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用三种方法测定了17个酸性森林土壤和近中性农业土壤的阳离子交换量,以进行方法比较。这种新的方法是以0.1M BaCl_2置换全部阳离子,土壤经 BaCl_2饱和后,用 MgSO_4或 MgCl_2去置换土壤上的可交换 Ba(强制交换)。结果表明,用这一方法测定阳离子总量(Ca、Mg、Na、K 及 Al、Mn、Fe)与其它方法具有相同的结果。这种一步完成的简单方法可以推荐用于酸性土壞的常规分析,特別在非农用土地的勘查中加以应用。
Three methods were used to determine the cation exchange capacity of 17 acidic and near neutral agricultural soils for comparison. The new method is to replace all the cations with 0.1M BaCl 2. After the soil is saturated with BaCl 2, the exchangeable Ba (forcible exchange) on the soil is replaced with MgSO 4 or MgCl 2. The results show that the total amount of cations (Ca, Mg, Na, K, Al, Mn, Fe) determined by this method has the same result as other methods. This simple, one-step approach can be recommended for routine analysis of acid soils, especially for non-agricultural land surveys.