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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472
EISSN: 1735-2630
Vol. 3, No. 3, 2006, pp. 203-212
Bioline Code: st06027
Full paper language: English
Document type: Research Article
Document available free of charge

International Journal of Environment Science and Technology, Vol. 3, No. 3, 2006, pp. 203-212

 en Immobilization of lead by a vermicompost and its effect on white bean ( Vigna Sinenis var. Apure check for this species in other resources ) uptake
A. Carrasquero Durán, I. Flores, C. Perozo and Z. Pernalete

Abstract

Lead is one of the most dangerous contaminants which has been released to the environment during many years by anthropogenic activities. Adsorption of Pb2+ on vermicompost was studied at 11°C, 30 °C and 50 °C by using Langmuir and Freundlich models, that adequately described the adsorption process, with maximum adsorption capacities were 116.3; 113.6 and 123.5 μg/g for each temperature. The differences in FTIR (Fourier Transform Infrared Spectrometer) spectra of vermicompost at pH 3,8 and pH 7.0 in the region from 1800 to 1300 cm-1 were interpreted on the basis of carboxyl acid ionization that reduce band intensity around 1725 cm-1 producing signals at 1550 cm-1a) and 1390 cm-1a) of carboxylate groups. Similar changes were detected at pH 3.8 when ionic lead was present suggesting that heavy metal complexation occurs throughout a cationic exchange reaction. Vermicompost was applied to a soil where white bean plants were planted. After irrigation with lead nitrate solutions the uptake of lead was reduced to 81 % in leaves and stem, while the reduction in the roots was around 50 %. The highest accumulation of lead was found in the roots and the translocations seems to be limited by the presence off vermicompost in the soil.

Keywords
Lead, white bean, isotherms, FTIR, lead uptake

 
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