Redistribution of Cs 137 introduced into montmorillonite in association with organic matter coming from biomass composting.
The adsorption and later bioavailability of 137Cs from the system humic acid (HA)/humic acid like compounds (HALC) and montmorillonite was investigated. The setup of the experiments should approach as much as possible natural conditions when 137Cs is introduced into soil with HALC from decomposed biomass. The significant differences were found in the trials containing various HA/HALC and also pure montmorillonite. The 137Cs was more available when it reached soil in association with HALC originated from compost than when it was adsorbed on stable humic acids. Moreover, the long term interaction of 137Cs with HALC led to decrease of 137Cs adsorbed on montmorillonite and increase of its bioavailable fraction. UV-Vis spectrometry and infrared spectroscopy showed the clear difference between HA, fresh HALC and old HALC which could partially explain the different results.
['Mihalik|J|J|', 'Madruga|M J|MJ|', 'Casimiro|M H|MH|', 'Ferreira|L M|LM|', 'Prudêncio|M I|MI|']
D001546:Bentonite D001682:Biological Availability D018533:Biomass D002588:Cesium Radioisotopes D000076282:Composting
Montmorillonite Bioavailability Humic acids Competitive adsorption Radiocesium