硝酸脲中酰胺态氮及总氮含量测定的研究  

STUDY ON THE DETERMINATION OF AMIDE NITROGEN AND TOTAL NITROGEN IN UREA NITRATE

作　　者：吴珧萍[1] 陈天朗[1] 陈慧[1] 范红松[1] 林庆培[1] 肖慎修[1] 

机构地区：[1]四川大学化学学院,成都610064

出　　处：《理化检验（化学分册）》2002年第3期111-113,共3页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

基　　金：国家"八五"重点科技攻关项目 (85 80 1 2 0 0 1)

摘　　要：对硝酸脲中酰胺态氮及总氮含量进行测定。以甲醛 硫酸法分析硝酸脲中酰胺态氮时 ,发现酰胺态氮的含量总是与理论值相差将近 1倍。文中解释了造成这一结果的原因 ,并找到了导致这种结果的定量关系。从反应温度、时间等方面进行多次试验 。The determination of amide nitrogen and total nitrogen by the formol H 2SO 4 titrimetric method was studied. It was found that the results of amide nitrogen obtained were only equal to half of the theoratical values. It was deduced that the cause of this error is due to a side reaction happened among urea, nitrate ion and sulfuric acid, leading to a quantitative loss of urea. The mechanism of the deduced side reaction was verified experimentally by gasometry of the nitrogen liberated in the reaction. Based on the experimental facts, a modification for the calculation of results of the conventional titrimetric method was proposed, which was proved to be more reasonable. The effects of analytical conditions, i.e. the temperature in the decomposition by H 2SO 4 and the time for decomposition were also studied, and optimum conditions of analytical procedure were thus presented.

关 键 词：硝酸脲 酰胺态氮 总氮 甲醛法 测定 分析 氮磷复合肥料 

分 类 号：TQ444.2[化学工程—化学肥料工业]