论文部分内容阅读
在紫色水稻土Ｋ~＋，ＮＨ_４~＋互交换中，解吸量大于吸附量。吸附量和解吸量Ｋ~＋均高于ＮＨ。ＮＨ对土壤Ｋ~＋的交换释放大于Ｋ~＋对土壤ＮＨ的交换释放。Ｋ~＋，ＮＨ的交换性吸附和解吸等温曲线能很好地吻合Ｌａｎｇｍｕｉｒ方程，参数Ｋ值的正负号，取决于吸附或解吸过程。土壤Ｋ~＋的互交换均为吸热反应，△Ｈ°分别为０．１１～３３．９８ＫＪ／ｍｏｌ和４０．３９～６５．８２ＫＪ／ｍｏｌ。土壤Ｋ~＋，ＮＨ的互交换，包含了物理化学吸附的机理。温度升高，可使交换反应的△Ｇ°由正值转为负值，促进了交换反应的进行。交换反应为熵增过程，土壤固相中Ｋ~＋和ＮＨ排列的有序程度下降，混乱程度增大。
In the purple paddy soil K ~ +, NH_4 ~ exchange each other, the amount of desorption is greater than the amount of adsorption. Adsorption and desorption K ~ + were higher than NH. The exchange release of NH + to K + was greater than that of K + to exchange NH +. The exchangeable adsorption and desorption isotherms of K ~ + and NH can well fit the Langmuir equation. The sign of the parameter K value depends on the adsorption or desorption process. The reciprocal exchange of soil K ~ + was endothermic with △ H ° of 0.11 ~ 33.98KJ / mol and 40.39 ~ 65.82KJ / mol, respectively. Soil K ~ +, NH exchange each other, including the physical and chemical adsorption mechanism. With the increase of temperature, the △ G ° of the exchange reaction can be changed from positive value to negative value, which promotes the exchange reaction. The exchanging reaction is the entropy increasing process. The ordered degree of K ~ + and NH arranged in the soil solid phase decreases, and the degree of disorder increases.