Evaluation of relationship between dispersibility of soils and charge characteristics using a modified ion adsorption method; An example of soils from Wakayama Prefecture, Japan

Effect of removal of free oxides on changes in dispersibility and charge characteristics of soils

“…Charge characteristics. The amounts of negative and positive charges of the soil samples before and after the treatments were determined by the ion adsorption method described by Itami et al (1996). The pH range of equilibrated NaC1 solutions (0.05 and 0.01 mol L -1) was set from 3 to 7.…”

“…exchangeable cations, free oxides, or interlayered form) and/or the clay mineralogy markedly affected the colloidal behavior. It was also indicated that the differences in these properties were reflected on the charge characteristics, and it was found that the evaluation of the amount of soil charge by the ion adsorption method was effective to analyze the colloidal behavior quantitatively (Itami et al 1996).…”

Effect of Addition of Al Hydroxides on Changes in Dispersibility and Charge Characteristics of Soils

“…Charge characteristics. Amounts of negative and positive charges of the soil samples after the A1 addition treatment were determined by the ion adsorption method described by Itami et al (1996a). The samples were washed with 0.05 mol L -~ NaC1 twice prior to the measurement of charges.…”