土壤中陽離子交换量的测定,一般多採用醋酸銨淋洗法。但此法手續甚繁,費時既多,而試品用量亦大,對於少量樣品如土壤膠體的研究,很感困難。所以,土壤陽離子交換量的半微量速測的實用方法甚為急需。醋酸銨淋洗法也有許多缺點,腐殖質可与醋酸銨形成腐殖酸铵而溶解於醋酸銨中(一般改用醋酸鋇為淋洗劑),另外有機質中的氮化合物在鹼性溶液中一部分 Determination of cation exchange capacity in the soil, the general use of ammonium acetate leaching method. However, this method is very complicated and time-consuming, while the amount of the test is also large, for a small amount of soil samples such as colloidal research, very difficult. Therefore, the soil cation exchange rate of semi-trace speed practical method is urgently needed. Ammonium acetate leaching also has many shortcomings. The humus can form ammonium huminate with ammonium acetate and dissolve in ammonium acetate (usually using barium acetate as eluent). In addition, the nitrogen compound in organic matter is partly dissolved in alkaline solution