Determination and uncertainty evaluation of reference materials for analysis of heavy metal components in Pu-Er tea
With the vigorous development of Yunnan Pu-Er tea industry,the quality control of tea has been paid more and more attention,and the detection of heavy metals in tea is also a focus of atten-tion.In this paper,five heavy metal component reference materials(Cr,Cu,Cd,As,Pb)in six Yunnan Pu'er teas from three places of origin were studied,combined with ten laboratories to carry out calibration,and their uncertainty was evaluated.The reference materials with good homogeneity and sta-bility could be used for the inspection and detection of heavy metal components in the same matrix Pu-Er teas.
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