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Cu secondary adsorption by three variable charge soils collected from Hubei Province and Hunan Province was investigated. The amount of Cu secondary adsorption increased with that of SO42- elementary adsorption and conformed with the Langmuir, Freundlich and Temkin isotherms. Desorption of secondary-adsorbed Cu indicated that the hysteresis ratio decreased as Cu secondary adsorption increased, which meant that secondry-adsorbed Cu existed not only in the exchangeable form but also in the bridge form and specifically adsorbed form. The amount of Cu secondary adsorption increased with the temperature.
Cu secondary adsorption by three variable charge soils collected from Hubei Province and Hunan Province was investigated. The amount of Cu secondary adsorption increased with that of SO42- elementary adsorption and conformed with the Langmuir, Freundlich and Temkin isotherms. Desorption of secondary-adsorbed Cu that the hysteresis ratio decreased as Cu secondary adsorption increased, which meant that second baked-only adsorbed Cu existed only in the exchangeable form but also in the bridge form and additionally adsorbed form. The amount of Cu secondary adsorption increased with the temperature.