尿素硝铵溶液中硝态氮和铵态氮不同测定方法的研究

杨一，段路路(上海化工研究院　上海　200062)



尿素硝铵溶液中硝态氮和铵态氮不同测定方法的研究

杨一，段路路
(上海化工研究院上海200062)

摘要尿素硝铵溶液是我国农业水肥一体化重点推广的新型肥料，其中硝态氮和铵态氮的含量是检测产品质量的重要指标。采用高效液相色谱法和紫外分光光度法测定尿素硝铵溶液中的硝态氮含量，采用蒸馏后滴定法和甲醛法测定铵态氮含量，探讨了尿素硝铵溶液中硝态氮和铵态氮不同测定方法的差异。试验结果表明:采用高效液相色谱法和紫外分光光度法测定硝态氮含量均可获得较好的精密度，2种测定方法除对UAN-Ⅲ样品的检测结果有显著性差异外，其余无显著性差异;采用蒸馏后滴定法测定铵态氮含量比理论值平均偏高0.45％，采用甲醛法测定铵态氮含量的准确度更高。

关键词尿素硝铵溶液硝态氮铵态氮测定方法

Study of Different Methods for Determination of Nitrate Nitrogen and Ammonium Nitrogen in Urea Ammonium Nitrate Solution

Yang Yi，Duan Lulu
(Shanghai Research Institute of Chemical Industry Shanghai 200062)

Abstract Urea ammonium nitrate solution is a new kind of fertilizer，which is focused on promotion in agricultural integral control of water and fertilization in China，its content of nitrate nitrogen and ammonium nitrogen is an important index of product quality inspection.The nitrate nitrogen content of urea ammonium nitrate solution is determined by high performance liquid chromatography method and ultraviolet spectrophotometry method，and the ammonium nitrogen content of urea ammonium nitrate solution is determined by titrimetric method after distillation and formaldehyde method，and the differences between different methods for determination of nitrate nitrogen and ammonium nitrogen of urea ammonium nitrate solution are discussed.Experimental results show that better precision can be obtained in determination of the nitrate nitrogen content by both high performance liquid chromatography method and ultraviolet spectrophotometry method，except for UAN-III sample，there are not significant differences between test results by 2 determination methods; by titrimetric method after distillation to determine ammonium nitrogen content，the determined value is higher than the theoretical value，on average，by 0.45％，but more accurate results can be obtained to determine the content of ammonium nitrogen by formaldehyde method.

Keywords urea ammonium nitrate solution nitrate nitrogen ammonium nitrogen determination method

氮是组成植物体内蛋白质、核酸、叶绿素、酶、维生素、生物碱和一些激素的重要组成部分，作物缺氮不仅影响产量，而且使产品品质也明显下降［1］。植物吸收利用的氮素主要是铵态氮和硝态氮，也可以吸收有机氮，如尿素、氨基酸、酰胺酸等。不同作物对氮的吸收形态不同，如水稻、甘薯、小麦、玉米等作物是典型的喜铵态氮作物，而烟草施用硝态氮肥可增强燃烧性和增加烟草的香味［2］。研究证明，不同形态氮的配合施用，对作物有较好的增产效果，如果肥料中氮素形态及配比不合理，会影响作物的产量和品质。……