A kind of assay method of ammonium nitrogen content in urea ammonium nitrate solution

Abstract

The invention relates to a method for determining the ammonium nitrogen content in a urea ammonium nitrate solution with the nitrogen content being 27.0-33.0%. A neutral formaldehyde solution is added into a urea ammonium nitrate solution, hexamethylenetetramine and acid equivalent to the ammonium salt content are generated, on the existence of an indicator, sodium hydroxide is used for titration to reach the pH value of 8.4-8.5 as an end point, and the content of ammonium nitrogen is worked out. By controlling the pH value and the titration speed, the reaction between CO(NH2)2 and HCHO can be effectively avoided, and therefore the result accuracy is ensured. Compared with an existing method, the steps are simplified, the method is easier and rapider, the analysis process is greatly shortened, the concomitant complex base body component, manual operation and other factor influences are avoided within the controllable range, the anti-interference capability of the method is enhanced, the accuracy and precision of the analysis result are high, and the analysis testing cost is quite low.

Description

technical field [0001] The invention relates to a method for determining the content of ammonium nitrogen in urea ammonium nitrate solution with a nitrogen content of 27% to 33%. Background technique [0002] Urea Ammonium Nitrate solution (Urea Ammonium Nitrate solution), referred to as UAN solution, also known as nitrogen solution (N solution) abroad, is prepared from urea, ammonium nitrate and water. The nitrogen contents are ammonium nitrogen, nitrate nitrogen and amide nitrogen respectively. [0003] Urea ammonium nitrate solution is a new liquid nitrogen fertilizer. It is a mixed solution of urea and ammonium nitrate. The content of urea and ammonium nitrate directly affects the content and ratio of ammonium nitrogen, nitrate nitrogen and amide nitrogen, and also directly affects To the effect of using liquid fertilizer. Because the liquid fertilizer contains both inorganic nitrogen and organic nitrogen, the results of accurate and rapid analysis of ammonium nitrogen...

AI Technical Summary

Problems solved by technology

This method has the characteristics of long time and high requirements on air tightness, and the result is poor temperature resistance.

[0005] The above method has defects such as many steps, long analysis process, weak anti-interference ability, and long analysis time (requiring 1.5 hours).

Images