石墨炉原子吸收分光光度法测定水中铟不确定度分析  

Uncertainty Analysis for Determination of Indium in Water Through Graphite Furnace Atomic Absorption Spectrometry

作　　者：巩琪 李霈 毛倩 王斌 GONG Qi;LI Pei;MAO Qian;WANG Bin(No.203 Research Institute of Nuclear Industry,Xi'an 710086,China)

机构地区：[1]核工业二0三研究所,西安710086

出　　处：《四川环境》2024年第3期145-148,共4页Sichuan Environment

摘　　要：铟作为一种环境污染物,其化合物具有致癌作用和生物毒性,是水质监测的一项重要的指标。为了确定检测过程中不确定度的主要来源,如实反映测量数据的置信度和准确度,提高检测质量,对石墨炉原子吸收分光光度法测定水中铟不确定度进行分析和评估。参照不确定度的评定规范和石墨炉原子吸收分光光度法对水中铟的测定原理建立数学模型,分析了包括重复性、标准储备液、标准曲线配制、标准曲线拟合、测量仪器以及样品前处理等不确定度来源,分别计算了各不确定度分量、合成标准不确定度和扩展不确定度。结果表明水中铟的平均值为19μg/L,扩展不确定度为5.6%,水中铟含量结果表示为19±2μg/L,k=2。经过评估分析,测定水中铟的不确定度的主要影响因素为样品的重复性处理和标准溶液的配制。Indium is an environmental pollutant.Its compounds have carcinogenic effects and biological toxicity,making it an important indicator for water quality monitoring.In order to determine the main sources of uncertainty in the detection process,truthfully reflect the confidence and accuracy of measurement data,and improve the quality of detection,the uncertainty in the determination of indium in water through the graphite furnace atomic absorption spectrophotometry was analyzed and evaluated.A mathematical model was established based on the evaluation criteria for uncertainty and the principle of graphite furnace atomic absorption spectrophotometry for the determination of indium in water.The sources of uncertainty,including repeatability,standard stock solution,standard curve preparation,standard curve fitting,measurement instruments,and sample pretreatment were analyzed,and components of uncertainty,synthetic standard uncertainty,and expanded uncertainty were calculated.The results indicated that the average value of indium in water is 19μg/L,the extended uncertainty was 5.6%,and the result of indium content in water was 19±2μg/L,k=2.After evaluation and analysis,the factors affecting indium uncertainty in water were the repetitive processing of samples and the preparation of standard solution.

关 键 词：铟 石墨炉原子吸收分光光度法 不确定度 

分 类 号：O657.31[理学—分析化学] X327[理学—化学]