Method for determining ammonium nitrogen content in urea ammonium nitrate solution
The technology of a urea ammonium nitrate and a determination method is applied in the field of determination of ammonium nitrogen content, which can solve problems such as weak anti-interference ability, poor temperature performance, and long analysis process, and achieve high accuracy and precision, enhanced anti-interference ability, Analyzing the effect of low cost testing
Active Publication Date: 2016-11-09
柳州化工股份有限公司
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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).
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Embodiment 1
[0022] Embodiment 1: a kind of assay method of ammonium nitrogen content in urea ammonium nitrate solution, add neutral formaldehyde solution in urea ammonium nitrate solution, generate hexamethylenetetramine and the acid equivalent to ammonium salt content, in indication In the presence of the agent, titrate with sodium hydroxide to a pH value of 8.4 to 8.5 as the end point, and calculate the content of ammonium nitrogen.
[0023] Calculation formula: N%=
[0024] In the formula:
[0025] V 0 ——the volume of sodium hydroxide standard titration solution consumed for blank determination, mL;
[0026] V 1 - the volume of sodium hydroxide standard titration solution consumed by the determination of the sample, mL;
[0027] C—concentration of sodium hydroxide standard titration solution, mol / L;
[0028] m - the weight of the sample, g.
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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...
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IPC IPC(8): G01N31/16
CPCG01N31/16
Inventor 马松杰杨燕黄积候
Owner 柳州化工股份有限公司