四极杆电感耦合等离子体质谱仪检出限的不确定度评定

摘要

依据JJF1159 - 2006《四极杆电感耦合等离子体质谱仪校准规范》,使用标准溶液GBW(E) 130242(Be,In,Bi混合溶液)校准了四极杆电感耦合等离子体质谱仪的检出限,并对其可能引入的不确定度分量(空白溶液测量列的标准偏差、测量重复性、标准溶液的定值以及仪器的分辨力等)进行了分析,建立了数学模型,最后以合成标准不确定度乘以95％置信概率下的扩展因子2获得检出限的扩展不确定度.%Based on JJF1159-2006 "Calibration Specification for Quadrupole Inductively Coupled Plasma Mass Spectrometers", the detection limits of quadrupole ICP-MS are calibrated using the state standard solution GBW(E) 130242(mixed solution of Be,In,Bi elements). The main uncertainty components in determination process (standard deviation of blank solution,measurement repeatability,certified value of standard solution and instrumental resolution) were reasonably evaluated. A mathematical model was thus established. The expanded uncertainty of detection limit was obtained through multiplying the combined standard uncertainty by 2(expanded factor under confidence probability of 95%).