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In general, this leads to a significant decrease of pH and EC in soils and ashes. The effect of rainfall showed a contrasting situation between soils and ashes, since EFsoil remained one or slightly above and EFash was below one. That Hg reduction in the ashes, which reached 30 to 60%, was accomplished with a decrease of LOI between 50 and 70%. Presumably, runoff promoted the removal of particulate Hg or solubilised the forms attached to the organic matter in ashes.