摘要
研究了硝酸磷肥中总氮量的测定,在测定过程中,在浓硫酸的存在下,硝酸根与过量尿素发生反应,过量尿素水解成铵根离子,加入一定量的中性甲醛,生成定量的酸,用碱标准溶液滴定,所得结果和国标法(真值)比较,相对误差在0.4%以内,具有较高的准确度和精密度。文章还对测定条件做了正交实验,选择了最佳实验条件,通过试验,说明了这种方法的可行性。
A sensitive method for the determination of the total content in nitrophosphate. The method was based on a seriers of reaction and quantitative relationship between nitrate and urea . A definite amount of urea was added in the sample to take part in the reaction . Conditions of reaction were experimentally optimized. Nitrogen was finally detennined by titration with standardized NaOH solution and calculated from the losses of amide nitrogen. The method is proved that it is feasible by experiments.
出处
《中国土壤与肥料》
CAS
CSCD
北大核心
2007年第6期85-87,共3页
Soil and Fertilizer Sciences in China
关键词
尿素
甲醛
硝酸磷肥
硝态氮
铵态氮
urea
formaldehyde
niteophosphate
nitrate
ammonium
