Method for detecting organic matters in soil through potassium dichromate oxidation process

A technology of potassium dichromate oxidation and potassium dichromate, applied in the preparation of test samples, chemical analysis by titration, etc., can solve the problems of time-consuming, increased workload, and high results, so as to reduce the risk of experiments, The effect of easy implementation and reliable implementation

Inactive Publication Date: 2013-01-30
谱尼测试集团股份有限公司
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Problems solved by technology

This method has three disadvantages: one is that the settling time is longer; the other is that due to the addition of concentrated sulfuric acid during oxidation, the centrifugation needs to be transferred once, which is potentially dangerous, time-consuming, and increases the workload.
Third, if the settlement of the solution after oxidation is not very clear, it will lead to higher results

Method used

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  • Method for detecting organic matters in soil through potassium dichromate oxidation process
  • Method for detecting organic matters in soil through potassium dichromate oxidation process
  • Method for detecting organic matters in soil through potassium dichromate oxidation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Detection of Liaoning brown soil (ASA-1a) (standard value: 10.0±0.5g / kg)

[0025] Accurately weigh about 0.5 g of air-dried soil sample passing through 100 mesh into a glass tube, add 5 mL of 1.0085 mol / L potassium dichromate standard solution, 5 mL of concentrated sulfuric acid, and heat in a boiling water bath for 40 min. Take it out, and after cooling down slightly, wash all the mixture in the glass tube into a 250mL Erlenmeyer flask to make the inner volume of the bottle 60-80mL, add 3 drops of o-phenanthroline indicator, and titrate with 0.2mol / L ferrous sulfate solution. The discoloration process of the solution is from orange-yellow to blue-green to brown-red. The result is calculated according to formula (1), and the result is as follows:

[0026]

Embodiment 2

[0028] Detection of paddy soil (ASA-4a) in Hubei (standard value: 33.3±1.0g / kg)

[0029] Accurately weigh about 0.3 g of air-dried soil sample passing through 100 mesh into a glass tube, add 5 mL of 1.0085 mol / L potassium dichromate standard solution, 5 mL of concentrated sulfuric acid, and heat in a boiling water bath for 40 min. Take it out, and after cooling down slightly, wash all the mixture in the glass tube into a 250mL Erlenmeyer flask to make the inner volume of the bottle 60-80mL, add 3 drops of o-phenanthroline indicator, and titrate with 0.2mol / L ferrous sulfate solution. The discoloration process of the solution is from orange-yellow to blue-green to brown-red. The result is calculated according to formula (1), and the result is as follows:

[0030]

[0031] Obviously, those of ordinary skill in the art can use the potassium dichromate method of the present invention to measure the content of organic matter in soil.

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Abstract

The invention relates to a method for detecting organic matters in soil through a potassium dichromate oxidation process, which comprises the steps of weighing a test sample, adding 5mL of 0.9 to 1.1mol/L of potassium dichromate standard solution and 5mL of concentrated sulfuric acid, and heating the test sample in a boiling water bath for 35 to 40 min; completely absorbing the cooled mixture into a conical flask with 250mL, adding a phenanthroline hydrate indicator, and using a ferrous sulfate solution to titrate to an end point. The method for detecting the organic matters in the soil through the potassium dichromate oxidation process optimizes the concentration of the potassium dichromate standard solution and the influence of the heating temperature and time on a detection result. The method provided by the invention is adopted to detect the content of the organic matters in the soil accurately and reliably, and the relative mean variation is less than 10%. Thus, according to the method provided by the invention for detecting the contents of the organic maters in the soil, a method which is reliable and convenient to realize is provided to meet the requirements in research and production.

Description

technical field [0001] The invention relates to a method for measuring organic matter in soil, in particular to a method for detecting organic matter in soil by potassium dichromate oxidation. Background technique [0002] Soil is the basic means of production in agricultural production, and the plant products produced in agriculture are the most fundamental source of material and energy for the survival of human beings and animals. Plant production must rely on the supply of various minerals from the soil. The various substances produced by the soil are not only the means of subsistence for human survival, but also the material basis of the breeding industry. [0003] Soil organic matter is an important source of various nutrients in the soil, especially nitrogen and phosphorus. It also contains humic acid and other substances that promote plant growth. Because of its colloidal characteristics, it can absorb more cations, so that the soil has fertility and buffering prope...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16G01N1/44
Inventor 宋薇
Owner 谱尼测试集团股份有限公司
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