海南省琼中县土壤—茶树中重金属的迁移特征及饮茶健康风险

doi:10.11720/wtyht.2023.1321

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Abstract

This study sampled the soil and the corresponding roots, stems, and leaves (including large leaves, new leaves, and sprouts) of tea plants from three ecological tea plantations in Qiongzhong County, Hainan Province. Based on these samples, this study investigated the migration of heavy metals in the soil-tea plant system and analyzed the migration patterns of heavy metals and the health risks caused by heavy metals in tea. As indicated by the results, the Pb, Cr, Cd, As, and Hg concentrations in the soil are slightly higher than the background values of corresponding soil elements in Hainan, showing non-significant accumulation. The enrichment of heavy metals varies significantly in different organs of tea plants. Specifically, Cr, Zn, Pb, Hg, and Cd are enriched in roots, while Cu and Ni are enriched in leaves; Pb, Cd, and Hg have higher concentrations in large leaves than in new leaves and sprouts, indicating that these elements are enriched with the growth of leaves; Cu, Ni, and Zn have higher concentrations in sprouts than in leaves, showing that these elements are enriched in the growing parts of leaves. Bio-concentration factors (BCF) indicate that soil physicochemical composition, heavy metal species, and leaf age have effects on the absorption of heavy metals by tea leaves. The results of the risk assessment show that the target hazard quotients (HQ) and hazard indices (HI) of all samples are less than 1, indicating acceptable health risks caused by heavy metals in tea. This study can provide a scientific basis for the prevention and control of heavy metals in tea plantations and has a positive guiding significance for managing tea plantations and ensuring the health of tea consumers.

Key words： soil tea heavy metal plant organ health risk assessment

Received: 20 June 2022 Published: 05 July 2023

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	Qiu-Li GONG
	Jian-Zhou YANG
	Zhen-Liang WANG
	Hui YAN

Cite this article:

Qiu-Li GONG,Jian-Zhou YANG,Zhen-Liang WANG, et al. Migration of heavy metals in the soil-tea plant system and health risks of drinking tea: A case study of Qiongzhong County, Hainan Province[J]. Geophysical and Geochemical Exploration, 2023, 47(3): 826-834.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2023.1321 OR https://www.wutanyuhuatan.com/EN/Y2023/V47/I3/826

The position map of soil and corresponding plant samples in the study area

Analytical methods and corresponding detection limit of analyzed indicators

Basic statistics of heavy metals in soils of the study area

Heavy metals content in different organs of tea trees in the study area

Distribution of heavy metals in young leaves and sprouts of tea

Bioaccumulation factors of the five heavy metals in different organs of tea

Correlation of heavy metal content in new leaves and buds of tea with soil heavy metal, pH and Corg
note: correlations are significant at p < 0.05 (*) or p < 0.01 (**).

Estimated daily intake (EDI) of heavy metal for adults associated with the consumption of infusions of young tea leaves and sprouts from the tea plantations in Qiongzhong Countymg·(kg·d)^-1

The calculated target hazard quotients (HQ) of heavy metals and its proportion caused by drinking tea in the study area

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