Detection method for phosphate ester content in powdery anti-caking agent

Abstract

The invention relates to a detection method for phosphate ester content in a powdery anti-caking agent. The method comprises the following concrete steps of: weighing m g of the powdery anti-caking agent, and placing the powdery anti-caking agent in a conical flask, adding concentrated sulfuric acid, then standing for 10 minutes, followed by heating until the powdery anti-caking agent is dissolved completely, adding concentrated nitric acid, the concentrated sulfuric acid and perchloric acid after the resulting solution is cooled, then carrying out heating until the solution presents white, followed by standing and cooling, adding a precipitation agent and standing for cooling, filtering the resulting solution through a sucking filtration apparatus, placing upper precipitation in a beaker, titrating the precipitation through a standard sodium hydroxide solution until the color of the precipitation turns from yellow to colorless, recording consumed volume of the sodium hydroxide solution, adding three drops of 10 g / L of phenolphthalein to the resulting solution, carrying out back titration through a standard hydrochloric acid solution until red color of the solution disappears, recording the consumed volume of the hydrochloric acid solution, calculating the phosphate ester content in the powdery anti-caking agent according to the consumed volume of the sodium hydroxide solution and the consumed volume of the hydrochloric acid solution. The method provided by the present invention is applicable for analysis of the phosphate ester content in various powdery anti-caking agents. In addition, the method has the following characteristics that: color error, calculating error, experiment error and the like are reduced.

Description

technical field [0001] The invention relates to a method for measuring the phosphate content of a powder anticaking agent. Background technique [0002] With the increasing demand for fertilizer anti-caking agents, the types of anti-caking agents are also gradually increasing. The currently used anti-caking agents mainly include paste, oil and powder. According to the market demand and the improvement of fertilizer production technology, the use of powder anti-caking agent is increasing, but the optimal amount of powder anti-caking agent for different fertilizers needs certain technical indicators to guide, of which phosphoric acid Ester content is an indispensable indicator. [0003] As far as the current analysis methods for paste and liquid anti-caking agents are concerned, there are large errors due to incomplete digestion of the powder, resulting in inaccurate analysis results and affecting the anti-caking effect of the anti-caking agent on fertilizers. Contents of t...

AI Technical Summary

Problems solved by technology

[0003] As far as the current analysis methods for paste and liquid anti-caking agents are concerned, there are large errors in the incomplete digestion of powders, resulting in inaccurate analysis results and affecting the anti-caking effect of the anti-caking agent on fertilizers.