摘要
本文建立了温度滴定法测定大量元素水溶肥料中钾含量的不确定度数学模型,并对整个实验过程进行了评定。评定过程中的不确定度主要来源有测量的重复性、四苯硼酸钠标准溶液浓度标定、试样溶液准备、样品测定过程以及加标回收率。通过对各相对标准不确定度的计算,求出合成标准不确定度和扩展不确定度。
A mathematical model for the uncertainty evaluation of potassium oxide content determination in macroelement water-soluble fertilizer by thermometric titration was established in the whole experimental process.The main sources of uncertainty in evaluation process were measurement repeatability,calibration of sulphuric acid standard solution,the sample preparation,determination and the recovery ratio.By calculating the uncertainty of the relative standard,the uncertainty of synthesis and extension was found.
作者
李铭
陶小娟
葛静微
Li Ming;Tao Xiaojuan;Ge Jingwei(Gansu Province Product Quality Supervision and Inspection Research Institute,Lanzhou 730050,China)
出处
《广东化工》
CAS
2021年第1期176-179,166,共5页
Guangdong Chemical Industry
关键词
温度滴定法
不确定度评定
大量元素水溶肥料
钾含量
thermometric titration method
evaluation of uncertainty
macroelement water-soluble fertilizer
potassium content
