonium and dissolved phosphorus levels, and nitrates' level. The decreased concentrations of major ions and conductivity during high flow condition suggest solutes' dilution by the massive inflow of water originated by rainfalls. The highest concentrations and loads of suspended solids (SS) (86 mg/l and 22638 kg/day) and particulate organic carbon (POC) (3.1 mg/l and 832 kg/day) were observed in the sample obtained during the rising limb of the hydrograph following a drought period, suggesting that basin erosive processes are more important during the first hours of the storm. Three of the samplings that were carried out in high flow conditions showed low mineral and nutrient content that revealed better water quality. In contrast, the sampling with the greatest total runoff (14.1 mm) showed high concentrations of ammonium (1205 μg/l) and dissolved phosphorus (561 μg/l), suggesting that a long stagnant period on soils with low permeability, could favor reduction processes of nitrate to ammonium and mobilization of dissolved phosphorus to overlying water. The nutrients' loads increased in high flow conditions most likely due to runoff from the riverbank soils. The rise of nutrients, SS, POC and total organic carbon (TOC), loads in the same or in higher proportion than the stream discharge, alerts on the risk of contamination of surface water in an agricultural basin. La cuenca del Arroyo Durazno abarca aproximadamente 360 km2 de una llanura con suave pendiente, dedicada principalmente a ganadería y agricultura. Este estudio examina la variabilidad en la composición química del agua superficial del arroyo en relación con el caudal estimado a través de un modelo hidrológico determinístico a partir de los datos de lluvia. Se realizaron quince muestreos: cuatro en condiciones de alto caudal, los restantes en caudal base. En cada muestreo se determinaron las principales variables fisico-químicas. Dado que no existen datos publicados de caudal de este arroyo, se lo estimó in situ, y a partir del modelo de hidrograma unitario. Ambas estimaciones resultaron similares. Las principales formas de nitrógeno inorgánico disuelto fueron amonio y nitrato. Los primeros 4 factores extraídos del PCA que explicaron 84.4 % de la varianza total fueron: componente mineral, contenido de material particulado, niveles de amonio y fósforo disuelto y nivel de nitratos. El decrecimiento de iones mayoritarios y conductividad durante las condiciones de alto caudal sugiere su dilución por la entrada masiva de agua por lluvias. Las mayores concentraciones y cargas de sólidos suspendidos (SS) (86 mg/l y 22638 kg/día) y carbono orgánico particulado (COP) (3.1 mg/l y 832 kg/día) se hallaron en el muestreo realizado durante la rama ascendente del hidrograma posterior a un período de sequía, sugiriendo que los procesos erosivos de la cuenca son más importantes en las primeras horas de la tormenta. Tres de los muestreos realizados en condiciones de alto caudal presentaron bajo contenido mineral y de nutrientes, indicando mejor calidad de agua. En cambio en el muestreo de mayor lámina de escorrentía acumulada (14.1 mm) las concentraciones de amonio (1205μg/l) y fósforo disuelto (561μg/l) fueron elevadas, sugiriendo que un prolongado periodo de estancamiento en un suelo de baja permeabilidad favorecería los procesos de reducción de nitratos a amonio y la movilización de fósforo disuelto al agua de inundación. Las cargas de nutrientes aumentaron en condiciones de alto caudal probablemente debido al aporte por escorrentía de suelos ribereños. El ascenso en las cargas de nutrientes, SS, COP y carbono orgánico total en igual o mayor magnitud que el caudal alerta sobre el riesgo de contaminación de las aguas superficiales en una cuenca agrícola.
- Published
- 2005
6. Influence of rainfall on the discharge, nutrient concentrations and loads of a stream of the “Pampa Ondulada” (Buenos Aires, Argentina)
- Author
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Arreghini, S., primary
- Published
- 2005
- Full Text
- View/download PDF
7. Effects of Zinc on the Growth of Bulrush () and Its Distribution Between Different Sediment Fractions
- Author
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Arreghini, S., primary, de Cabo, L., additional, de Iorio, A. F., additional, Rendina, A., additional, and Bonetto, C., additional
- Published
- 2001
- Full Text
- View/download PDF
8. Geochemical forms of heavy metals in sediments from the Matanza River and its main affluents
- Author
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Rendina, A., primary, de Cabo, Laura, additional, Arreghini, S., additional, and Iorio, A., additional
- Published
- 2001
- Full Text
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9. Copper, zinc, and chromium accumulation in aquatic macrophytes from a highly polluted river of Argentina.
- Author
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Serafini RJM, Arreghini S, Troiani HE, and de Iorio ARF
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- Chromium analysis, Zinc, Copper, Rivers chemistry, Argentina, Environmental Monitoring methods, Geologic Sediments chemistry, Water Pollutants, Chemical analysis, Metals, Heavy analysis
- Abstract
The aims of this study were to assess Cu, Zn, and Cr pollution in a highly polluted river in Argentina (Matanza-Riachuelo) and to evaluate tolerance strategies and toxic effects in aquatic macrophytes. Chemical techniques were used to assess the bioavailability of these metals and to evaluate their uptake and translocation by plants. The ultrastructure of the roots of a free-floating plant (Eichhornia crassipes) and the leaves of an emergent macrophyte (Sagittaria montevidensis) was examined using transmission electron microscopy. In the lower basin of the river, the highest concentrations of total heavy metals were detected in water (179 µgZn/g; 54 µgCu/g; 240 µgCr/g) and sediments (1499 µgZn/g; 393 µgCu/g; 4886 µgCr/g). In the upper basin of the river, low percentages of Zn and Cu (8 to 25%) were extracted with DTPA and EDTA, probably due to the lithogenic origin of these metals. Higher extraction percentages (24 to 66%) were obtained in the lower basin, in accordance with anthropogenic pollution. For Cr, extraction percentages were low in the upper basin of the river (< 4.5%) and extremely low in the lower basin (< 0.03%). In S. montevidensis, the BCF (bioconcentration factor) and TF (translocation factor) indexes were compatible with heavy metal exclusion mechanisms in sediments, whereas in the E. crassipes, root compartmentalization could be the main tolerance strategy. The leaves of S. montevidensis showed no evidence of damage, whereas ultrastructural alterations (plasmolyzed cells, disorganized membranes) were observed in E. crassipes., (© 2022. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
- Published
- 2023
- Full Text
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10. Shoot litter breakdown and zinc dynamics of an aquatic plant, Schoenoplectus californicus.
