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
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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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