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A Fast and Simple Method for Molecular Weight Fractionation of Humic Acid

A grading method, humic acid technology, applied in chemical instruments and methods, color/spectral characteristic measurement, other chemical processes, etc., can solve the problems of high requirements for instruments and equipment, long time-consuming grading, difficult to obtain, etc., and meet the requirements of experimental equipment Effects of low, improved classification efficiency, and easy handling

Active Publication Date: 2019-03-29
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All of the above inventions can realize the grading of the molecular weight of humic acid, but there are still problems such as high requirements for the required equipment and difficult to obtain, complicated operation, high cost, and long time-consuming grading.

Method used

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  • A Fast and Simple Method for Molecular Weight Fractionation of Humic Acid
  • A Fast and Simple Method for Molecular Weight Fractionation of Humic Acid
  • A Fast and Simple Method for Molecular Weight Fractionation of Humic Acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A method for grading the molecular weight of humic acid, comprising the steps of:

[0037] S1. Put 40mg of nanometer iron ferric oxide into 500-1000Da, 3500Da, 9000Da, 10000Da, 15000Da, 25000Da, 35000Da, 50000Da, 90000Da 9 molecular weight grade regenerated cellulose membranes respectively, and wrap both ends of the membrane with membrane Clamp and clamp to make 9 film packs with different molecular weight grades;

[0038]S2. Add 50mg of humic acid into a 500ml volumetric flask, add 1M NaOH solution dropwise therein until the humic acid is completely dissolved, set the volume to 500ml with deionized water, adjust the humic acid with concentrated hydrochloric acid of 39% by mass The pH of the solution was 5.0, and the membrane bag with the smallest molecular weight grade was added thereto, and stirred at 120 rip / min at 20-25° C. for 1 h in stages.

[0039] S3. After the film bag adsorption reaction is completed, take out the film bag, and measure the concentration of th...

Embodiment 2

[0050] A humic acid molecular weight classification method, comprising the steps of:

[0051] S1. Put 60mg of nanometer iron ferric oxide into 500-1000Da, 3500Da, 9000Da, 10000Da, 15000Da, 25000Da, 35000Da, 50000Da, 90000Da 9 molecular weight grades of regenerated cellulose film respectively, and wrap both ends of the film with film Clamp and clamp to make 9 film packs with different molecular weight grades;

[0052] S2. Add 50mg of humic acid into a 500ml volumetric flask, add 1M NaOH solution dropwise therein until the humic acid is completely dissolved, set the volume to 500ml with deionized water, adjust the humic acid with concentrated hydrochloric acid of 39% by mass The pH of the solution is 5.0, add the membrane bag with the smallest molecular weight grade to it, and stir in stages at 120rip / min at 20-25°C for 0.5h;

[0053] S3. After the film bag adsorption reaction is completed, take out the film bag, and measure the concentration of the humic acid solution outside ...

Embodiment 3

[0064] A humic acid molecular weight classification method, comprising the steps of:

[0065] S1. Put 60mg of nanometer iron ferric oxide into 500-1000Da, 3500Da, 9000Da, 10000Da, 15000Da, 25000Da, 35000Da, 50000Da, 90000Da 9 molecular weight grades of regenerated cellulose film respectively, and wrap both ends of the film with film Clamp and clamp to make 9 film packs with different molecular weight grades;

[0066] S2. Add 80mg of humic acid in a 500ml volumetric flask, add 1M NaOH solution dropwise therein until the humic acid is completely dissolved, set the volume to 500ml with deionized water, and adjust the humic acid with concentrated hydrochloric acid of 39% by mass The pH of the solution was 5.0, and the membrane bag with the smallest molecular weight grade was added thereto, and stirred at 120 rip / min at 20-25° C. for 1 h in stages.

[0067] S3. After the film bag adsorption reaction is completed, take out the film bag, and measure the concentration of the humic ac...

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Abstract

The invention provides a rapid and simple humic acid molecular weight grading method which grades molecular weight of humic acid by means of adsorption of nano ferroferric oxide and permeability of aregenerative cellulose membrane. The method specifically comprises the following steps: putting the prepared nano ferroferric oxide in the regenerative cellulose membrane to form a membrane bag; and providing power by means of adsorptivity of nano ferroferric oxide to humic acid, wherein humic acid, the molecular weight of which is smaller than that of the regenerative cellulose membrane penetrates the membrane while humic acid and nano ferroferric oxide, the molecular weight of which are greater than that of the regenerative cellulose membrane, are intercepted out of the membrane, thereby achieving the purpose of grading the molecular weight of humic acid by adding the membrane bags of different molecular weights successively from small to large. The method has the beneficial effects thatthe method is simple to operate and convenient and rapid, used materials are non-toxic and harmless and environment-friendly, and the method provides a technical support for further researching structure, composition and property of humic acid.

Description

technical field [0001] The invention belongs to the technology of comprehensive treatment of polluted water body and water body ecological restoration, and in particular relates to a fast and simple method for grading the molecular weight of humic acid. Background technique [0002] Humus is the most widely distributed organic matter in nature. It is widely found in soil, sediment, rivers, lakes and oceans. It is the product of animal and plant residues formed through chemical and biological processes. Humus is involved in the process of global carbon cycle in large quantities, accounting for 50%-90% of dissolved organic carbon in fresh water. Humus plays an important role in water bodies and soils due to its ability to react with various compounds in the environment. [0003] Humic substances are a mixture of macromolecular organic substances with various functional groups, which can be divided into three types according to their solubility in aqueous solution: fulvic acid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/33B01J20/02B01J20/30C02F1/28
CPCB01J20/0229C02F1/281G01N21/33
Inventor 赵天慧汤智赵晓丽吴丰昌
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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