Distribution of Heavy Metals in Soil and Tea from Yunwu Tea Area in Guizhou Province and Diffusion Characteristics of Heavy Metals in Tea Infusion

doi:10.7506/spkx1002-6630-201308045

Abstract

Abstract: In order to investigate the distribution characteristics of heavy metals in tea, samples of tea and soil were collected in Yunwu tea garden in Guizhou Province. Concentrations of heavy metal in soil, tea and tea liquor were detected. Results showed the heavy contaminations of Cd, Hg and As in soils in Yunwu tea garden, the exceed rates were 80.4%, 69.6% and 8.7% over the national standard of China, respectively. However, contents of heavy metals in tea and tea liquor did not exceed the national standard. The accumulation ability of different heavy metals in tea was Cu ＞ Cd ＞ Hg ＞ Pb ＞ Cr ＞ As. Hg was shown to have the highest diffusion rate in tea infusion followed by As, Cu, Pb, Cd and Cr. Moreover, Hg and Cu had high accumulation abilities in tea and high diffusion rates in tea infusion.

Key words: Guizhou, tea garden, soil, heavy metal, As, accumulation, diffusion rate

CLC Number:

X503.235

ZHANG Qing-hai，LONG Zhang-bo，LIN Shao-xia，ZHU Ping，TAN Hong，LIN Chang-hu. Distribution of Heavy Metals in Soil and Tea from Yunwu Tea Area in Guizhou Province and Diffusion Characteristics of Heavy Metals in Tea Infusion[J]. FOOD SCIENCE, 2013, 34(8): 212-215.

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