Determination of cation exchange capacity by ammonium acetate method

The change of yin and yang is also characteristic in soil. The nature of soil is related to soil strength and people's livelihood, and cation exchange capacity is a key indicator to measure soil fertility. This ammonium acetate method is used to measure this amount, in order to clarify its method and observe the quality of the soil.

Take an appropriate amount of air-dried soil sample and place it in a clean container. Ammonium acetate solution is used as the extractant, and its concentration is precisely prepared and mixed with the soil sample according to a certain ratio. This ammonium acetate is a neutral salt solution, which can exchange cations on the surface of soil particles. Shake fully on the oscillator to make the two contact evenly and exchange complete.

Then, separate the soil liquid by an appropriate method, or by centrifugation, or by filtration, so that the clear liquid is clearly separated from the soil particles. The obtained clear liquid contains the exchanged cations.

For the determination of cations in the clear liquid, appropriate instruments and means can be selected according to the type of ions. For example, potassium and sodium plasma are measured by flame photometer, calcium and magnesium plasma are measured by atomic absorption spectrometer. Through accurate measurement, the content of each cation is obtained.

After series calculation, according to the specific formula of ammonium acetate method, the measured cation content is converted into cation exchange capacity. This value reflects the ability of the soil to maintain and supply fertilizer, and also provides an important basis for rational fertilization and soil improvement.

To operate this ammonium acetate method, it is necessary to be rigorous and serious, and all steps must be strictly adhered to, in order to obtain accurate results, which can add powerful help to soil research and agricultural production.