Leaching characteristics of naturally derived toxic elements from soils in the western Osaka area: considerations from the analytical results under the Soil Contamination Countermeasures Act

The analytical results of simple batch leaching test and bulk concentration test under the Soil Contamination Countermeasures Act were compiled for naturally derived toxic elements in the alluvial marine clay layer (Ma13) beneath western Osaka Plain, Japan. Leaching concentrations of Pb, F, and B were almost within 3-4 times of upper limit of Japanese regulations, while 50% of As concentration data were more than 3 times higher than the regulation value. Bulk concentrations of Pb, As, F and B suggested that these elements were derived from natural resources. These objective and quantitative data set should be utilized for adequately reusing excavated soils and to achieve sustainable soil managements.