| In order to discuss the effect of the freeze/thawing on the Cd adsorption ability of the soil and its mechanism, this paper studied the soil Cd adsorption ability（ｋｄ） under different freeze/thawing treatments and its influencing factors by artificial controlling temperature, indoor experiment and the method of correlation and path analysis. The result showed that the Henry model （Ｙ＝ａ＋ｋｄＣ） could imitate the progress of the cadmium static isothermal adsorption perfectly. The Cd adsorption ability of the soil firstly increased and then decreased with the freeze/thawing time increasing under the different soil water content. The change of the soil Cd adsorption ability with the soil water content was different under the different freeze/thawing time. The correlation of the Cd adsorption ability of the soil and the soil pH, cation exchange capacity（ＣＥＣ）， ｐｅｒｍａｎｅｎｔ ｃｈａｒｇｅ（ＣＥＣｐ）， ｄｉｓｓｏｌｖｅｄ ｏｒｇａｎｉｃ ｍａｔｔｅｒ（ＤＯＭ） ｗｅｒｅ ０．０１ ｏｒ ０．０５ ｓｉｇｎｉｆｉｃａｎｃｅ ｌｅｖｅｌ． Ｔｈｅ ｅffect of the soil pH, CECp, DOM on soil Cd adsorption ability was direct, while that of CEC was indirect. This study clearly demonstrated that the effect of the freeze/thawing on the soil pH, CECp, dissolved organic matter was the key reason for difference of soil Cd adsorption ability under the various freeze/thawing treatments. |
