Abstract
Leachates from sanitary landfills contain high concentrations of heavy metals. The potential pollution of groundwater by such leachates depends on the mobility of these metals. The metal’s mobility depends, to a large extent, on the size distribution of the ‘soluble’ heavy metal species, defined conventionally as being below 0.45 μ m. A dialysis membrane equilibration technique was used to determine the size distribution of ‘soluble’ Fe in such solutions and factors affecting it.
About 50% of the Fe precipitated out in an acidified solution, probably as Fe-humate. The oxidation of the humic material by H2O2 led to a marked increase in the low molecular size fraction. Another immobile fraction separated by the dialysis membrane was probably Fe(OH)3 colloidal particles. A complete mobilization of Fe was obtained with a combined treatment of H2O2 and HCl acidification.
Unlike Fe, most of the soluble Zn passed through the dialysis membrane. Acidification of the solution led to a complete mobilization of the Zn indicating that Zn binding to humic colloids is of low stability.
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© 1991 Springer Science+Business Media Dordrecht
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Ayalon, O., Nishri, A., Avnimelech, Y. (1991). Distribution of soluble iron and zinc in leachates of municipal wastes. In: Chen, Y., Hadar, Y. (eds) Iron Nutrition and Interactions in Plants. Developments in Plant and Soil Sciences, vol 43. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-3294-7_5
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DOI: https://doi.org/10.1007/978-94-011-3294-7_5
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