2024-03-29T07:35:35Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/610462018-09-10T11:24:30Zcom_10261_15com_10261_6col_10261_268
DIGITAL.CSIC
author
Celis, R.
author
Cox, L.
author
HermosÃn, M.C.
author
Cornejo, J.
2012-11-25T18:32:01Z
2012-11-25T18:32:01Z
1996
International Journal of Environmental Analytical Chemistry 65(1-4): 345- 260 (1996)
http://hdl.handle.net/10261/61046
10.1080/03067319608045559
Adsorption isotherms of metamitron on model soil colloidal components: kaolinite, illite, montmorillonite, iron oxide and humic acid, and their binary associations were obtained using a batch equilibration procedure. Sorption parameters, K-f and n(p) were calculated by fitting the sorption data to the Freundlich equation and results obtained for binary associations were compared with those obtained for the individual model components. The sorption efficiency of the humic acids and their binary associations was measured as Koc. The adsorption behaviour of the < 2 mu m fraction of two soils from Southern Spain was also studied as natural particulate matter. Montmorillonite and humic acids were found to be the most important components responsible for metamitronretention by the model. adsorbents studied. On the contrary, metamitron showed little interaction with kaolinite, illite or iron oxide. These individual adsorption behaviours were reproduced in the montmorillonite-iron oxide-humic acid binary systems, but with differences suggesting changes on the surface properties upon association. Differences in Koc values of isolated humic acids and their associations indicate that the interaction transforms the humic acid surfaces and suggest different types of bonding between colloids and metamitron. The results obtained with model adsorbents and their associations were in agreementwith the highest adsorption of metamitron found for the natural clay fraction of two soils which displayed the largest adsorption in that with the highest content in montmorillonite and organic carbon. The importance of organic matter and montmorillonite in metamitron adsorptionby colloidal components was also shown by the decrease in K-f and theincrease in Koc observed after removal of organic matter from the soil clay fraction with the highest organic carbon content.
eng
closedAccess
Retention of metamitron by model and natural particulate mater
artÃculo
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URL
https://digital.csic.es/bitstream/10261/61046/1/accesoRestringido.pdf
File
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accesoRestringido.pdf
URL
https://digital.csic.es/bitstream/10261/61046/5/accesoRestringido.pdf.txt
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text/plain
accesoRestringido.pdf.txt