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| Damasceno,Odilaine Inácio de Carvalho; Reis,César; Reis,Efraim Lázaro; Bellato,Carlos Roberto; Fidêncio,Paulo Henrique. |
| ABSTRACT Heavy metals contained in electronic waste, if discarded improperly, can become bioavailable after vermicomposting, posing a risk to the environment. Small-scale vermicomposting experiments were carried out with printed circuit boards (PCBs) to investigate the migration of heavy metals (Cu, Pb, Zn, Ni, and Sn) to the final compost, as well as the mobility and bioavailability of these metals. High total levels of Pb, Sn and Cu in samples of manure with electronic waste (MEW) and vegetables with electronic waste (VEW) were detected. Based on the initial metal levels in the PCBs and their concentration in the resulting compost, the order of migration of these metals to the MEW and VEW samples was Sn (23.1 %)>Pb (18.4 %)>Ni (4.63 %)>Zn (0.46... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Electronic waste; Metal contamination; Lead; Sequential extraction. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000601786 |
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| Oliveira,Ely S. A. de; Cardoso,Paulo H. S.; Sousa,Izabelle de P.; Alvarenga,Anarelly C.; Rodrigues,Márcio N.; Sampaio,Regynaldo A.. |
| ABSTRACT In order to reduce the effect of heavy metals on the biosolid, it is necessary to promote its phytoremediation. It is important to know the total content and chemical forms of these elements in the residue for analyzing its behavior and potential toxicity. Thus, the aim of this study was to evaluate the fractionation and behavior of Cu and Zn in biosolid cultivated with Pennisetum purpureum in different periods. The experiment was carried out using a randomized complete block design. The treatments, with five replicates, corresponded to Pennisetum purpureum cultivation in biosolid for 30, 60, 90, 120 and 150 days after planting. The total contents of Cu and Zn in the biosolid remained below the critical limits established by the CONAMA Resolution... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Sequential extraction; Sewage sludge; Speciation of heavy metals. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000100003 |
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| Solís Martínez, Martín. |
| Se evaluó el efecto de la adición de azufre y fósforo sobre la extractabilidad de Pb, Cd y Ni, y en la biodisponibilidad para maíz y alfalfa en el valle del Mezquital, Hidalgo. Se muestrearon los suelos de 13 sitios, se caracterizaron física y químicamente y se determinaron los elementos potencialmente tóxicos totales y extractables. De estos suelos se seleccionaron tres (Atitalaquia, Tlahuelilpan y Tepatepec) para establecer experimentos de equilibrio en el laboratorio. Los suelos se incubaron con dosis crecientes de azufre (0, 2, 4 y 6 t ha-1) y fósforo (0, 250, 500, 1000 y 2000 mg L-1), durante cinco y dos semanas, respectivamente. Se cuantificó la concentración de Pb, Cd y Ni, unidos a las diferentes fracciones del suelo (soluble, FI; intercambiable,... |
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Palavras-chave: Elementos potencialmente tóxicos; Extracción secuencial; Alfalfa; Maíz; Difracción de rayos x; Potentially toxic elements; Sequential extraction; Corn; X-ray diffraction; Edafología; Doctorado. |
| Ano: 2014 |
URL: http://hdl.handle.net/10521/2268 |
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| SCHNEIDER,ISMAEL L.; TEIXEIRA,ELBA C.; RODRIGUES,MARIA LUCIA K.; ROLIM,SILVIA B.A.. |
| The present study aimed to evaluate Cu, Cr, Ni, Zn, Pb, Mn, Al, and Fe contents, as well as their geochemical partitioning in Sinos River basin sediments in southern Brazil. This basin is a densely populated area with a substantial number of industries, especially metallurgy, electroplating works, steel mills, petrochemicals, and tanneries. The total metal concentrations were determined by X-ray fluorescence and the sediment phase concentrations were determined by applying the BCR-701 sequential extraction method proposed by the Community Bureau of Reference of the European Community, using ICP/OES. The contents extracted by a solution of 0.5 mol/L HCl were also considered. Metal contents were evaluated in the sediment fraction <63 µm. Results in the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: BCR-701; Metals; Sediment; Sequential extraction. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301043 |
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| Andrieux-loyer, Francoise; Philippon, Xavier; Bally, Gabriel; Kerouel, Roger; Youenou, Agnes; Le Grand, Jacqueline. |
| The macrotidal estuary of Penze (Brittany, Western part of the Channel, France) has been subjected to recurrent annual toxic blooms of Alexandrium minutum since 1988. This study aims to specify the phosphorus dynamics and bioavailability in sediments in order to improve our understanding of Alexandrium occurrences. Sediment-P pools and diffusive phosphate fluxes were studied under similar hydrodynamic conditions, in the intermediate estuary in May, June and July 2003 and along the salinity gradient from August 2004 to June 2005. The results highlight a decrease in bioavailable phosphorus (iron and organic bound) from the inner part of the estuary seaward. The ratio of iron-bound phosphorus to iron-oxyhydroxides is lower in the inner and intermediate... |
| Tipo: Text |
Palavras-chave: Sequential extraction; Sediment phosphorus; Pore water; Phosphate fluxes; Estuary; Alexandrium minutum. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-4306.pdf |
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