摘要
为保证检测质量,科学地确定原子荧光法测定总砷含量检测结果的量值范围,笔者以圆白菜标准物质为材料,分析、评估了总砷检测过程中存在的各种不确定度分量,并计算出其扩展不确定度。根据不确定度分量大小可以得出,砷测定值的不确定度主要来源于测定过程中校准曲线的不确定度。该方法测定总砷含量的扩展不确定度为0.0098mg/kg,检测结果为(0.066±0.010)mg/kg,在标准物质含量(0.062±0.014)mg/kg的范围内,表明方法的分析过程处于质控状态,结果可靠。
To ensure the inspecting quality, and scientifically determine the reasonable value range of arsenic content detected, the total arsenic content of cabbage as a certified reference material （CRM） was analyzed in order to evaluate the measurement uncertainty of Atomic Fluorescence Spectrometer （AFS） method. The result showed that the uncertainty in measurement was contributed to that of the standard curve. The expanded uncertainty of AFS measurement was 0.0098 mg/kg. The detected total As content in the cabbage sample was （0.066±0.010） mg/kg, which was consistent with CRM value （0.062±0.014） mg/kg. Results suggested that analysing procedure of residual arsenic content was under control and reliable.
出处
《中国农学通报》
CSCD
北大核心
2009年第21期77-81,共5页
Chinese Agricultural Science Bulletin
基金
北京市科委项目资助"桃果铅和镉来源及残留清除方式"(Z080005032508024)
关键词
原子荧光法
总砷
不确定度
atomic fluorescence spectrometry
total arsenic
measurement uncertainty