- Author
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Arreghini S, de Cabo L, Serafini RJM, and Fabrizio de Iorio A
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- Biodegradation, Environmental, Fresh Water, Metals, Ecosystem, Zinc analysis
- Abstract
Decomposition of plant debris is an important process in determining the structure and function of aquatic ecosystems. The aims were to find a mathematic model fitting the decomposition process of Schoenoplectus californicus shoots containing different Zn concentrations; compare the decomposition rates; and assess metal accumulation/mobilization during decomposition. A litterbag technique was applied with shoots containing three levels of Zn: collected from an unpolluted river (RIV) and from experimental populations at low (LoZn) and high (HiZn) Zn supply. The double exponential model explained S. californicus shoot decomposition, at first, higher initial proportion of refractory fraction in RIV detritus determined a lower decay rate and until 68 days, RIV and LoZn detritus behaved like a source of metal, releasing soluble/weakly bound zinc into the water; after 68 days, they became like a sink. However, HiZn detritus showed rapid release into the water during the first 8 days, changing to the sink condition up to 68 days, and then returning to the source condition up to 369 days. The knowledge of the role of detritus (sink/source) will allow defining a correct management of the vegetation used for zinc removal and providing a valuable tool for environmental remediation and rehabilitation planning.
- Published
- 2018
- Full Text
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11. Effect of the combined addition of Zn and Pb on partitioning in sediments and their accumulation by the emergent macrophyte Schoenoplectus californicus.
- Author
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Arreghini S, de Cabo L, Serafini R, and de Iorio AF
- Subjects
- Biodegradation, Environmental, Biomass, Cyperaceae growth & development, Geologic Sediments chemistry, Plant Roots growth & development, Plant Roots metabolism, Rhizome growth & development, Rhizome metabolism, Wetlands, Cyperaceae metabolism, Environmental Pollutants metabolism, Lead metabolism, Zinc metabolism
- Abstract
Wetlands usually provide a natural mechanism that diminishes the transport of toxic compounds to other compartments of the ecosystem by immobilization and accumulation in belowground tissues and/or soil. This study was conducted to assess the ability of Schoenoplectus californicus growing in natural marsh sediments, with zinc and lead addition, to tolerate and accumulate these metals, taking account of the metal distribution in the sediment fractions. The Zn and Pb were mainly found in available (exchangeable) and potentially available (bound to organic matter) forms, respectively. The absorption of Zn and Pb by plants increased in sediments with added metals. Both metals were largely retained in roots (translocation factor < 1). Lead rhizome concentrations only increased significantly in treatments with high doses of metal independently of added Zn. The addition of Zn increased its concentration in roots and shoots significantly, while its concentration in rhizomes only increased when both metals were added together. Zinc concentration in shoots did not reach the toxic level for plants. Zinc and Pb concentrations in roots were high, but they were not sufficient to reduce biomass growth.
- Published
- 2017
- Full Text
- View/download PDF
12. Phytoremediation of two types of sediment contaminated with Zn by Schoenoplectus americanus.
- Author
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Arreghini S, de Cabo L, and Fabrizio de Iorio A
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- Biodegradation, Environmental, Cyperaceae drug effects, Cyperaceae growth & development, Plant Shoots drug effects, Plant Shoots growth & development, Plant Shoots metabolism, Rhizome drug effects, Rhizome growth & development, Rhizome metabolism, Water Pollutants, Chemical analysis, Water Pollutants, Chemical toxicity, Zinc analysis, Zinc toxicity, Cyperaceae metabolism, Geologic Sediments classification, Water Pollutants, Chemical metabolism, Zinc metabolism
- Abstract
The effect of different sediments on growth, Zn uptake, Zn plant distribution, and morphometric variables of Schoenoplectus americanus were investigated under controlled conditions. Two types of sediments were assayed: from a large natural levee (LS) and alluvial sediments (AS), the former with lower organic matter (OM) and nutrients content than AS, without and with added Zn (2500 microg Zn/g air-dry sediment). Zinc partition in sediment was determined. Increases in water conductivity and Zn concentrations in water and sediments were observed in artificially contaminated treatments. Plants showed a lower above ground growth rate, height, and width of shoots, and a higher Zn concentration in shoots and rhizomes. In the contaminated treatments, AS treatment showed lower Zn concentration in water and higher Zn concentration in sediments (total, exchangeable, and OM fractions) than LS treatment, due to Zn displacement from floodwater to sediments. The presence of a high level of OM and nutrients also increased aboveground biomass growth, whereas it decreased Zn concentration in shoots. Although the translocation factor increased with Zn addition, it was lower in AS treatment Sediments of AS treatments are a suitable environment for growth of S. americanus, which partially compensates the toxic effects of Zn. Our results provide an encouraging basis for planning larger scale experiments to test the role of OM and nutrients in improving phytoremediation.
- Published
- 2006
- Full Text
- View/download PDF
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