复混肥料中有效P_2O_5测定的不确定度评定  

Uncertainty evaluation of determination of available P_2O_5 in compound fertilizer

作　　者：周媛 

机构地区：[1]山西省应用化学研究所,山西太原030027 [2]山西省化肥农药产品监督检验站,山西太原030027

出　　处：《磷肥与复肥》2016年第10期32-33,共2页Phosphate & Compound Fertilizer

摘　　要：用磷钼酸喹啉重量法测定复混肥料中有效P_2O_5含量。为了合理表征测量值的分散性,确定测试结果的有效性,对测定过程进行不确定度评定。测定结果的不确定度来源主要有天平称量、样品分取、重复性实验等。得到复混肥料样品中有效P_2O_5测定结果的合成标准不确定度u_c(w)=0.021%,扩展不确定u_c=0.042%(包含因子k=2)。The content of available phosphorus in compound fertilizer is determined by phosphomolybdic acid quinoline gravimetric method. In order to characterice the dispersibility of measurement value reasunablely, determine the validity of the test results, the uncertainty evaluation of the measurement process is carried out. The uncertainty sources of the determination results indude balance weighting, sample splitting, repeatability test etc. The standard uncertainty of the determination results of available P2O5 in sample compound fertilizer is 0.021%, the expanded uncertainty is 0.042% in coverage factor-k of 2.

关 键 词：复混肥料:不确定度 有效P2O5含量 

分 类 号：TQ444[化学工程—化学肥料工业]