摘要
为了研究土壤高含量重金属和砷在茶叶中的积累与浸出行为,选择贵州省云雾土壤高含量重金属和砷茶园,采集了土壤和茶叶样品各46个,对土壤-茶叶-茶汤系统重金属和砷进行分析。结果表明:云雾茶园土壤重金属Cd、Hg和As均有部分超出土壤二级标准限量值,超标率分别为80.4%、69.6%和8.7%,该茶园土壤存在严重的Cd和Hg污染。但是,茶叶和茶汤的重金属和砷并未超标,茶叶对不同土壤重金属和砷的富集能力为Cu>Cd>Hg>Pb>Cr>As,茶叶-茶汤系统重金属和砷浸出率最高的元素为Hg,不同重金属和砷的浸出率为Hg>As>Cu>Pb>Cd>Cr,Hg和Cu在土壤-茶叶-茶汤系统具有较大富集系数和浸出率。
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.
出处
《食品科学》
EI
CAS
CSCD
北大核心
2013年第8期212-215,共4页
Food Science
基金
贵州省科学技术基金项目(黔科合J字[2010]2127号)
贵州省农业攻关重点项目(黔科合NY字[2009]3021号)
贵州省农业攻关项目(黔科合NY字[2008]3024号)
贵州省社法攻关项目(黔科合SY字[2010]3022号)
关键词
贵州
茶园
土壤
重金属
砷
富集
浸出率
Guizhou
tea garden
soil
heavy metal
As
accumulation
diffusion rate
作者简介
张清海（1982-），男，副研究员，博士研究生，主要从事环境分析技术研究。E-mail：zhqh8@163．com
