Uncertainty evaluation of total arsenic in pork by inductively coupled plasma mass spectrometry
10.19428/j.cnki.sjpm.2020.20094
- VernacularTitle:电感耦合等离子体质谱法测定猪肉中总砷的不确定度
- Author:
Si-lin WU
1
;
Xin-mei WANG
;
Jian YU
;
Chen PAN
;
Song-qing GU
;
Ming LU
Author Information
1. Shanghai Institute for Food and Drug Control, Shanghai 201203, China
- Publication Type:Research Article
- Keywords:
total arsenic;
uncertainty;
inductively coupled plasma mass spectrometry(ICP-MS);
pork
- From:
Shanghai Journal of Preventive Medicine
2020;32(5):387-
- CountryChina
- Language:Chinese
-
Abstract:
Objective To make uncertainty evaluation of total arsenic in pork by using the national food safety standard "GB 5009.11-2014 determination of total arsenic and inorganic arsenic in food", and discuss the influence of each uncertainty component on the determination results so as to improve the accuracy of the experimental results. Methods The uncertainty sources that affected the measurement results in the measurement process, including repeatability measurement, sample weighing, sample dilution, standard concentration, standard curve and so on were evaluated.The uncertainty introduced by the repeatability measurement was evaluated by class A, the uncertainty caused by other factors was evaluated by class B, and the phase was calculated according to each component.The synthetic standard uncertainty and the relative expanded uncertainty were discussed, and so were the influence of the uncertainty components on the measurement results. Results According to the contribution of uncertainty from large to small was the sample standard concentration, standard curve, repeatability determination, sample weighing and sample dilution.The calculated relative composite standard uncertainty was 0.0405, and the relative expanded uncertainty was 0.081 (k=2). Conclusion The experimental results show that the concentration of standard substance has a great influence on the measurement process, so it is necessary to standardize the dilution process and simplify the dilution procedure to improve the accuracy of measurement results.
