The Leaching Rules and Rapid Measurement of Cadmium, Lead and Arsenic in Tea
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Abstract:
In order to clarify the leaching regularity of cadmium (Cd), lead (Pb) and arsenic (As) in tea, and to explore a fast method for measuring these heavy metals, microwave digestion and boiling water leaching was used for pre-treatment. Then the content of Cd, Pb and As in tea water, tea residue and tea was determined by inductively coupled plasma mass spectrometer (ICP-MS), respectively, to explore the leaching rules of these three elements and develop a rapid determination method. The results showed that the content of Cd, Pb and As in tea did not exceed the corresponding national standard of China. Under the extraction conditions in this study, the contents of Cd, Pb and As in tea water soaked 20 minutes all have a linear relationship with those in tea, and the linear equation of Cd, Pb and As is, Y=7.40623X+0.0235 (r=0.9999), Y=5.44998X+0.03008 (r=0.9935), and Y=2.25405X+0.01115 (r=0.9822), respectively. Therefore, the total amount of Cd, Pb and As in tea can be assessed by measuring the content in tea water, fulfilling the rapid measurement of Cd, Pb and As in tea. This study clarified the leaching rules of Cd, Pb and As in tea, and provided a method for rapid pre-treatment and determination of Cd, Pb and As in tea.
