Adsorption of Ammonium and Phosphate Ions and Effect of Ion Components in Groundwater by Aso Volcanic Ash Soil.

Sorption of Pesticides by Volcanic Ash Soil from Mt. Aso in "Simulated Weathering" Experiments

“…The other reagents were those used in the previous studies. 1,2) C, H, N analysis was performed using a C, H, N coder (Shimadzu Inc., Japan), and total organic carbon (TOC) analysis was performed using a TOC analyzer (Shimadzu Inc.). The other agricultural chemicals were analyzed using apparatus according to the previous studies.…”

“…The other agricultural chemicals were analyzed using apparatus according to the previous studies. 1,2) The particle-shaped diameter of ash soil and the surface area and pH which we used were 0.25 mm and 11.898 m 2 /g and pH 6.8. Adsorption Experiments Using Glass Columns ---The adsorption of 200 mg/l agricultural chemicals eluted through a conventional column (inner diameter, 10 mm; length, 250 mm) filled with 10 ash soil 1,2) was examined.…”

“…Aso (ash soil) may affect the quality of water in the regions where volcanic ash from the present crater in Naka-dake has been deposited. 1) We also reported that adsorption of Pesticides (Environmental standards and items requiring observation according to the Fundamentals of Environment Act) by ash soil may be affected by the water-solubility of chemicals and the kinds and number of hydrophilic functional groups at the molecular level of chemicals. 2) In the present study, we examined the changes in the adsorption of pesticides 3) listed on the Environmental standards and items requiring observation according to the Fundamentals of Environment Act by simulated weathering (simple sorption of humic acid).…”

“…We previously reported 1,2) that volcanic ash soil from Mt. Aso (ash soil) may affect the quality of water in the regions where volcanic ash from the present crater in Naka-dake has been deposited.…”

Adsorption of Phosphorus Infiltrating Andosol in Aso Caldera, Kumamoto

“…Chemical composition of Andosol in Aso region as follows; The percentage of SiO 2 , Al 2 O 3 , Fe 2 O 3 , CaO, Na 2 O, SO 3 , TiO 2 , K 2 O, Mn 2 O 3 were 55.5, 14.55, 13.78, 8.03, 3.11, 2.01, 1.56, 1.39, 0.207% respectively. In addition, Andosol has a lot of humus and has excellent water retention, water permeability and breathability [12]. In general, the phosphate absorption capacity of Andosol is high because large amounts of activated aluminum in Andosol adsorb and insolubilize phosphoric acid.…”