原子熒光光譜法測定黃金茶中總砷含量的不確定度評定

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Uncertainty Evaluation and Method Improvement of Total Arsenic Content in Golden Tea by Atomic Fluorescence Spectroscopy

TAN Yongsheng1，LIANG Xianchang2， CHEN Yichao1， YANG Qian1， XIANG Yu'， SHI Meilian1，3*

（1.Quality Inspection and Metrology Verification Center of Xiangxi Tujia and Miao Autonomous Prefecture， Jishou

416000， China; 2.Centers for Disease Control and Prevention of Xiangxi Tujia and Miao Autonomous Prefecture， Jishou 416000， China; 3.College of Materials， Xiamen University， Xiamen 361005， China）

Abstract： The content of total arsenic in golden tea was determined using atomic fluorescence spectrometry. According to the JJF1059—2012 and JCGM100：2008，the uncertaintyof the measurement results was evaluated for the detection processByestablishinga mathematical model， the uncertainty components in thequantification were analyzed.Thefactors contributing totheuncertainty，listed indescending orderof magnitude，wereasfollws：sample recovery rate > standard curve fitting > standard solution preparation > repeatability measurement > sample dilution > sample weighing. The expanded uncertainty of the total arsenic content in golden tea was 0.003 2mg?kg-1 （k=2） ， and the measurement result was expressed as （0.0526±0.0032）mgcdotkg-1 .By modifying the sample digestion method，increasing the number of calibration points inthe standard curveand repeated measurements，adjusting the sample weight and dilution volume，the introduction of uncertainty can be effectively reduced，thereby improving detection accuracy.In the testing work，the scientific application of measurement uncertainty evaluation technology plays a crucial role in optimizing detection methods and standardizing operational procedures.This quantitative evaluation approach can significantly enhance the reliability and accuracy of elemental analysis results.

Keywords： atomic fluorescence spectrometry; golden tea; total arsenic; uncertainty; method improvement

湘西州地處武陵山區(qū)，得益于其得天獨厚的氣候條件和深厚的茶文化底蘊，孕育了豐富的黃金茶資源，是中國重要的茶葉產(chǎn)區(qū)之一[。（剩余6365字）