Journal
ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
Volume 41, Issue 3, Pages 1291-1302Publisher
SPRINGER
DOI: 10.1007/s10653-018-0212-y
Keywords
Tieguanyin tea; Metals; Thallium; Human health risk assessment
Categories
Funding
- National Science Foundation of China [21777049, 41807410]
- Natural Science Foundation of Fujian Province [2016J01065]
- State Key Laboratory of Environmental Geochemistry [SKLEG2016901]
- Fujian Provincial Key Laboratory of Ecology-Toxicological Effects & Control for Emerging Contaminants [PY17003]
- Science and technology project of Quanzhou [2018Z020]
- Key Laboratory of Marine Biogenetic Resources [HY201806]
- National Undergraduate Innovation and Entrepreneurship Training Program [201810399009]
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The metal content of Tieguanyin tea from Anxi, Southeast China, was studied. Leaching experiments were designed based on the local tea-drinking habits, and tea infusions were prepared using three types of water and two methods of soaking tea. Twelve metals (Cd, As, Cr, Pb, Se, Sb, Ag, Tl, Cu, Zn, Be, and Ba) were measured by inductively coupled plasma mass spectrometry (ICP-MS), and a human health risk assessment was performed. The results showed that the quality of water used for steeping tea has a direct effect on the leaching concentrations of metals in the tea infusion and this effect can be reduced by using pure water or commercially available drinking water. Further, the two tea-soaking methods used by local residents can reduce the metal intake. The health risk assessment determined that the carcinogenic risk values of Cr, As, and Pb (Cr > Pb > As) were within an acceptable range (10(-7)-10(-4)); therefore, the concentrations of these metals in tea infusions do not pose substantial carcinogenic risk to tea drinkers. The results also indicate that the high concentrations of Tl in the tea infusions pose a substantial noncarcinogenic risk and may result from the dissolution characteristics of Tl and the water quality.
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