Method for calculating soil cation exchange capacity

A cation exchange capacity and soil technology, applied in the field of ion exchange capacity, can solve problems such as slow efficiency, time-consuming sample processing, and low results

Inactive Publication Date: 2014-07-02
中国国检测试控股集团青岛京诚有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, using this method, the sample processing is time-consuming and needs to be soaked overnight in advance. Each sample has to be processed at least 12 times. The experimental process is cumbersome, and it is all manually stirred, which consumes a lot of manpower. Only 8 samples can be analyzed in two days, which is very efficient. Slow, low results, poor accuracy

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  • Method for calculating soil cation exchange capacity
  • Method for calculating soil cation exchange capacity
  • Method for calculating soil cation exchange capacity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Existing standard sample test result: the soil cation exchange capacity is 21.6 ± 1.4cmol / Kg, respectively adopt the agricultural industry standard NY / T1121.5-2006 experimental method and the improved method of the present invention below, the accuracy of the two methods are compared :

[0025] 1 To adopt the experimental method of the agricultural industry standard NY / T1121.5-2006, repeat the operation twice:

[0026] (1) Weigh 2.0g sample, put it into a 100ml centrifuge tube, add 10ml0.05mol / L hydrochloric acid solution, add 0.25mol / L hydrochloric acid solution dropwise while stirring until carbon dioxide bubbles are not strongly generated, then add a sufficient amount of 0.05mol / L hydrochloric acid solution, soak overnight;

[0027] (2) Put the centrifuge tube into the centrifuge symmetrically, centrifuge at 3000-4000r / min for 5min, discard the supernatant, then add 0.05mol / L hydrochloric acid solution to the centrifuge tube to 60ml, stir for 5min, then centrifuge f...

Embodiment 2

[0053] The present embodiment respectively adopts the agricultural industry standard NY / T1121.5-2006 experimental method and the improved method of the present invention, and compares the precision of the two methods:

[0054] 1 is to adopt the experimental method of the agricultural industry standard NY / T1121.5-2006, and repeat the operation six times:

[0055] (1) Weigh 2.0g sample, put it into a 100ml centrifuge tube, add 10ml0.05mol / L hydrochloric acid solution, add 0.25mol / L hydrochloric acid solution dropwise while stirring until carbon dioxide bubbles are not strongly generated, then add a sufficient amount of 0.05mol / L hydrochloric acid solution, soak overnight;

[0056] (2) Put the centrifuge tube into the centrifuge symmetrically, centrifuge at 3000-4000r / min for 5min, discard the supernatant, then add 0.05mol / L hydrochloric acid solution to the centrifuge tube to 60ml, stir for 5min, then centrifuge for 5min , discard the supernatant, and repeat the treatment until...

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Abstract

The invention discloses a method for calculating soil cation exchange capacity. The method comprises the steps: 1, weighing a defined amount of samples, adding 50ml of 10.1mol / L ammonium fluoride solution, oscillating for 10min, and then filtering by using medium-speed filter paper to obtain filtrate; 2, sucking 10ml of filtrate and placing in a nitrogen fixing instrument boiling tube, distilling for 7min, and then titrating by using a hydrochloric acid standard solution; 3, calculating the cation exchange capacity of a soil sample according to the titration volume of the hydrochloric acid standard solution used in the step 2. The method has the beneficial effects that sample processing steps are simple, and oscillating and distilling steps are only required; no advanced soaking is required during sample treatment, the treatment time is only 17 min, at least 32 samples can be analyzed within two days; a result is within a standard value range, and the accuracy is relatively high.

Description

technical field [0001] The invention relates to a method for ion exchange capacity, in particular to a method for soil cation exchange capacity. Background technique [0002] Soil cation exchange capacity (cation exchange capacity or CEC) refers to the total amount of various cations that the soil colloid can absorb, and its value is expressed by the amount of substances containing various cations per kilogram of soil, that is, mol / kg. Soil cation exchange capacity affects the level of soil buffering capacity, and is also an important basis for evaluating soil fertility, improving soil and rational fertilization. [0003] At present, the cation exchange method in soil is determined according to the agricultural industry standard NY / T1121.5-2006. The basic principle is: the sample is first destroyed by 0.05mol / L hydrochloric acid solution, and then the sample is treated with 0.05mol / L hydrochloric acid. The exchangeable base is completely replaced in the soil to form a hydro...

Claims

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Application Information

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IPC IPC(8): G01N31/16G01N1/28
Inventor 栾建文吴鹏薛旭刘杰陈春锐时玉萍
Owner 中国国检测试控股集团青岛京诚有限公司
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