Welcome to Journal of Tea Science,Today is

Journal of Tea Science ›› 2023, Vol. 43 ›› Issue (4): 501-512.doi: 10.13305/j.cnki.jts.2023.04.004

• Research Paper • Previous Articles     Next Articles

Geochemical Characteristics and Risk Assessment of Heavy Metals in Typical Tea Gardens in Yunnan Province

XIE Mengli1, CHANG He1,*, ZHOU Xiaohua2, YANG Tianfu2, LONG Kun1   

  1. 1. Faculty of Land and Resources Engineering, Kunming University of Science and Technology, Kunming 650093, China;
    2. Central Laboratory of Yunnan Geology and Mineral Exploration Development Bureau (Kunming Mineral Monitoring andInspecting Centre of Ministry of Land and Resources), Kunming 650218, China
  • Received:2023-02-13 Revised:2023-04-30 Online:2023-08-15 Published:2023-08-24

Abstract: In order to explore the relationship and the current situation between the geological background of tea garden and the content of heavy metal elements in tea, the rocks, soil and tea in Mengku tea garden and Jingmai tea garden in Yunnan Province were selected as the research objects. The contents of 10 heavy metal elements (Cd, Co, Cr, Cu, Hg, Ni, Pb, Zn, Mn, As) were determined. Multivariate statistical analysis and spatial analysis were used to summarize the characteristics and risk assessment of heavy metals in tea gardens. The results show that: (1) compared with the abundance of elements in the crust, the rocks in Mengku and Jingmai tea gardens were rich in As. While the rocks of Mengku tea garden were poor in Hg and the rocks of Jingmai tea garden were poor in Mn. (2) The soil of Mengku tea garden was mainly polluted by As and Cr. The soil of Jingmai tea garden was mainly polluted by Cr and Cu. They were all lightly polluted and had good soil quality. (3) The average contents of heavy metal elements in tea followed the order of Mn>Zn>Cu>Ni>Cr. The accumulation ability followed the order of Mn>Zn>Hg>Cu>Ni. Only a few tea samples from Mengku tea garden had As content exceeding the standard. And the heavy metal contents in tea were generally at the safe level. (4) For tea samples from Mengku and Jingmai tea gardens, Mn had the highest non-carcinogenic risk. As in Mengku tea had the highest carcinogenic risk. Cr in Jingmai tea had the highest carcinogenic risk. And other heavy metal elements were within the safe range.

Key words: heavy metals, coefficient of variation, geoaccumulation index, enrichment, health risks

CLC Number: