云南省典型茶园重金属元素地球化学特征及风险性评估

谢萌丽; 常河; 周晓华; 杨天福; 龙坤

doi:10.13305/j.cnki.jts.2023.04.004

茶叶科学 >

2023 , Vol. 43 >Issue 4: 501 - 512

DOI: https://doi.org/10.13305/j.cnki.jts.2023.04.004

研究报告

云南省典型茶园重金属元素地球化学特征及风险性评估

谢萌丽 ,
常河 ,
周晓华 ,
杨天福 ,
龙坤

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1.昆明理工大学国土资源工程学院,云南昆明 650093;
2.云南省地质矿产勘查开发局中心实验室（国土资源部昆明矿产资源监督检测中心）,云南昆明 650218

谢萌丽,女,硕士研究生,主要从事农业地质方面的研究,1079460428@qq.com。

收稿日期: 2023-02-13

修回日期: 2023-04-30

网络出版日期: 2023-08-24

基金资助

国家自然科学基金（42167052）、云南省科技厅基金（202101AT070277）、基础研究专项-青年项目（202201AU070091）

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

XIE Mengli ,
CHANG He ,
ZHOU Xiaohua ,
YANG Tianfu ,
LONG Kun

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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 date: 2023-02-13

Revised date: 2023-04-30

Online published: 2023-08-24

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摘要

为探明茶园地质背景与茶叶之间重金属元素含量的关系与现状,以云南省勐库茶园和景迈茶园中的岩石、土壤和茶叶为研究对象,测定10种重金属元素（Hg、Cd、Pb、Co、Cr、Cu、Mn、Ni、Zn、As）的含量,采用多元统计分析和空间分析方法对茶园重金属进行特征总结和风险评价。结果表明：（1）与地壳元素丰度相比,勐库茶园和景迈茶园岩石中的As是富集元素,勐库茶园岩石中的Hg和景迈茶园岩石中Mn元素是贫乏元素;（2）勐库茶园土壤主要以As和Cr污染为主,景迈茶园土壤主要以Cr和Cu污染为主,均为轻度污染,土壤质量良好;（3）茶叶重金属元素的平均含量顺序主要为Mn>Zn>Cu>Ni>Cr,富集能力依次是Mn>Zn>Hg>Cu>Ni,仅有勐库茶园个别茶样As含量超标,茶叶中重金属含量总体处于安全级别;（4）勐库茶园和景迈茶园茶叶中Mn非致癌风险最高,勐库茶园茶叶As致癌风险最高,景迈茶园茶叶Cr致癌风险最高,其余重金属元素处于安全范围内。

关键词： 重金属; 变异系数; 地累积指数; 富集; 健康风险

本文引用格式

谢萌丽 , 常河 , 周晓华 , 杨天福 , 龙坤 . 云南省典型茶园重金属元素地球化学特征及风险性评估[J]. 茶叶科学, 2023 , 43(4) : 501 -512 . DOI: 10.13305/j.cnki.jts.2023.04.004

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

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