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| Influence of mass concentration range of standard curve on uncertainty of determination of inorganic arsenic in krill oil by HPLC-ICP-MS |
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| DOI：10.12166/j.zgyz.1003-7969/2020.04.029 |
| KeyWord:krill oil uncertainty inorganic arsenic HPLC-ICP-MS |
| FundProject:宁夏高等学校科学技术研究项目( NGY2017210）；宁夏青年教师教育教学改革项目（ NXJG2017072） |
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| Abstract: |
| The determination of inorganic arsenic in krill oil was established by high performance liquid chromatography-inductively coupled plasma mass spectrometry. The mathematical model was established to calculate and evaluate the uncertainty of the test process system. The content of inorganic arsenic in krill oil was determined according to GB 5009.11—2014 Determination of total arsenic and inorganic arsenic in food. Inorganic arsenic content of the same sample was tested in the standard series of three concentration ranges, and the effect of the mass concentration of standard curve on the uncertainty of inorganic arsenic in krill oil was evaluated.The results showed that the mass concentration and uncertainty of the same sample measured under the three standard series were (0.56±0.536) ng/mL, (0.56±0.115) ng/mL and (0.55±0.030) ng/mL respectively, and the relative expansion certainty were 191.4%, 41.1% and 10.9%, respectively. The research showed that as the mass concentration range of the standard curve increased, the uncertainty evaluation results increased, and the accuracy of the measurement results was lower. |
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