湿法磷酸合成磷酸脲中总氮含量的测定

Determination of Total Nitrogen in Urea Phosphate

叙述了磷酸脲样品中总氮含量的测定。用浓硫酸加热使磷酸脲中酰胺态氮转化为氨态氮,蒸馏并吸收在过量的硫酸标准溶液中。在指示液存在下,用氢氧化钠标准溶液返滴定。该方法操作简便,结果准确。加标回收率为99.2%～101.6%。

In this paper we discusses total nitrogen determination of urea phosphate. CON-N was changed Ammonium nitrogen with concentrated sulfuric acid. Nitrogen was distilled and absorbed with superfluous sulfuricacidstandard solution. Using NaOH standard solution as titration and under existing indicator. The method has simple operation and high accuracy,the marked recovery rate 99.2%-101.6%.