关键词: ICP-MS, GF-AAS, 乳粉, 铬, Minitab, 测量系统

Abstract: GB 5009.123-2023 "National Food Safety Standard Determination of Chromium in Foods" was implemented on 2024-03-06. The standard stipulates two commonly used testing methods for chromium in Purpose: GB 5009.123-2023 will be implemented on March 6, 2024. This standard specifies two commonly used testing methods for chromium in food: graphite furnace atomic absorption spectrometry (GF-AAS) and inductively coupled plasma mass spectrometry (ICP- MS).GB 2762-2022 stipulates the limit of chromium (calculated as Cr) in liquid milk such as sterilized milk, milk powder and prepared milk powder. As a key monitoring item for food quality and safety, chromium is very important to improve the accuracy and repeatability of chromium detection data in dairy products, ensure the reliability of detection data, and reduce the risk of misjudgment and missed determination caused by the inspection process necessary. Methods: This study applied Minitab statistical analysis tools and research methods such as control chart method, independent sample method, t test method, and variance analysis method to measure the stability, bias, linearity, and repeatability of the system using these two commonly used test methods. Conduct research and analysis on reproducibility. Results: There were no abnormal points in the range and mean charts of the measurement systems of the two detection methods. The errors within the group were under statistical control and the stability was good. There was no significant bias or significant difference in the results of the measuring instrument linear table and bias analysis table. linear error; the gage (R&R) report analysis results show that repeatability and reproducibility are good; the two-factor variance analysis table shows that the sample is the only factor that significantly affects the measurement error; the research variation analysis table shows that the measurement system error is acceptable. Conclusions: The ICP-MS method and GF-AAS method can not only effectively ensure the reliability and repeatability of chromium content detection data in milk powder, but also provide scientific basis for laboratory error analysis and control of measurement systems. It also provides a reference for the evaluation of measurement systems for the detection of other heavy metals in dairy products and the detection of heavy metals in other foods.

Key words: ICP-MS, GF-AAS, milk powder, chromium , Minitab, measurement system