Contents and health risks assessment of heavy metals in soil and tea in Leishan, Guizhou Province

doi:10.3969/j.issn.1004-1524.2020.06.13

›› 2020, Vol. 32 ›› Issue (6): 1049-1059.DOI: 10.3969/j.issn.1004-1524.2020.06.13

• Environmental Science • Previous Articles Next Articles

Contents and health risks assessment of heavy metals in soil and tea in Leishan, Guizhou Province

LIU Chunlin¹, ZHANG Jian¹, PENG Yishu², NI Xinran¹, YANG Ruidong^1,*

1. College of Resource and Environmental Engineering, Guizhou University, Guiyang 550025, China;
2. College of Tea Science, Guizhou University, Guiyang 550025, China

Received:2019-10-15 Online:2020-06-25 Published:2020-06-24

Abstract

Abstract: In order to understand the characteristics of heavy metals contents in soil-tea system in the distribution area of Fanzhao and Qingshuijiang in Leishan County, Guizhou Province, and estimate the suitability of tea plantation in the distribution area of metamorphic rocks, tea leaves and corresponding soil samples were collected from 24 tea gardens in Leishan County. Inductively Coupled Plasma (ICP)-Mass Spectrometry (MS) and ICP-Atomic Emission Spectrometer (AES) were used to determine and the contents of 10 heavy metal elements (As, Cd, Co, Cr, Cu, Hg, Ni, Pb, Zn, Mn) in tea leaves and soil. The bioaccumulative characteristics of heavy metals in tea were discussed, and the health risk of model assessment was used to evaluate the carcinogenic risk of drinking tea. It was shown that the average contents of soil heavy metals in the study area were all lower than that of national limitations, while Hg contents exceeded the background value of A-layer soil in Guizhou. The evaluation results of both the geoaccumulation index and the potential ecological risk index indicated that Hg was a main soil pollution factor in Leishan. The heavy metals contents of Leishan tea met the national food safety standards, and Leishan tea possessed potential as Zn-rich tea. The heavy metals contents of both young and mature leaves decreased as Mn>Zn>Cu>Ni>Cr>Co>Cd, and the enrichment capacities of Cu, Zn, Ni and Co in young leaves were stronger than those in mature leaves, while the enrichment capacities of Mn, Pb, Hg, Cd, Cr and As in mature leaves were stronger than those in young leaves. Health risk assessment results indicated that drinking Leishan tea was riskless to human health. But female adults and children should pay attention to Mn when mature leaves were consumed as daily drink.

Key words: Guizhou province, tea garden soil, heavy metal, ecological risk

CLC Number:

S154.4

LIU Chunlin, ZHANG Jian, PENG Yishu, NI Xinran, YANG Ruidong. Contents and health risks assessment of heavy metals in soil and tea in Leishan, Guizhou Province[J]. , 2020, 32(6): 1049-1059.

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Contents and health risks assessment of heavy metals in soil and tea in Leishan, Guizhou Province

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