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Measuring method for encapsulating agent in porous granular ammonium nitrate

A technology of granular ammonium nitrate and a determination method is applied in the field of determining the content of encapsulant in porous granular ammonium nitrate by gravimetric method after liquid separation, and can solve the problems of long reflux time, complicated operation and the like

Active Publication Date: 2012-10-31
TIANJI COAL CHEM IND GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method must purchase a special Soxhlet extraction device, the joints of each part are strictly sealed, there is no air leakage, the reflux time is long, the measurement time of each sample is as long as 60 minutes, and only one sample can be analyzed at a time, the operation is cumbersome

Method used

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  • Measuring method for encapsulating agent in porous granular ammonium nitrate
  • Measuring method for encapsulating agent in porous granular ammonium nitrate
  • Measuring method for encapsulating agent in porous granular ammonium nitrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Accurately weigh 100g of the sample, place it in a 100mL beaker, add 60°C desalted water, place it on an electric heating plate with a preset temperature of 60°C, stir while heating until it is completely dissolved, then pour the solution into a 250mL conical in a separatory funnel. Rinse the beaker with 60°C water for 2-3 times, and pour the rinse solution into the separatory funnel. Place the separatory funnel on the iron ring of the iron stand and let it stand for 10 minutes to separate the aqueous solution and oil. Slowly drain the aqueous solution in the lower layer of the separatory funnel, and the insoluble part adheres to the inner wall of the separatory funnel. Rinse the funnel with 60°C water and repeat the operation 2 times. Place the previously constant weight weighing bottle under the end of the separatory funnel, add acetone with a dropper to clean the inner wall of the separatory funnel until it is clean.

[0015] Heat the weighing bottle in a water ba...

Embodiment 2

[0017] Get 3 samples, parallel test 10 times respectively, the precision test result of the present invention is shown in Table 1.

[0018]

[0019] Relevant data show that when the coating agent content in the sample is 0.06%-0.13%, the relative standard deviation measured by the prior art method is 5.63%-11%. As can be seen from Table 1, the relative standard deviation of the test of the present invention is obviously better than the prior art method.

Embodiment 3

[0021] The sample was measured according to the test method of Example 1, and a certain standard amount of coating agent was added at the same time, and the measurement was performed again, and the recovery rate was shown in Table 2.

[0022]

[0023] It can be seen from Table 2 that the recoveries reached 98.45% and 99.92%, and the accuracy of the method met the requirements.

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Abstract

A measuring method for an encapsulating agent in porous granular ammonium nitrate includes the steps as follows: dissolving a sample in water; still standing the solution and forming layered oil and water; abandoning the water layer; transferring the oil layer through acetone or cyclohexane into a constant-weight weighing bottle; volatilizing almost all the acetone or cyclohexane, and drying the weighing bottle to reach a constant weight; and calculating the mass percentage content of the encapsulating agent in the porous granular ammonium nitrate. The method provided by the invention is simple to operate, has a high detection speed, and realizes the batch processing of samples.

Description

technical field [0001] The invention relates to a method for measuring the content of the coating agent in porous granular ammonium nitrate, in particular to a method for measuring the content of the coating agent in the porous granular ammonium nitrate by using a gravimetric method after liquid separation. Background technique [0002] The existing method for determining the content of porous granular ammonium nitrate coating agent is "Soxhlet extraction method". The measurement process of the method is as follows: the sample to be tested is wrapped in a degreased filter paper bag and put into an extraction tube. Add n-hexane into the extraction bottle, heat the extraction bottle, the n-hexane vaporizes, rises from the connecting pipe into the condenser, condenses into liquid and drips into the extraction pipe to extract the coating agent in the sample. When the n-hexane liquid level in the extraction tube reaches a certain height, the n-hexane dissolved in the coating age...

Claims

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Application Information

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IPC IPC(8): G01N5/04
Inventor 马爱枝王百文郭联红常青李永平
Owner TIANJI COAL CHEM IND GROUP
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