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Purification method of humin in soil

A purification method and soil technology, applied in solid solvent extraction and other directions, can solve the problems of incomplete removal, high HM ash content, incomplete HM extraction, etc., and achieve the effect of low ash content

Active Publication Date: 2021-02-23
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the extraction methods of soil HM generally have incomplete HM extraction, a large amount of HM adsorbed and wrapped with soil minerals cannot be extracted, HM has a high ash content, FA and FA in soluble organic matter (such as ether, acetone, acetonitrile and ethanol) in HM HA is not removed or removed incompletely, which cannot meet the needs of scientific research on soil organic matter

Method used

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  • Purification method of humin in soil
  • Purification method of humin in soil
  • Purification method of humin in soil

Examples

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Embodiment 1-5

[0052] A kind of purification method of humin in embodiment 1-5 soil

[0053] The main step parameters of the method for purifying humin in the soil described in Examples 1-5 are shown in Table 1.

[0054] Table 1

[0055]

[0056]

[0057] Concrete purification method: comprise the following steps:

[0058] 1. Weigh 100g of air-dried soil sample, grind it through a 80-300 mesh sieve, and obtain solid substance 1;

[0059] 2. Add 1 L of distilled water to solid substance 1, stir for 24 hours, centrifuge, discard the supernatant, and obtain solid substance 2;

[0060] 3. Add 1 L of nitric acid with a concentration of 0.08-0.2 mol / L to the solid substance 2, centrifuge after stirring for 24 hours, discard the supernatant, and obtain the solid substance 3;

[0061] 4. Add 1 L of distilled water to solid substance 3, stir for 24 hours, centrifuge, and discard the supernatant to obtain solid substance 4;

[0062] 5. Add 1 L of sodium pyrophosphate solution with a concentr...

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Abstract

The invention discloses a method for purifying humin in soil, which comprises the following steps: ground and sieved a soil sample, washed with water, acidic, alkali washed, mixed pickling, Soxhlet extraction, mixed pickling, washed with water and freeze-dried to obtain humin solid. Compared with the prior art, the humin obtained by the invention has a low ash content of only 0.570-0.725%, which can meet the needs of scientific research on soil organic matter and provide technical support for scientific research on soil organic matter.

Description

technical field [0001] The invention belongs to the technical field of extracting organic matter in soil, and in particular relates to a method for extracting and purifying humin in soil. Background technique [0002] Soil organic matter is an important part of soil and plays an important role in soil fertility, environmental protection, and sustainable agricultural development. As the main body of soil organic matter, humic matter has been widely valued by scholars from all over the world. According to the traditional grouping method, humic substances include humic acid (HA), fulvic acid (FA) and humin (humin, HM), among which HA is soluble in alkali but insoluble in water and acid; FA is soluble in both alkali, water and acid; while HM is neither soluble in alkali nor water and acid. Therefore, HM is now commonly defined as a humic substance component that is insoluble in aqueous solutions at any pH condition. HM is an independent humic substance component different fro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08H7/00B01D11/02
CPCB01D11/02C08H6/00
Inventor 李晓倩白英臣魏永杰李志刚王占山钱岩王孜晔郭辰朱晓晶
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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