[Studies on tea. I. Contents of mercury, lead, and cadmium in tea leaves and tea decoctions (author's transl)].
In a survey on 25 teas from different countries for toxic trace elements the concentration of lead was found to be up to 3.08 ppm. of Cadmium up to 0.012 ppm, and of Mercury up to 3.0 ppm, respectively. The actual concentration in the tea decoction is much lower as in the tea leaves, for lead up to 0.02 ppm and for Cadmium below the sensitivity of the method. It was recommended to set the tolerable values for these elements in the tea leaf higher as recommended for the direct consumed foodstuffs or to consider the final concentration in the tea decoction only.
D002104:Cadmium / Q000032:analysis*; D007854:Lead / Q000032:analysis*; D008628:Mercury / Q000032:analysis*; D013662:Tea / Q000032:analysis* / Q000633:toxicity
D013662:Tea; D002104:Cadmium; D007854:Lead; D008628:Mercury
Untersuchungen über schwarzen Tee. I. Gehalt an Quecksilber, Blei und Cadmium in Teeblättern und Teeaufgüssen