Abstract
[Objective] To evaluate the uncertainty in the determination of lead in tea by inductively coupled plasma–mass spectrometry (ICP-MS) and to improve the method so as to enhance the quality of the analytical results. [Methods] Based on the mathematical model and the experimental procedure, the sources of uncertainty components were analyzed and combined. [Results] When the lead content in tea was 0.346 mg/kg, the expanded uncertainty was 0.026 mg/kg at a 95% confidence level (k = 2). After method improvement, the combined relative standard uncertainty decreased from 0.038 to 0.019, and the expanded uncertainty decreased from 0.026 mg/kg to 0.013 mg/kg. The measurement result was (0.341 ± 0.013) mg/kg (k = 2), indicating a significant reduction in uncertainty. [Conclusion] Calibration curve fitting and sample weighing are the main sources of uncertainty in this experiment.
Publication Date
7-13-2026
First Page
53
Last Page
59
DOI
10.13652/j.spjx.1003.5788.2025.80499
Recommended Citation
Yingze, SUN
(2026)
"Evaluation and improvement of method for uncertainty in the determination of lead in tea by ICP-MS,"
Food and Machinery: Vol. 42:
Iss.
6, Article 7.
DOI: 10.13652/j.spjx.1003.5788.2025.80499
Available at:
https://www.ifoodmm.cn/journal/vol42/iss6/7
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