Separation and purification method of humus in wetland sediment

A purification method and sediment technology, applied in organic chemistry and other directions, can solve the problems of low extraction rate, high concentration of extractant, and time-consuming extraction and separation process for several hours, so as to improve the extraction efficiency and separation purity, and shorten the extraction time. Effect

Inactive Publication Date: 2011-12-28
SHANGHAI UNIV
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Problems solved by technology

The concentration of the extractant used is high, the extraction and separation process takes several hours and the extraction rate is low

Method used

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  • Separation and purification method of humus in wetland sediment
  • Separation and purification method of humus in wetland sediment
  • Separation and purification method of humus in wetland sediment

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Experimental program
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Embodiment Construction

[0022] 1. Materials

[0023] 1. Wetland sediment sampling,

[0024] (1) Sediment sampling location: Huangpu River-Yangtze River estuary coastal wetland (N31°23’5.4’’ E121°30’28.3’’) sediment;

[0025] (2) Sediment collection and processing: Select the wetland sediment sampling area, set sampling points at intervals of 10m vertically and parallel to the river water direction, collect samples of 0-10cm and 10-20cm of the surface layer of the sediment respectively, and collect samples at the intersection of the vertical and parallel directions The section sediment samples were collected at an interval of 10 cm in the vertical direction downward; the collected sediment samples were removed from residual roots and debris, air-dried, and passed through a 100-mesh sieve for later use.

[0026] (3) Basic physical and chemical properties of the sediment: pH 7.93, organic matter 7.08g / kg, clay content 26.14%, Kjeldahl nitrogen content 635.71 mg / kg, phosphorus content 913.97 mg / kg, pota...

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Abstract

The invention relates to a method for separating and purifying humus in wetland sediments. The specific steps of the method are as follows: after the wetland sediment is pretreated, it is passed through a 100-mesh sieve; an alkali extract solution with a pH value of 13 is prepared and shaken at a constant temperature at 70° C. for 1 hour to extract humus in the wetland sediment; centrifugal separation and filtration are obtained. The supernatant is the alkali extractable liquid HE, and the obtained filter residue is the crude humic substance humin HM; adjust the pH value of the extractable liquid HE obtained in the alkali step b to 1.0-1.5, and centrifuge; filter the obtained supernatant with medium-speed quantitative filter paper That is, the fulvic acid FA solution is obtained; the obtained precipitate is dissolved with 0.1mol/L NaOH and filtered with a medium-speed quantitative filter paper to obtain the humic acid HA solution; a mixture of 1mol/LHCl and 10% HF by volume is added to the filter residue obtained in step b solution, filter residue and mixed solution weight volume ratio is 1:5, microwave heating with 30W power for 10min, remove the supernatant, rinse the residue with distilled water to obtain humin HM; the above fulvic acid FA solution, humic acid HA The solution and Humin HM were dried. The method for separating and purifying humus in wetland sediments of the invention is simple, fast, effective, easy to operate, low in cost and good in effect.

Description

technical field [0001] The invention relates to a method for separating and purifying humus in wetland sediments. Background technique [0002] Soil humus is a brown or black colloidal substance produced by microorganisms during the humification process of decomposing biological residues. Soil humus is the main source of essential nutrient elements for plants, which can promote the physiological activities of plants and microorganisms, increase soil water storage, water retention and fertilizer retention capacity, promote the formation of good soil structure, improve soil buffering and pH, and complex soil heavy metal ions to eliminate pesticide residues in the soil. [0003] Most of the humus in the soil is an organic and inorganic complex formed by combining with the mineral part. Due to the different ways of combining and the degree of tightness, it has different effects on the soil structure and soil fertility. Humic substances are polymer mixtures with complex structu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H99/00C07G99/00
Inventor 钟成林刘晓艳张新颖刘珊珊刘发辉陈丽莎张伟杰
Owner SHANGHAI UNIV
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