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Method for detecting organic matter in soil

A technology of organic matter and soil, which is applied in the direction of material analysis, special data processing applications, instruments, etc. by observing the influence of chemical indicators, and can solve problems such as difficult cleaning, oil pollution of laboratory air, and influence on sample oxidation efficiency.

Inactive Publication Date: 2009-04-29
SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, with the continuous improvement of modern scientific testing methods and the enhancement of people's awareness of environmental protection, analysis operators are increasingly aware of the inadvisability of the oil bath heating method: (1) The oil is volatile during the heat conduction process and pollutes the laboratory air, Affect the health of the operator; (2) if heated with an open flame, it is easy to ignite the volatile oil and cause a fire hazard; (3) the heating temperature fluctuates greatly, which affects the oxidation efficiency of the sample; (4) it is difficult to Cleaning, and in the cleaning process, if you accidentally bring the oil dirt outside the tube into the tube, resulting in high measurement results

Method used

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  • Method for detecting organic matter in soil
  • Method for detecting organic matter in soil
  • Method for detecting organic matter in soil

Examples

Experimental program
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Embodiment 1

[0046] Soil pretreatment follows the national standard method GB 9834-88. Select a representative air-dried soil sample, use tweezers to pick out organic residues such as plant roots and leaves, and then use a wooden stick to crush the soil clods to make them pass through a 1mm sieve. After fully mixing, take out 10-20g of the sample, grind it finely, pass it through a 0.25mm sieve, and put it into a grinding bottle for later use.

[0047] The heating device of the improved method of the present invention uses a digestion apparatus instead, and the digestion tube replaces the triangular flask to hold the sample and the reagent solution. When heating, a small funnel with a curved tail is covered on the top of the digestion tube, and the timing starts from the boiling of the solution. After 6-8 minutes Remove the digestion tube and let cool. Sodium diphenylamine sulfonate was used as indicator and FeSO 4 Titrate the remaining K 2 Cr 2 o 4 .

[0048] The accuracy of the two...

Embodiment 2

[0071] Use the method of the present invention to determine the content of organic matter in the standard soil sample GBW07412.

[0072] The specific implementation process:

[0073] Add 0.4g of standard soil sample (accurate to 0.0001g), Ag 2 SO 4 0.15g, accurately add 10ml0.10mol / l K with a pipette 2 Cr 2 o 7 -H 2 SO 4 solution, and then put the test tube in the aluminum ingot preheated to 180°C in advance, start timing from boiling, take out the test tube after 6 minutes, let it cool automatically, transfer it into a 250ml Erlenmeyer flask without loss, and wash the test tube 3 times with distilled water , add 3ml of 85% H 3 PO 4 and 4 drops of 0.5% sodium diphenylamine sulfonate indicator, and then use 0.2000mol / l FeSO 4 The standard solution was titrated until the solution turned bright green. Take 0.500g of powdered silicon dioxide instead of the sample, and other steps are the same as the sample determination.

[0074] The calculation process is the same as ...

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Abstract

The invention relates to measurement for organic substances in soil, in particular to a method for measuring organic substances in soil. The method comprises the following steps: using a digestion instrument to replace a heating device; using a digestion tube to replace a conical flask to receive samples and reagent solution; covering a small funnel with a bent part above the digestion tube when heating; timing from boiling of the solution; taking down the digestion tube after 6 to 8 minutes; cooling the digestion tube; and using sodium diphenylamine sulphonate as indicator to titrate residual K2Cr2O4. The method has the advantages of good repeatability, high reproducibility, simplicity and practicability.

Description

technical field [0001] The invention relates to the determination of organic matter in soil, in particular to an improved method for measuring soil organic matter. 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, organic matter content is usually used as an important indicator of soil fertility level (Document 1: Laojiata. Soil Agrochemical Analysis Handbook [M]. Beijing: Agricultural Press, 1988: 229-236; Document 2: Wen Xiaoqi. Soil Organic Matter Research Method [M]. Beijing: Agricultural Press, 1984: 19-37; Document 3: Nanjing Agricultura...

Claims

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Application Information

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IPC IPC(8): G01N21/79G06F19/00
Inventor 周桦宇万太张璐马强
Owner SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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