蒸馏滴定法测定复混肥料中氮含量的不确定度评定研究

Study on Evaluation of the Uncertainty of Measurement for the Determation of Nireogen Content in Compound Fertilizers by Distillation Titration

依据GB/T 8572-2010方法中的蒸馏滴定法测定复混肥料中氮含量分析,建立氮含量数学模型,分析其产生的不确定主要来源,并对各分量进行分析统计,计算其合成标准不确定度和扩展不确定度,其扩展不确定为0.07%,氮含量测定结果为(10.29±0.07)%,k=2。

According to GB/T 8572-2010 method,the determination of nitrogen content in compound fertilizer was analyzed by distillation titration,the mathematical model of nitrogen content was established and the main source of uncertainty was analyzed. Through the analysis of each component, synthetic standard uncertainty and expanded uncertainty were calculated. The results showed that the expanded uncertainty was 0.07%, and the determination results of nitrogen content was （ 10.29±0.07 ） %, k value was 2.