Data/hora: 01/06/2024 07:36:18

Provedor de dados: 	90	
País: 	Brazil	
Título: 	ASSESSMENT OF BIOAVAILABILITY OF HEAVY METALS AFTER VERMICOMPOSTING IN THE PRESENCE OF ELECTRONIC WASTE	
Autores: 	Damasceno,Odilaine Inácio de Carvalho; Reis,César; Reis,Efraim Lázaro; Bellato,Carlos Roberto; Fidêncio,Paulo Henrique.	
Data: 	2015-12-01	
Ano: 	2015	
Palavras-chave: 	Electronic waste; Metal contamination; Lead; Sequential extraction.	
Resumo: 	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 %)&gt;Pb (18.4 %)&gt;Ni (4.63 %)&gt;Zn (0.46 %)&gt;Cu (0.14 %) and Sn (24.3 %)&gt;Pb (23.6 %)&gt;Ni (11.33 %)&gt;Zn (1.76 %)&gt;Cu (0.60 %), respectively. Mobility and bioavailability of these metals in the compost were evaluated by three-stage sequential extraction, where F1 was the exchangeable fraction, F2 the organic fraction and F3 the residual fraction. The bioavailability factor (BF) was calculated by the ratio of the sum of fractions F1 and F2 divided by the total sum of the fractions (F1 + F2 + F3). The highest bioavailability factor (BF = 0.92) was found for Pb, the heavy metal considered the greatest environmental concern in this study, indicating the high mobility and the possibility of becoming bioavailable of this metal.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000601786	
Editor: 	Sociedade Brasileira de Ciência do Solo	
Relação: 	10.1590/01000683rbcs20150060	
Formato: 	text/html	
Fonte: 	Revista Brasileira de Ciência do Solo  v.39 n.6 2015	
Fonte: 	info:eu-repo/semantics/openAccess