%0 Journal Article
%T SEQUENTIAL EXTRACTION AND SPECIATION OF HEAVY METALS IN THE PROCESS OF COMPOSTING OF WASTE GARBAGE = EXTRA  O SEQUENCIAL E ESPECIA  O DE METAIS PESADOS NO DECORRER DO PROCESSO DE COMPOSTAGEM DE RES赤DUOS S車LIDOS DOMICILIARES
%A Jos谷 Carlos Chitolina
%A F芍bio Cesar da Silva
%A Valter Barbieri
%A Stefan Barradas Podsclan
%J Holos Environment
%D 2012
%I Universidade Estadual Paulista
%X Environmental pollution by heavy metals caused by the intensification of industrial activities, agriculture and urbanization, especially the generation of solid waste and the necessity of treat them biologically is a growing problem, causing serious ecological impacts. It carried out sequential extraction for heavy metals speciation in organic trash during composting, objecting the understanding of chemical Cu, Mn and Zn transformations and environmental risks. The extractors utilized in sequence and the respective fractions (beginning and ending of composting) were MgCl2 (soluble fraction 每 5, 2% to Cu; 6, 7% to Mn; <1 to Zn; 2, 3% to Ni; 0.7, 0.1% to Pb; 24, 33% to Cd); CH3COONa (carbonate 每 4, 3% to Cu; 24, 28% to Mn; 25, 20% to Zn; 6, 7% to Ni; 18, 13% to Pb; 37, 33% to Cd); Hidroxilamina+HOA (reduced/ oxidated) 每 4% to Cu, 6, 21% to Mn and 22, 17% to Zn; 10, 14% to Ni, 38, 21% to Pb and 0% to Cd); H2O2+NH4OAc (organic 每 22, 41% to Cu, 3, 4% to Mn; 7, 4% to Zn; 6, 14% to Ni, 39, 49% to Pb and 0% to Cd) and HNO3+HClO4 (remaining portion 每 65, 50% to Cu, 61, 40% to Mn; 45, 58% to Zn; 76, 62% to Ni, 4, 17% to Pb; 38, 34% to Cd). The results show that composting process provides that the biggest fractions of Cu is organic or residual, Mn in carbonate or reduced forms and the Zn remains in the residual or reduced forms, Ni and Pb are organic or residual and the Cd remains in the residual or carbonate forms, offering bigger ambient risks. = A polui  o ambiental por metais pesados, pela intensifica  o das atividades industriais, agr赤colas e urbaniza  o, em especial a gera  o de res赤duos s車lidos e a necessidade de trat芍-los biologicamente consiste num problema crescente, respons芍vel por s谷rios impactos ecol車gicos. Efetuou-se extra  o sequencial de metais pesados para avaliar a especia  o de Cu, Cd, Mn, Ni, Pb e Zn no lixo organico durante a compostagem, permitindo o entendimento das transforma  es no processo e potenciais riscos ambientais destes elementos.Os extratores utilizados na extra  o sequencial modificam as propriedades que influenciam fortemente na intera  o do metal com a fase s車lida, e as respectivas fra  es sol迆veis no in赤cio e final da compostagem, quanticadas por Espectrometria de Emiss o 車tica com fonte de plasma acoplado indutivamente - ICP OES. A sequencia dos extratores utilizada e as respectivas fra  es (in赤cio e fim da compostagem) foram: MgCl2 (fra  o sol迆vel 每 5 e 2% para Cu, 6 e 7% de Mn; <1 de Zn, 2 e 3% de Ni, 0,7 e 0,1% para Pb; 24 e 33% para Cd); CH3COONa (carbonato - 4, 3% para Cu, 24 e 28% de Mn; 25 e 20% para Zn, 6 e 7% de Ni,
%K Organic wastes
%K Composting
%K Ambient risk = Res赤duos organicos
%K Compostagem
%K Risco ambiental.
%U http://www.periodicos.rc.biblioteca.unesp.br/index.php/holos/article/view/2181/4462