摘要
对原子荧光光度法测定食品用洗涤剂中砷含量的不确定度进行评定。通过分析实验过程中的不确定度来源,评定各不确定度分量,最后计算合成不确定度和扩展不确定度。结果表明,当样品中砷的含量为0.039 ng/ml时,扩展不确定度U=0.051 ng/ml(k=2)。原子荧光光度法测定洗涤剂样品中砷的含量时,对不确定度影响较大的是标准曲线拟合,测量重复性次之。因此实验中要选择合适的标准曲线浓度范围,尽量降低曲线拟合引入的不确定度,提高检测结果的准确性。
The uncertainty of determination of arsenic in food detergent by atomic fluorophotometry was evaluated.By analyzing the source of uncertainty in the experimental process,and evaluating each uncertainty component,finally the synthetic uncertainty and extended uncertainty were calculated.The results showed that when the content of arsenic in the sample was 0.039 ng/ml,expanded uncertainty was 0.051 ng/ml(k=2).In the determination of arsenic in detergent samples by atomic fluorophotometry,the standard curve fitting has a great influence on the uncertainty,followed by the repeatability of measurement.Therefore,in the experiment,the appropriate concentration range of standard curve should be selected to reduce the uncertainty introduced by curve fitting and improve the accuracy of test results.
作者
段平梅
刘睿
郑养珍
孟丽君
姚晨之
DUAN Pingmei;LIU Rui;ZHENG Yangzhen;MENG Lijun;YAO Chenzhi(Sinolight Daily Chemical Inspection&Certification Co.,Ltd.,Taiyuan,Shanxi 030001,China;National Cleaning Products Quality Supervision and Inspection Center,Taiyuan,Shanxi 030001,China;China Research Institute of Daily Chemistry Co.,Ltd,Taiyuan,Shanxi 030001,China)
出处
《中国洗涤用品工业》
CAS
2022年第8期46-51,共6页
China Cleaning Industry
