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Method for detecting content of fulvic acid in ammonium phosphate fertilizer,

A detection method, the technology of fulvic acid, is applied in the direction of analyzing the material by chemical reaction and analyzing the material by observing the influence on the chemical indicator, which can solve the problems of poor effectiveness and large error of experimental data, etc., and achieve Conducive to the measurement, the effect of small error with the theoretical value

Inactive Publication Date: 2018-01-05
WENGFU DAZHOU CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Ammonium phosphate is an important phosphate fertilizer variety in my country, and is an important raw material for the production of compound fertilizer and BB fertilizer. The most prominent problem in its application in agricultural production is that the phosphorus applied to the soil will be quickly fixed by the soil. Transformed into insoluble Ca-P compounds in soil, and transformed into Fe-P compounds and Al-P compounds with poor availability in southern red soil
[0004] Therefore, people often use weathered coal, lignite, and peat as raw materials to add ammonium phosphate fertilizers to prepare ammonium phosphate fertilizers containing fulvic acid, which can effectively alleviate the process of phosphorus being fixed by the soil. There are few measurement techniques for acid content, and the error between the experimental data and the theoretical value is relatively large

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  • Method for detecting content of fulvic acid in ammonium phosphate fertilizer,

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] A detection method of fulvic acid content in ammonium phosphate fertilizer, comprising the following steps:

[0073] Add 0.8mol / L potassium dichromate to sulfuric acid, boil and cool to obtain mixed solution C, add o-phenanthroline indicator and 0.1mol / L standard ferrous salt solution to mixed solution C, the solution changes from orange to red The end point is when it turns green and then wine red. Record the volume of the consumed ferrous salt solution to calculate the content of fulvic acid in the ammonium phosphate fertilizer.

[0074] Above-mentioned test is blank control test, is intended to remove mother liquor to the impact of potassium content determination result, and the volume of the ferrous ammonium sulfate standard titration solution that test gained consumes is 12.5 μ L, is V 0 .

Embodiment 2

[0076] A detection method of fulvic acid content in ammonium phosphate fertilizer, comprising the following steps:

[0077] 1) Dissolving 5 g of ammonium phosphate fertilizer containing fulvic acid in water, and adding sulfuric acid thereto to obtain mixed solution B;

[0078] 2) Grinding the undissolved particles in the mixed solution B, filtering, and the obtained supernatant is the fulvic acid extract; wherein, the undissolved particles are ground to a size within the range of 50-60 μm.

[0079] 3) Add 0.8mol / L potassium dichromate to the fulvic acid-containing extract described in step 2), boil and cool to obtain a mixed solution C, add o-phenanthroline indicator and 0.1 mol / L standard ferrous salt solution, the solution changes from orange red to green and then to wine red as the end point, record the volume of ferrous salt solution consumed, and then calculate the content of fulvic acid in ammonium phosphate fertilizer.

[0080] Among them, the volume of the consumed fe...

Embodiment 3

[0082] A detection method of fulvic acid content in ammonium phosphate fertilizer, comprising the following steps:

[0083] 1) Mixing the ethylenediaminetetraacetic acid solution and the pyrophosphate solution, wherein the ethylenediaminetetraacetic acid solution accounts for 35% of the total volume of the mixed solution, and the obtained solution is the mixed solution A;

[0084] 2) adding sulfuric acid to the mixed solution A described in step 1) to obtain the mixed solution B;

[0085] 3) Add 0.8mol / L of potassium dichromate to the mixed solution B described in step 2), boil and cool to obtain a mixed solution C, add o-phenanthroline indicator and 0.1mol / L to the mixed solution C Standard ferrous salt solution, the solution changes from orange red to green and then to wine red is the end point, record the volume of ferrous salt solution consumed, and then calculate the content of fulvic acid in ammonium phosphate fertilizer.

[0086] Above-mentioned test is blank control t...

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Abstract

The invention discloses a method for detecting the content of fulvic acid in ammonium phosphate fertilizer. The method comprises the steps of 1, dissolving the ammonium phosphate fertilizer containingthe fulvic acid in a solution A to obtain a mixed solution containing the fulvic acid; 2, adding inorganic acid into the mixed solution containing the fulvic acid in the step 1, conducting grinding and filtration to obtain a supernatant, wherein the supernatant is an extraction solution containing the fulvic acid; 3, sequentially adding potassium dichromate, a phenanthroline indicator and a ferrous salt solution into the extraction solution containing the fulvic acid in the step 2 till the solution turns red, and calculating the content of the fulvic acid in the ammonium phosphate fertilizerby recording the volume of the addition solution. According to the method for detecting the content of the fulvic acid in the ammonium phosphate fertilizer, firstly, the interference of metal ions ina sample to a detection result is excluded, secondly, the inorganic acid is adopted to extract the fulvic acid from the ammonium phosphate fertilizer, and finally, an indicator titration method is adopted to calculate the content of the fulvic acid in the ammonium phosphate fertilizer; by means of the method, errors between experimental data and theoretical values are smaller.

Description

technical field [0001] The invention relates to a detection method of fulvic acid content, in particular to a detection method of fulvic acid content in ammonium phosphate fertilizer. Background technique [0002] Fulvic acid is a kind of humic acid, which is characterized by small molecular weight, high biological activity, many acidic genes, strong permeability, and easy absorption by plants. It can be combined with nitrogen, phosphorus and potassium inorganic fertilizers to produce fulvic acid compound fertilizer, which can fix nitrogen, release phosphorus and release potassium, or directly produce clear liquid fertilizer with fulvic acid that does not flocculate, and has the function of plant growth regulator. [0003] Humic acid refers to a type of organic mixture formed by the remains of animals and plants through complex geochemical reactions with the participation of microorganisms. Natural humic acid can be divided into three categories: soil humic acid, water humi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 赵强石家华张金菊赵磊张林波徐林林
Owner WENGFU DAZHOU CHEM CO LTD
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