高频燃烧红外吸收法测量红土镍矿中碳、硫含量的不确定度评定  

Evaluation on Uncertainty of Carbon and Sulfur Content in Laterite Nickel Ore Determined by High Frequency Combustion Infrared Absorption Spectrometry

作　　者：李菲 马李 刘书慧 丁仕兵 管嵩 宋飞 LI Fei;MA Li;LIU Shuhui;DING Shibing;GUAN Song;SONG Fei(Qingdao Customs Technology Center,Shandong Qingdao 266500,China)

机构地区：[1]青岛海关技术中心,山东青岛266500

出　　处：《广州化工》2024年第19期93-96,共4页GuangZhou Chemical Industry

基　　金：海关总署科研计划项目(2020HK250)。

摘　　要：按照高频燃烧红外吸收法测定红土镍矿中的碳、硫含量并进行不确定度评定。对样品均匀性、吸湿性、熔融完全性、高频感应电流和氧气等仪器波动、操作熟练性等A类不确定度的评定采用预评估标准差法,对一试样重复测定10次,通过格拉布斯法(Grubbs)检验可疑值后,运用贝塞尔公式进行不确定度计算。对仪器的曲线拟合、称量偏差等B类不确定度逐一进行了量化并通过数学模型进行合成。最终合并A类、B类不确定度得出其合成标准不确定度和扩展不确定度。测得红土镍矿试样A中碳含量0.080%、硫含量0.019%,在95%的置信概率下,取包含因子k=2,碳含量扩展不确定度U=0.011%,硫含量扩展不确定度U=0.004%。According to the high-frequency combustion infrared absorption method,the carbon and sulfur content in laterite nickel ore were determined and the uncertainty was evaluated.The pre-evaluation standard deviation method was used for the evaluation of type A uncertainties such as sample uniformity,hygroscopicity,melting completeness,high-frequency induced current and oxygen fluctuations,and operational proficiency.One sample was repeatedly measured 10 times,and the uncertainty calculation was carried out after testing the suspicious values by the Grubbs method.The type B uncertainties such as curve fitting and weighing deviation of the instrument were quantified respectively and synthesized using a mathematical model.Finally,the uncertainty of type A and type B was combined to obtain the uncertainty of the synthetic standard and the uncertainty of extension.The carbon content and sulfur content in laterite nickel ore sample A were measured to be 0.080%and 0.019%,under the confidence probability of 95%and the inclusion factor k=2,the carbon content expansion uncertainty U=0.011%,and the sulfur content expansion uncertainty U=0.004%.

关 键 词：高频燃烧红外吸收法 红土镍矿 碳、硫含量 不确定度 

分 类 号：O657.3[理学—分析化学]