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Determination 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 the problems of complex operation process, low measurement results, sample loss, etc., achieve accurate measurement results, simplify pretreatment and analysis steps, and operate easy effect

Inactive Publication Date: 2016-01-27
GUANGXI ZHUANG AUTONOMOUS REGION CENT FOR ANALYSIS & TEST RES
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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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  • Determination method of cation exchange capacity in soil
  • Determination method of cation exchange capacity in soil

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Embodiment

[0022] The assay method of cation exchange capacity in soil, concrete assay steps are as follows:

[0023] (1) Weigh 2.00g (accurate to 0.01g) of an air-dried soil sample passing through a 2mm sieve and place it in a 100mL centrifuge tube (weigh 5.00g (accurate to 0.01g) of a light soil sample), and add A small amount of 1mol / L ammonium acetate solution was used to stir the soil sample with a rubber-tipped glass rod to make it into a uniform mud state; then add 1mol / L ammonium acetate solution to a total volume of about 60mL, and stir well, and then mixed with 1mol / L acetic acid Wash the glass rod with rubber head with ammonium solution, and collect the washing liquid into the centrifuge tube;

[0024] (2) Put the centrifuge tubes in pairs on the two plates of the rack balance, and use 1mol / L ammonium acetate solution to make the mass balance, put the balanced centrifuge tubes into the centrifuge symmetrically, centrifuge for 4min, and the speed is 3500r / min ; If the exchange...

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Abstract

The invention discloses a determination method of the cation exchange capacity in soil. An ammonium acetate solution for air-dried soil sample is dissolved, uniform mixing is performed, a centrifugal machine is used for conducting centrifuging, and a supernate is taken; the ammonium acetate solution is used for repeated treatment; ethyl alcohol is added into lower-layer slurry, uniform mixing is performed, then the centrifugal machine is used for conducting centrifuging, the ethanol solution is removed, and the ethyl alcohol is used for repeated washing; after collection is performed, wax and magnesium oxide are added, distillation treatment is performed, a Nessler reagent is used for inspecting whether distillation is complete or not, a methyl red-bromocresol green mixing indication agent is added dropwise, and the hydrochloric acid standard solution is used for titration. According to the determination method, traditional methods are improved, the pretreatment and analysis steps are simplified, the sample treatment operation is more accurate in the whole determination process, and therefore the determination result is more accurate. The method has the advantages of being easy and convenient to operate, rapid, accurate and high in accuracy.

Description

technical field [0001] The invention relates to the technical field of ion measurement, in particular to a method for measuring 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 l00g 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 measure the catio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16G01N21/79
Inventor 黄一帆陈雪松陈桂鸾董秋健吴琼婧董金武李健王丹丹覃倢曾祥平韦柳玲王玉清夏娜韦如凤
Owner GUANGXI ZHUANG AUTONOMOUS REGION CENT FOR ANALYSIS & TEST RES
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