To ensure the validity of the measurement results of inductively coupled plasma mass spectrometry (ICP-MS) method for the determination of lead content in Baijiu, a mathematical model of uncertainty was established, the measurement processes were analyzed to determine the sources of uncertainty. Then, each component of uncertainty was calculated and synthesized to evaluate the uncertainty of the whole processes. Results showed that the content of lead (Pb) in Baijiu was 14.949 μg/kg, evaluated as X =(14.949±0.28) μg/kg,k=2. The contribution of standard curve fitting, standard solution preparation and measurement repeatability to the uncertainty of the results were 51.84%, 24.97% and 21.44%, respectively. The fitting degree of the standard curve was the main source of uncertainty.
HAN Mengsha
,
TIAN Jiaxin
,
DU Yingwei
,
WU Jianxia
,
LIN Lin
,
WANG Li
. Evaluation of uncertainty in determination of lead in Baijiu by inductively coupled plasma mass spectrometry[J]. Food and Fermentation Industries, 2021
, 47(6)
: 247
-252
.
DOI: 10.13995/j.cnki.11-1802/ts.025263
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