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Method for determining humus and component contents thereof in sludge compost

A humus and composting technology, applied in the field of humus determination, can solve the problems of incomplete extraction, long extraction cycle, and lack of standard specifications for humus, and achieve the effects of overcoming incomplete extraction, improving measurement accuracy, and simple and quick determination methods

Inactive Publication Date: 2017-02-01
CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But at present, these kinds of extractants all have the disadvantages of incomplete extraction and long extraction period.
About the extraction and determination of humic substances, there is currently no standard specification at home and abroad

Method used

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  • Method for determining humus and component contents thereof in sludge compost
  • Method for determining humus and component contents thereof in sludge compost
  • Method for determining humus and component contents thereof in sludge compost

Examples

Experimental program
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Effect test

Embodiment 1

[0045] The present embodiment provides a method for measuring humus and component content thereof in sludge compost, which comprises the following steps:

[0046] S1, air-dry and pulverize the sludge compost, pass through a 100-mesh sieve to obtain a sludge compost sample, and then measure the water content ω of the sludge compost sample;

[0047] S2, take 5g of the sludge compost sample described in step S1, add 50mL extract solution therein, carry out 30min boiling water bath after mixing, add deionized water after cooling to 200mL, and then under the centrifugal speed of 4000r / min Centrifugal 10min, gained supernatant is humic substance solution, and volume is V 2 , from which the volumes V are taken, respectively 3 and V 4 The first humic substance solution and the second humic substance solution; Another equivalent amount of the leach solution is carried out in the boiling water bath, and then the volume is V 3 and V 4 The first blank sample and the second blank sampl...

Embodiment 2

[0065] This embodiment is basically the same as Embodiment 1, the difference is only in:

[0066] The time of the boiling water bath described in step S2 is 25min;

[0067] The volume of the first humic substance solution is 8mL;

[0068] In step S3, the pH value of the second humic substance solution is adjusted to 2.

Embodiment 3

[0070] This embodiment is basically the same as Embodiment 1, the difference is only in:

[0071] The time of the boiling water bath described in step S2 is 20min;

[0072] The volume of the first humic substance solution is 8mL;

[0073] The volume of the first humic acid solution is 15mL.

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Abstract

The invention relates to a method for determining humus and component contents thereof in sludge compost. The method comprises the following steps: determining the water content of a sludge compost sample, adding a leaching solution, treating in a water bath, centrifugating to obtain a clear solution, and taking out a first humus solution and a second humus solution from the clear solution; regulating the pH value of the second humus solution to 1-2, centrifugating to separate the precipitate out, washing with water, adding sodium hydroxide, completely dissolving the sodium hydroxide to obtain a humic acid solution, taking out a first humic acid solution from the humic acid solution, respectively adding a potassium dichromate solution and concentrated sulfuric acid into the first humus solution and first humic acid solution to respectively obtain a first sample and a second sample, respectively adding an isometric indicator to respectively obtain a first titrating sample and a second titrating sample, sequentially titrating to the preset color by using a ferrous sulfate standard solution, and calculating the component contents according to the preset formula. The method overcomes the effects of incomplete extraction and long extraction period in the traditional process, and has high accuracy of determination results.

Description

technical field [0001] The invention relates to the technical field of humus determination, in particular to a method for determining the content of humus and its components in sludge compost. Background technique [0002] High-temperature aerobic composting is an effective way to treat solid waste such as sludge and livestock manure to make it harmless and resourceful. The unstable organic substances in solid waste are gradually degraded through composting, and at the same time, stable humus is generated. substance. Compost humus is an important index to evaluate the maturity of compost. Humus fertilizers can improve soil structure, increase fertilizer utilization, reduce environmental pollution, and at the same time regulate crop physiological functions and affect enzyme activity and microbial activity. [0003] According to their different solubility in acid and alkali, humic substances can be divided into humic acid, fulvic acid and humin. Humic acid and fulvic acid h...

Claims

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Application Information

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IPC IPC(8): G01N31/16G01N31/22G01N1/34
CPCG01N31/16G01N1/34G01N31/22
Inventor 李国学李恕艳李丹阳
Owner CHINA AGRI UNIV
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