CAJ | 학술논문

通过建立数学模型,分析了原子荧光法测定金矿中砷和铋的测量不确定度的影响因素,计算各影响因素的不确定度分量,并计算金矿中砷和铋的合成标准不确定度和扩展不确定度.结果表明：测量不确定度主要由样品制备过程和标准曲线拟合构成.金矿中砷的含量为18.398μg/g,其扩展不确定度为0.5553μg/g (k=2),结果符合测试规范要求.铋的含量为0.3593μg/g,扩展不确定度为0.4411μg/g (k=2),铋的不确定度偏大,不符合测试规范要求,应通过降低铋标准溶液的浓度和减少待测液的稀释倍数来降低标准曲线拟合产生的不确定度.
통과건립수학모형,분석료원자형광법측정금광중신화필적측량불학정도적영향인소,계산각영향인소적불학정도분량,병계산금광중신화필적합성표준불학정도화확전불학정도.결과표명：측량불학정도주요유양품제비과정화표준곡선의합구성.금광중신적함량위18.398μg/g,기확전불학정도위0.5553μg/g (k=2),결과부합측시규범요구.필적함량위0.3593μg/g,확전불학정도위0.4411μg/g (k=2),필적불학정도편대,불부합측시규범요구,응통과강저필표준용액적농도화감소대측액적희석배수래강저표준곡선의합산생적불학정도.
Through establishing an mathematical model, the evaluation of the measurement uncertainty of arsenic and bismuth in gold ore by atomic fluorescence spectrometry ( AFS) was investigated. Each partial uncertainty of measurement was analyzed and calculated. The combined standard uncertainty and the expanded uncertainty of arsenic and bismuth were calculated respectively. The uncertainty of As and Bi was mainly composed of the uncertainty of the preparation of samples and uncertainty of the fitting of the standard curve. When the concentration of As in gold ore is 18. 398 μg/g, the expanded uncertainty is 0. 5553 μg/g (k=2). When the concentration of Bi is 0. 3593μg/g, the expanded uncertainty is 0. 4411 μg/g (k=2). The expanded uncertainty of Bi is too great to satisfy the requirement of measurement standard. In order to reduce the uncertainty produced by the standard curve fitting, it is necessary to prepare a low concentration of standard solution and increase the mount of samples and reduce the dilution ratio of samples.