| Popis: |
Physical properties were examined about Aso volcanic ash soil which is considered to be the origin of Kuroboku soil in Kumamoto prefecture. It is revealed that the volcanic ash soil is low in Al2O3 ratio which means its capability of becoming "active Al", and is large in pore size and small in specific surface area. The adsorption of ammonium and phosphate ions on the Aso volcanic ash soil and accompanying elution of constituent elements were examined by passing a NH4H2PO4 solution (1-3300μg/ml) through a column (10 cm diameter and 75 cm long) of the soil sample. The adsorbed amounts of NH4+ and PO43- were 0.042 and 0.688 mg/g, respectively. Na+, K+, Ca2+, Mg2+, and SO42- were eluted from the ash soil were observed during the adsorption reaction by use of 1μg/ml of the NH4H2PO4 solution. |
