%0 Journal Article
%T Avalia  o do Potencial T¨®xico de Latossolos e Chernossolos Acrescidos de Lodo de Esgoto Utilizando Bioensaios com Oligoquetas da Esp¨¦cie Eisenia andrei.
%A Ricardo Gon£¿alves Cesar
%A Silvia Gon£¿alves Egler
%A Renata de Carvalho Jimenez Alamino
%A Helena Polivanov
%J Anu¨¢rio do Instituto de Geoci¨ºncias
%D 2008
%I Universidade Federal do Rio de Janeiro
%X Sewage Sludge (SEL) has been used in agricultural activities to improve physical and chemical properties of soils. However, thiscompound also contains very high levels of heavy metals and pathogenic microorganisms, which can cause serious negative effects onbiota and human health. This paper aims to assess potential toxicity of latosols and chernosols amended with SEL, using Eisenia andreiearthworms. Acute toxicity and behavioral tests were performed according to ASMT (2004) and ISO (2002) procedures, respectively.Heavy metals determination was made by Atomic Absorption, and mineralogical characterization by Ray-X Difratometry. Biomass losswas evaluated considering average individual weight. Mercury, lead, zinc and cooper determination in SEL in natura and soils amendedwith SEL revealed values higher than that recommended by Brazilian legislation. SEL addition to the soils caused no mortality to theorganisms, while SEL in natura provoked lethal effects on 100% of the earthworms. Latosol in natura demonstrated higher mortalityin comparison to chernosol in natura Behavioral tests indicated that 98,3% and 96,43% of the organisms avoided SEL in natura andlatosol with SEL, respectively. However, only 31% of the organisms avoided chernosol with SEL, suggesting a lower level of toxicity incomparison to latosol. Possibly the natural properties of the studied soils (fertility, organic matter content, clay mineralogy, etc.) playedan important role in the avoidance behavior of the organisms. Probably expansive clays presence in chernosol stimulates ions adsorptionand their concentrations decreasing in soil solution; consequently contaminants bioavailability also tends to decrease. Biomass loss resultsrevealed that the SEL addition decreased the weight loss of the tested organisms, and biomass losses were higher for latosol than forchernosol. In conclusion, it is expected that these results can be used in human health and ecological risk assessment, as well as insustainable reconditioning of tillable soils, facilitating decision actions in environmental control and public health programs.
%K Environmental risk
%K earthworms
%K sewage sludge
%K toxic metals
%K soils
%U http://www.anuario.igeo.ufrj.br/anuario_2008_2/2008_2_53_60.pdf