Soil humus extraction and purification method

A purification method and technology of humus, which is applied in the field of extraction and purification of soil humus, can solve the problems of low data comparability, achieve the effect of improving extraction yield, reducing production cost, and avoiding the consumption of manpower and material resources

Inactive Publication Date: 2017-01-11
HARBIN INST OF TECH
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Problems solved by technology

[0003] Due to the lack of standard methods, in the previous studies, the extraction methods of soil humus were different, and the selection of extraction agents, extraction liquid doses, extraction times, and purification methods had their own characteristics, which made the data comparability of the research low.

Method used

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  • Soil humus extraction and purification method
  • Soil humus extraction and purification method
  • Soil humus extraction and purification method

Examples

Experimental program
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Effect test

Embodiment 1

[0024] The humus in the soil of Inner Mongolia grassland area is extracted, and the implementation method is as follows:

[0025] Grassland soil pretreatment, the air-dried soil sample was ground through a sieve with a 2mm aperture, and mixed for use in experiments.

[0026] 1) Coarse separation of three components of grassland soil humus:

[0027] Weigh 55g of the above-mentioned soil sample passed through a 2mm sieve, place it in a 600ml centrifuge bottle, then add 550mL of 0.13M HCl and shake it well, empty the centrifuge bottle of 50mL of empty bottle volume, and promote the violent vibration of the liquid in the bottle during the shaking process. It is beneficial to fully contact the soil with the extractant and improve the extraction yield. Sonicate in a 150W ultrasonic cleaner at room temperature for 30min, then shake at a constant temperature of 25°C at a rate of 150rpm for 1h, and then centrifuge at a speed of 3500rpm for 30min. The residue in the lower layer contain...

Embodiment 2

[0038] The humic substances extracted from the above examples have deashed (DHA, DFA and DHu) and non-ashed (HA, FA and Hu) products, and their properties were analyzed by FTIR and titration experiments.

[0039] Take 1mg samples of each of DHA, HA, DFA and FA, mix each sample with 100mg of KBr, grind them thoroughly, press them into tablets and dry them in an infrared drying oven to remove the influence of water molecules in the samples. Measured on a Fourier transform infrared spectrometer, the measurement parameters are: resolution 4cm -1 , measuring range 4000-400cm -1 (see image 3 ).

[0040] Depend on image 3 It can be seen that humic acid and fulvic acid molecules have the same characteristic absorption peak, among which 3600-3100cm -1 The broad peaks are -OH (free or associated), -NH stretching shock absorption peaks, 2960cm -1 、2850cm -1 Symmetrical stretching vibration absorption peaks of methyl or methylene respectively, 1725cm -1 It is the carbonyl stretch...

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Abstract

The invention relates to a soil humus extraction method and concretely relates to a soil humus extraction and purification method. The method comprises carrying out full concussion and dissolution on a sample to be extracted orderly through hydrochloric acid and a sodium hydroxide solution so that dissolution of organic matters to be extracted in an acid solution and alkali lye is promoted and carrying out separation and purification to obtain different humus substances of the sample to be extracted. The method improves a standard method provided by the international humic substances society, has simple processes and has good applicability. The extract obtained by the soil humus extraction method satisfies international humic substances society requirements. The method realizes maximized separation of products from soil without influence on a substance structure.

Description

technical field [0001] The invention relates to a method for extracting humus in soil, in particular to a method for extracting and purifying soil humus. Background technique [0002] The quantitative extraction, separation and purification of soil humus is an important prerequisite for in-depth study of soil humus. There are many reports on the methods of humus extraction in soil, including organic solvent extraction, inorganic reagent extraction and organic / inorganic reagent mixed extraction. Acetone, DMSO, Pyridine, dioxane and other organic solvents extract humic substances with low extraction yields, and the products are mostly organic matter with small molecular weight, and some organic extractants are finally difficult to completely separate from organic matter (Hayes, Eloff, etc.). Mixed extractant Na 4 P 2 o 7 and EDTA extraction method, the productive rate is higher than the organic solvent method, but the ash content in the extraction product is very large. I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16G01N1/34
Inventor 张立珠毛静春赵青张思玉张海荣宋薇
Owner HARBIN INST OF TECH
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