氢化物发生-原子荧光光谱法测定煤中砷含量测量不确定度分析与评定  

Analysis and Evaluation of Uncertainty in Measurement of Arsenic Content in Coal by Hydride Generation Atomic Fluorescence Spectromitry

作　　者：缪红兵 金艳梅 周德伟 Miao Hong-bing;Jin Yan-mei;Zhou De-wei(Guizhou Coal Product Quality Supervision&Inspection Institute,Liupanshui,Guizhou 553001,China)

机构地区：[1]贵州省煤炭产品质量监督检验院,贵州六盘水553001

出　　处：《福建分析测试》2024年第5期55-59,共5页Fujian Analysis & Testing

基　　金：六盘水市科技项目(52020-2023-0-1-21)。

摘　　要：使用氢化物发生-原子荧光光谱法检测煤中砷含量的不确定度,进一步探讨不确定度的根本原因,最终结果的精准度受到样品处理、检测试剂、检测环境等诸多因素的影响。创新设计一个数学模型,从测量重复性、试剂溶液浓度、煤样处理等多个角度入手,对不确定度的根本因素展开研究探讨,核算出煤中砷的合成标准不确定度是0.133 ug/g,样品砷含量检测数据是(1.75±0.27)μg/g,包含因子k=2。各测量不确定度的核心影响因素有三个:其一是标准工作曲线拟合,其二是测量重复性,其三是煤样处理,因此在测定时应加强样品处理、试剂溶液、测定条件等影响因素的控制。The uncertainty of detecting arsenic content in coal using hydride generation atomic fluorescence spectrometry is further explored to find the fundamental reasons for the uncertainty.The accuracy of the final result is influenced by many factors such as sample processing,detection reagents,and detection environment.A mathematical model was Innovatively designed,starting from multiple perspectives such as measurement repeatability,reagent solution concentration,and coal sample processing,to study and explore the fundamental factors of uncertainty.It was calculated that the combined standard uncertainty of arsenic in coal is 0.133 ug/g,and the sample arsenic content is(1.75±0.27)μg/g with coverage factor k=2.There are three core factors that affect uncertainty:the first,fitting the standard working curve;second,measurement repeat⁃ability;and third,coal sample processing.Therefore,during measurement,it is necessary to strengthen the control of factors such as sample processing,reagent solution,and measurement conditions.

关 键 词：煤 砷 原子荧光光谱法 测量不确定度 数学模型 测量重复性 

分 类 号：O657.31[理学—分析化学]