分光光度法测定锂云母精矿中三氧化二铁含量的不确定度评定  

Uncertainty Evaluation of Determination of Iron Oxide Content in Lithium Mica Concentrate by Spectrophotometric Method

作　　者：彭桂香 戴泽桦 章力 PENG Guixiang;DAI Zehua;ZHANG Li(Yichun Lithium Industry Research Institute,Yichun 336000,China;Institute of Applied Chemistry,Jiangxi Academy of Sciences,Nanchang 330096,China)

机构地区：[1]宜春市锂电产业研究院,江西宜春336000 [2]江西省科学院应用化学所,江西南昌330096

出　　处：《生物化工》2024年第5期132-136,164,共6页Biological Chemical Engineering

摘　　要：本文采用邻二氮杂菲分光光度法测定锂云母精矿中三氧化二铁的含量,对结果的不确定度进行评价。采用邻二氮杂菲分光光度法,建立数学模型,分析不确定度来源。各不确定度来源主要为曲线的绘制、三氧化二铁标准溶液浓度、定容体积、移取体积、比色体积、称样试料、重复测量,其中曲线绘制和三氧化二铁标准溶液浓度对不确定度影响较大。本次测定中锂云母精矿中三氧化二铁的含量结果可表示为0.2054%±0.0119%,k=2。This paper adopts the o-phenanthroline spectrophotometric method to measure the content of iron oxide in lithium mica concentrate and evaluates the uncertainty of the results.The o-phenanthroline spectrophotometric method is used to establish a mathematical model and analyze the sources of uncertainty.The main sources of uncertainty are the plotting of the curve,the concentration of the iron oxide standard solution,the volume of the solution,the volume of pipette,the volume of the colorimeter,the weight of the sample,and the repeated measurement.Among these,the plotting of the curve and the concentration the iron oxide standard solution have a greater impact on the uncertainty.The content of iron oxide in lithium mica concentrate in this measurement can be expressed as 0.2054%±0.0119%,k=2.

关 键 词：邻二氮杂菲分光光度法 锂云母精矿 三氧化二铁 不确定度 

分 类 号：R155.5[医药卫生—营养与食品卫生学]