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[Exposure Levels of Lead, Selenium, Arsenic and Mercury in Brick-Teas From Main Producing Areas in China]

[Exposure Levels of Lead, Selenium, Arsenic and Mercury in Brick-Teas From Main Producing Areas in China]

Hairong Li, Ya'nan Guo, Linsheng Yang

Wei Sheng Yan Jiu. 2017 Sep;46(5):733-736.

PMID: 29903299

Abstract:

Objective:
To study the levels of Pb, Se, As and Hg in brick-teas from main producing areas in China and evaluate the safety.
Methods:
A total of 31 samples of brick tea from seven provinces where minority nationalities were accustomed to drinking a large quantity of brick tea were collected, Pb concentrations were determined by inductively coupled plasma-mass spectrometry, and concentrations of As, Se, Hg were detected by hydride generation atomic fluorescence spectrometry. The data were analyzed by SPSS 22. 0 software.
Results:
The average lead levels in brick tea was 6. 232 mg/kg, which exceeded the limit standard of GB 2762-2012. There was a great difference of Pbconcentrations among the various kinds of brick tea producing in different provinces, and the lower Pb concentrations detected in Tuo tea and Puerh tea producing in Yunnan Province, was 1. 337 mg/kg, and the highest determined in Kang brick producing in Sichuan Province, was 9. 998 mg/kg. In addition, the concentrations of As and Hg were all below the limit standard of NY 659-2003. For people accustomed to drinking brick tea for a long term, the average intake amounts of Pb, As, Hg through brick tea contributed 13. 63%, 1. 71% and 0. 29% to dietary Pb, As, Hg of the provisional tolerable weekly intake( PTWI) recommended by Joint FAO/WHO Expert Committee of Food Additives( JECFA) which was in safe range. Otherwise, the daily selenium intake through brick tea was 0. 188 μg, which contributed 0. 38% to the selenium recommended nutrient intake( RNI) by Chinese Nutrition Society.
Conclusion:
Excessive levels of lead in the brick tea is prominent. As, Hg and Se in brick tea are in low exposure level.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AS2121375	Lead Lower Detection Limit Standard			Price
AS2121376	Mercury Lower Detection Limit Standard			Price

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