Resumo

SANCI, Romina; OSTERA, Héctor A.  e  PANARELLO, Héctor O.. Measurement CO₂ fluxes from antropicsource: Municipal final disposition site, Gualeguaychú, Entre Ríos. Rev. Asoc. Geol. Argent. [online]. 2009, vol.65, n.3, pp.533-544. ISSN 0004-4822.

Direct measurement of surface CO₂ emissions(CO₂ fluxes) represents an effective tool to estimate thecontribution of greenhouse gases to atmosphere from individual sources. In thiswork, the authors report the first results of surface CO₂ fluxesfrom a waste municipal final disposition site in Gualeguaychú, Entre Ríos. Itwas applied the accumulation chamber method which was calibrated in laboratorybefore the land measurements. Three surveys at different scale sample werecarried out (25, 50 y 100 m). Soil CO₂ fluxes range from 5 to 331g/m² day. Using statistical analysis three different populationswere distinguished (background soil gases and anomalous values) and the totalgas emissions from the site was calculated. The soil CO₂, CH₄,O₂ and N₂ concentrations, the time and depth emplacementof waste, the materials no compacted and meteorological conditions, suggestthat the site had passed all waste biodegradation phases. Actually, it could beat final stage. The d¹³C of soil CO₂ (-34,2‰ y-17,6‰) as the dissolved inorganic carbon (DIC) and the d¹³C ofDIC (-12‰ a -0,6‰) of groundwater samples show that actual process oscillatebetween aerobic and anaerobic oxidation phases.

Palavras-chave : CO₂ fluxes; d¹³C; waste final disposition site.

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