STUDY ON MECHANISM OF Cs TRANSPORT IN FOREST SOIL COSIDERING EXISTANCE OF COLLOIDS

Abstract

 In this study, we focus on potential colloid-facilitated transport in forest soils of radioactive Cs released by the Fukushima Daiichi Nuclear Power Plant accident in March 2011. We set the column experiments using colloidal Cs solution and dissolved Cs solution. The result of column experiments revealed that about 79% of resolved Cs flowed in soil adsorbed on soil and about 86% colloidal Cs flowed in soil effluent without delay caused by cation exchange. It was also revealed that flow peak in the case of 300mm/hr rainfall and 30mm/hr rainfall was appeared at almost the same moment but more Cs infiltrate into soil without adsorption in the case of 300mm/hr railfall.