Method for detecting ammonium polyphosphate polymerization degree of fertilizer

A detection method and technology of ammonium polyphosphate, which are applied in the direction of chemical analysis by titration method, can solve the problems of inappropriate polymerization degree of ammonium polyphosphate-containing fertilizers and large error in detection results, and achieve small errors, high accuracy, and avoidance of The effect of experimental influence

Inactive Publication Date: 2015-07-22
SHENZHEN BATIAN ECOTYPIC ENG
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Problems solved by technology

[0008] In order to solve the technical problem that the existing detection method is not suitable for the degree of polymerization of fertilizers containing ammonium polyphosphate or the error of the detection result is large, the present invention proposes a method for accurately detecting the degree of polymerization of fertilizers containing ammonium polyphosphate

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  • Method for detecting ammonium polyphosphate polymerization degree of fertilizer

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Embodiment 1

[0035] Embodiment 1: a kind of method for detecting the polymerization degree of fertilizer containing ammonium polyphosphate, the steps are as follows:

[0036] (1) Weigh 3g of sample, add deionized water to dissolve, adjust the pH value of the solution to alkaline (specifically pH=8) with NaOH solution, filter out the insoluble matter in the solution with filter paper, and set the filtrate to a 100ml volumetric flask , use a pipette to remove 50ml of the solution for ion exchange, and dissolve it in a 250ml volumetric flask. After measuring the pH value, aliquots are to be tested;

[0037] (2) add enough HCl solution to the solution to be tested to adjust the pH to 3, replace the titrant with NaOH standard solution, titrate the sample solution to near the end point pH=9.5, record the volume of alkali consumed by the titration from 4.5 to 9.5 for the pH value, Mark A, which is equivalent to the content of phosphorus at the end of the sample;

[0038] (3) Select the above ali...

Embodiment 2

[0045] Embodiment 2: a kind of method for detecting the polymerization degree of ammonium polyphosphate-containing fertilizer, the steps are as follows:

[0046] (1) Weigh 5g sample, add deionized water to dissolve, adjust the pH value of the solution to alkaline (specifically pH=8) with NaOH solution, filter out the insoluble matter in the solution with filter paper, and set the filtrate to a 100ml volumetric flask , use a pipette to remove 50ml of the solution for ion exchange, and dissolve it in a 250ml volumetric flask. After measuring the pH value, aliquots are to be tested;

[0047] (2) add enough HCl solution to the solution to be tested to adjust the pH to 3, replace the titrant with NaOH standard solution, titrate the sample solution to near the end point pH=9.5, record the volume of alkali consumed by the titration from 4.5 to 9.5 for the pH value, Mark A, which is equivalent to the content of phosphorus at the end of the sample;

[0048] (3) Select the above aliquo...

Embodiment 3

[0055] Embodiment 3: a kind of method for detecting the polymerization degree of fertilizer containing ammonium polyphosphate, the steps are as follows:

[0056](1) Weigh 4g sample, add deionized water to dissolve, adjust the pH value of the solution to alkaline (specifically pH=8) with NaOH solution, filter out the insoluble matter in the solution with filter paper, and dilute the filtrate to a 100ml volumetric flask , use a pipette to remove 50ml of the solution for ion exchange, and dissolve it in a 250ml volumetric flask. After measuring the pH value, aliquots are to be tested;

[0057] (2) add enough HCl solution to the solution to be tested to adjust the pH to 3, replace the titrant with NaOH standard solution, titrate the sample solution to near the end point pH=9.5, record the volume of alkali consumed by the titration from 4.5 to 9.5 for the pH value, Mark A, which is equivalent to the content of phosphorus at the end of the sample;

[0058] (3) Select the above aliq...

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Abstract

The invention discloses a method for detecting the ammonium polyphosphate polymerization degree of a fertilizer. The method comprises the following steps: (1) dissolving fertilizer samples, adjusting the pH value to be alkaline, defining the volume of a solution subjected to ion exchange, and uniformly dividing the solution into two liquids to be detected; (2) adding acid in one liquid to be detected to adjust the pH value to 2-4, titrating with alkali, recording the volume of alkali consumed in the process of titrating when the pH value ranges from 4.5 to 9.5, and marking A; (3) adding acid in the other liquid to be detected for digestion, adding acid to adjust the pH value to 2-4, titrating with alkali, recording the volume of alkali consumed in the process of titrating when the pH value ranges from 4.5 to 9.5, and marking Ah; calculating the polymerization degree of the fertilizer containing ammonium polyphosphate according to the content of end group weak acid and the total phosphorus content in the solution. The method has the advantages of being small in error, and high in precision.

Description

technical field [0001] The invention relates to a detection method of the polymerization degree, in particular to a detection method of the polymerization degree of ammonium polyphosphate of fertilizer. Background technique [0002] Ammonium polyphosphate is an inorganic polymer containing phosphorus and nitrogen. Due to its high nutrient content and good solubility, it is not easy to react with calcium, magnesium, iron, aluminum and other ions in the soil solution to make the phosphate root invalid. Therefore, it is widely used in In fertilizers, the production process is very mature. According to its degree of polymerization, it can be divided into three types: oligomer, medium polymer and high polymer. The higher the degree of polymerization, the smaller the water solubility, and vice versa, the greater the water solubility. For example, when the degree of polymerization n<20, ammonium polyphosphate It is water-soluble; when n>20, ammonium polyphosphate is insolubl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16
Inventor 刘毅
Owner SHENZHEN BATIAN ECOTYPIC ENG
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