摘要
分析了能量色散X荧光光谱法测定大米中镉含量不确定度的各分量,分析了测量不确定度的来源。测量不确定度主要来源于标准物质和工作曲线拟合。对不确定度分量进行评定,经计算得出合成标准不确定度和扩展不确定度。当大米中镉元素的含量为0.268 mg/kg时,扩展不确定度为0.029 mg/kg(k=2)。
The sources affecting uncertainty in determination of cadmium in rice by energy dispersive X-ray fluorescence spectrometry were analyzed and evaluated. The measurement uncertainty is mainly derived from the standard material and the work curve regression. The uncertainty components were evaluated and the combined standard uncertainty and expanded uncertainty were calculated. The expanded uncertainty was 0.029 mg/kg（k=2） when the cadmium content in rice sample was 0.268 mg/kg.
作者
李强
欧飞
吴敏
黄万燕
LI Qiang, OU Fei, WU Min, HUANG Wanyan(Jiangsu Skyray Instrument Co., Ltd., Kunshan, Jiangsu 215300, China; 1st author： lq81749@126.co)
出处
《中国稻米》
2018年第2期64-66,69,共4页
China Rice
关键词
能量色散X荧光光谱法
大米
镉
不确定度
energy dispersive X-ray fluorescence spectrometry
rice
cadmium
uncertainty of measurement
