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Method for rapidly determining content of organic matter in soil

A technology for rapid determination of organic matter content, applied in the preparation of test samples, chemical analysis by titration, etc., can solve the problems of no unified measurement standard, uneven heating of samples, and limited use range, etc., to achieve low cost, Effect of short heating time, improved precision and readiness

Inactive Publication Date: 2017-01-04
农业部亚热带果品蔬菜质量监督检验测试中心 +1
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, in the process of burning off, the weight of the sample decreases, not only including the organic matter content, but also the bound water in the sample, which makes the measurement result higher
(4) Soil spectrometry, although it is convenient and fast to operate, is suitable for rapid estimation of organic matter, but in the process of spectroscopic measurement, there is no unified measurement standard, and the results will be different due to different sample processing methods, and the price of the spectrometer is relatively high. limit its use
The improved potassium dichromate oxidation method still has poor temperature control accuracy, slow heat transfer rate, uneven heating of the sample, the need to transfer the sample many times during the test, and the need to consume expensive Ag 2 SO 4 , Toxic Hg 2 SO 4 Disadvantages such as chemical reagents, high cost, large pollution, and large errors in the measurement results

Method used

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  • Method for rapidly determining content of organic matter in soil
  • Method for rapidly determining content of organic matter in soil
  • Method for rapidly determining content of organic matter in soil

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Take 12 soil samples from different locations in Guangxi, and use an elemental analyzer to measure the organic matter content of the samples in the range of 20 to 32g / kg. Take 3 samples from each sample for the test, and take the average of the results. All samples are tested in the same batch. The specific operation steps are as follows:

[0043] (1) Soil pretreatment: the soil sample is air-dried, pulverized, and passed through a 0.25mm sieve for subsequent use to obtain a soil sample;

[0044] (2) Digestion: Add 0.05g (accurate to 0.0001g) of soil sample to each digestion tube with a capacity of 100mL, and add 0.1g of bismuth nitrate, and then add 10mL of bismuth nitrate with a concentration of 0.4mol / L Potassium dichromate-concentrated sulfuric acid solution and 3mL of concentrated phosphoric acid, then place the digestion tube in the above-mentioned digestion device that has been preheated to 180°C, remove the sealing sheet, put the digestion tube into the digestio...

Embodiment 2

[0064] Six soil samples were taken from different locations in Guangxi, and the organic matter content of the samples was measured by an elemental analyzer in the range of 8-13g / kg. Three samples were taken from each sample for the test, and the results were averaged. All samples were tested in the same batch. The specific operation steps are as follows:

[0065] (1) Soil pretreatment: the soil sample is air-dried, pulverized, and passed through a 0.25mm sieve for subsequent use to obtain a soil sample;

[0066] (2) Digestion: Add 0.5g (accurate to 0.0001g) of soil sample to each digestion tube with a capacity of 100mL, add 0.3g of bismuth nitrate, and then add 15mL of bismuth nitrate with a concentration of 0.4mol / L Potassium dichromate-concentrated sulfuric acid solution and 5mL of concentrated phosphoric acid, then place the digestion tube in the above-mentioned digestion device that has been preheated to 180°C, remove the sealing sheet, and move the sealing sheet to cover ...

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Abstract

The invention discloses a method for rapidly determining the content of organic matter in soil. The method comprises steps as follows: 0.05-0.5 g of a soil sample is weighed and added to a digestion tube, 0.1-0.3 g of bismuth nitrate is added, and 10-15 mL of a potassium dichromate-concentrated sulfuric acid solution with the concentration being 0.4 mol / L and 3-5 mL of strong phosphoric acid are added; the digestion tube is placed in a digestion device provided with a graphite heating plate and suitable for simultaneous digestion of large batches of determined samples, accurate heating at 180 DEG C is performed, and organic carbon in the soil is oxidized; residual potassium dichromate in the digestion tube is titrated with a ferrous sulfate standard solution under electromagnetic stirring; then the amount of potassium dichromate consumed by the sample is multiplied by an oxidation correction coefficient, and the content of the organic matter in the soil is calculated. The method has the advantages of being high in accuracy, good in repeatability, simple to operate, low in energy consumption, low in cost, capable of saving time and labor, reliable in determined results and the like.

Description

technical field [0001] The invention relates to the technical field of soil organic matter measurement, in particular to a method for quickly measuring soil organic matter content. Background technique [0002] Soil organic matter is the main source of various nutrients in the soil, especially nitrogen and phosphorus. It can make the soil have fertility and buffer properties, loosen the soil and form a structure, thereby improving the physical and chemical properties of the soil. It is the basis for soil classification. one. In addition, the biological characteristics of the soil will also change with the quantity and quality of soil organic matter. Therefore, the organic matter content is usually used as an important indicator of the level of soil fertility. The determination of soil organic matter can understand the dynamic change characteristics of organic matter, which is the basic condition for agricultural production management, precision agriculture, and sustainable...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/44G01N31/16
CPCG01N1/44G01N31/16
Inventor 甘志勇彭靖茹苏展邹源覃少麟陆仲烟农耀京秦玉燕李乾坤时鹏涛王运儒
Owner 农业部亚热带果品蔬菜质量监督检验测试中心
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