The contents of Cu,Mg,K and Mn in tea were determined by inductively coupled plasma atomic emission spec-trometry,and the measurement uncertainty was evaluated.The uncertain components was quantified and the combined stan-dard uncertainty and the expanded uncertainty was calculated by the mathematical formula.The results showed that when the confidence level was 95％ ,and the coverage factor was 2,the expanded uncertainty was 0.046 mg/kg when the content of Cu was 4.423 mg/kg;the expanded uncertainty was 0.574 mg/kg when the content of Mg was 1 769 mg/kg;the expanded uncer-tainty was 1.186 mg/kg when the content of K was 45 819 mg/kg;the expanded uncertainty was 0.090 mg/kg when the content of Mn was 638 mg/kg.
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