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
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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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