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Measurement method of cation exchange capacity in soil

A technology of cation exchange capacity and measurement method, which is applied in the field of determination of cation exchange capacity in soil, can solve problems such as complex operation process, low measurement results, and sample loss, and achieve the effects of good repeatability, accurate measurement, and simple operation

Active Publication Date: 2015-02-04
SICHUAN BRANCH OF CHINA TOBACCO
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Problems solved by technology

The pretreatment process of these previous methods is complicated and time-consuming; and the repeated manual treatment process can easily cause the loss of samples, resulting in low measurement results.

Method used

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Experimental program
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Embodiment Construction

[0041] The following will be described in conjunction with a specific embodiment.

[0042] 1. Instruments and reagents: FOSS Kjeltec 8400 distiller (FOSS company), VtexMixer 230VeU oscillator (US Labnet company); Sigma 3K15 centrifuge (Germany Sigma company), PH meter.

[0043] EDTA, ammonium acetate, ammonia water, glacial acetic acid, 95% ethanol, boric acid, methyl red, bromocresol green, magnesium oxide (analytical grade).

[0044] 2. Solution preparation

[0045] 2.1 Configure 0.005mol L －1 EDTA with 1mol L －1 Mixture of ammonium acetate: Weigh 77.09g of ammonium acetate (analytical pure) and 1.461g of ethylenediaminetetraacetic acid (analytical pure), add water to dissolve and wash them together into a 2000ml volumetric flask, add water to about 900ml, and mix with ammonia water and ice Adjust the acetic acid to pH 7.0 or pH 8.5, and then set the volume to the mark for later use. The EDTA-ammonium acetate mixture with a pH value of 7.0 is used for the extraction of ...

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Abstract

The invention discloses a measurement method of cation exchange capacity in soil. The method comprises the five steps of preparing a soil sample, carrying out exchange elution with an EDTA-ammonium acetate mixed solution and 95% alcohol, distilling by a full-automatic distiller, measuring by an instrument, and calculating. According to the method, optimization and improvement are carried out on soil sample extraction and leaching conditions, the full-automatic FOSSKjeltec8400 distiller is selected, relevant test conditions are optimized and screened, and concentration and volume conditions of absorption liquid are improved and optimized, so that the cation exchange capacity in the soil can be accurately measured. The method has the advantages of being simple and convenient as well as rapid and accurate in operation and good in repeatability.

Description

technical field [0001] The invention relates to an analysis method of cation exchange capacity, in particular to a method for measuring the cation exchange capacity in soil. Background technique [0002] Soil colloids make soil adsorptive due to their huge specific surface area and chargeability. In the diffusion layer of the soil colloidal electric double layer, the compensation ions can exchange equivalently with the ions of the same charge in the solution based on the ion valence, which is called ion exchange. Soil cation exchange capacity refers to the total amount of various cations that can be adsorbed by soil colloid, expressed in milligram equivalents of cations adsorbed on 100 g of dry soil. The size of the cation exchange capacity can be used as an index to evaluate the soil fertility. Cation exchange capacity is the main source of soil buffer performance and an important basis for soil improvement and rational fertilization. Therefore, it is very important to m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16G01N21/79G01N1/28
Inventor 陶晓秋熊巍杨雪黄玫
Owner SICHUAN BRANCH OF CHINA TOBACCO
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